Hydrogen embrittlement in multilayer steel consisting of martensitic and twinning-induced plasticity steels
Publication date: Available online 23 April 2019Source: Materials Science and Engineering: AAuthor(s): S.E. Shin, S.-J. Lee, S. Nambu, T. KosekiAbstractThe hydrogen embrittlement behavior of multilayer steel consisting of 7 alternating layers of martensitic (MART) steel and twinning-induced plasticity (TWIP) steel was investigated through variation in the ratio of the hard layer to the soft layer, and the size of the grains according to the autenization temperature. Multilayer steels with a high fraction of MART was predicted to be vulnerable to hydrogen embrittlement, but was found to be less susceptible to hydrogen embri...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Synthesis of AA2024-(SiO2np+TiO2np) hybrid nanocomposite via stir casting process
In this study, AA2024-(X vol.% SiO2np + Y vol.% TiO2np) (X, Y = 0.5, 1.0) hybrid nanocomposites were fabricated the via stir casting process and their structural and mechanical properties were examined. The results indicated that the grain sizes of the hybrid nanocomposites were reduced by the addition of nanoparticles into the matrix alloy. The analysis of mechanical properties also showed an increase of about 30, 36 and 7% in the hardness, tensile strength, and tensile yield strength, respectively. In the larger amounts of nanoparticles, scanning electron microscopy studies showed that there were more quant...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Superior mechanical properties and deformation mechanisms of heterogeneous laminates under dynamic shear loading
Publication date: Available online 24 April 2019Source: Materials Science and Engineering: AAuthor(s): Jinyan He, Fuping Yuan, Muxin Yang, Sihai Jiao, Xiaolei WuAbstractHigh-strain rate response of low C steel/304 stainless steel (SS) laminates was characterized by hat-shaped specimen using Hopkinson-bar technique at a strain rate of about 7 × 104 s−1. Better dynamic shear properties were observed in the laminates, compared to the plain low C steel plate and the plain 304 SS plate. The laminates were found to postpone the nucleation of adiabatic shear band (ASB) in the hard zone and to delay the propagation...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Microstructure, strain-rate sensitivity, work hardening, and fracture behavior of laser additive manufactured austenitic and martensitic stainless steel structures
Publication date: Available online 24 April 2019Source: Materials Science and Engineering: AAuthor(s): F. Khodabakhshi, M.H. Farshidianfar, A.P. Gerlich, M. Nosko, V. Trembošová, A. KhajepourAbstractThe tensile flow properties of austenitic (S316-L) and martensitic (S410-L) stainless steel wall structures deposited by powder-fed laser additive manufacturing (LAM) process are evaluated. The properties obtained by the LAM process are compared to commercial rolled sheets of these metals. Strain-rate sensitivity, work hardening, and fracture behavior are assessed by conducting uniaxial tensile testing at differen...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

One-step annealing optimizes strength-ductility tradeoff in pearlitic steel wires
Publication date: Available online 24 April 2019Source: Materials Science and Engineering: AAuthor(s): L. Xiang, L.W. Liang, Y.J. Wang, Y. Chen, H.Y. Wang, L.H. DaiAbstractIn this paper, the mechanical properties of a cold-drawn wire (ε=2.43) are modulated by simple annealing and the variation of its microstructure is characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and molecular dynamics (MD) simulation. The tensile ductility of the wire can be improved for about three times without compromising its strength when being annealed at 325 °C for 10–30 min. It is convinced ...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

On the high temperature deformation of a directionally solidified γ-TiAl alloy
Publication date: Available online 24 April 2019Source: Materials Science and Engineering: AAuthor(s): Qiang Wang, Liangcai Zeng, Hongsheng Ding, Ruirun Chen, Jingjie Guo, Hengzhi FuAbstractThe γ-TiAl alloy with a nominal composition of Ti-47Al-2Nb-2Cr-0.2C directionally solidified by electromagnetic cold crucible was isothermally compressed at different temperatures and strain rates. Experimental results revealed that the peak stress decreased with the increased deformation temperature or decreased strain rate. Subgrains were formed in the interior of the lamellae during thermo-compression and the dislocation walls ...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

On the rejuvenation of crept Ni-Base single crystal superalloys (SX) by hot isostatic pressing (HIP)
Publication date: Available online 24 April 2019Source: Materials Science and Engineering: AAuthor(s): O.M. Horst, B. Ruttert, D. Bürger, L. Heep, H. Wang, A. Dlouhý, W. Theisen, G. EggelerAbstractIn the present work, we study the effect of HIP rejuvenation treatments on the creep behavior and residual life of a pre-crept single crystal Ni-base superalloy of type CMSX-4. The present work combines miniature creep experiments of precisely oriented [001] tensile creep specimens with HIP treatments and quantitative analysis of scanning and transmission electron micrographs. A HIP-rejuvenation treatment after 5.0% c...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests
Publication date: Available online 22 April 2019Source: Materials Science and Engineering: AAuthor(s): Domas Birenis, Yuhei Ogawa, Hisao Matsunaga, Osamu Takakuwa, Junichiro Yamabe, Øystein Prytz, Annett ThøgersenAbstractElasto-plastic fracture toughness tests of a commercially pure iron were performed in air and in hydrogen gas at two different pressures. Some unique characteristics of hydrogen-enhanced cracking were exhibited at both the macroscopic and microscopic length scales, based on the observation of fracture surface, fracture plane, plasticity distribution and dislocation structure. The possible mec...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Multilayered Al/Ni energetic structural materials with high energy density and mechanical properties prepared by a facile approach of electrodeposition and hot pressing
Publication date: Available online 22 April 2019Source: Materials Science and Engineering: AAuthor(s): Mingzhi Wang, Liangsheng Qiu, Xingjian Zhao, Yuanzhou Li, Tianheng Rao, Shi He, Liang Qin, Jie TaoAbstractWith an aim to fabricate multilayered Al/Ni energetic structural materials integrating high energy density and mechanical properties, a facile approach of electrodeposition and hot pressing was employed in this study. The effect of hot pressing time on exothermic reactions and mechanical properties has been systematically investigated. It was found that the exothermic heat of Al/Ni energetic structural materials decre...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Strain-based approach to investigate intergranular stress corrosion crack initiation on a smooth surface of austenitic stainless steel
This study investigated stress corrosion cracking (SCC) nucleation in sensitized austenitic stainless steel from the viewpoint of grain boundary (GB) character and strain at a GB where SCC can nucleate. Prior to SCC testing, normal and shear strains were measured on the surface of a specimen subjected to an initial strain of 1% via the digital image correlation (DIC) technique. Then, SCC testing was conducted under a constant load corresponding to the initial strain in a tetrathionate solution. After testing, crystal orientations in the specimen surface were measured by the electron backscattered diffraction (EBSD) techniq...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Microstructural evolution and mechanical behavior of copper processed by low strain amplitude multi-directional forging
Publication date: Available online 22 April 2019Source: Materials Science and Engineering: AAuthor(s): Paula Cibely Alves Flausino, Maria Elisa Landim Nassif, Franco de Castro Bubani, Pedro Henrique R. Pereira, Maria Teresa Paulino Aguilar, Paulo Roberto CetlinAbstractExperiments were performed to analyze the microstructural evolution and mechanical behavior of commercial-purity copper (99.8%) processed by up to 48 cycles of multi-directional forging (MDF) using a low strain amplitude of ∼0.075 (total accumulated strain ε ≈ 10.8). Parabolic work-hardening concomitantly with increasing dislocation dens...
Source: Materials Science and Engineering: A - April 24, 2019 Category: Materials Science Source Type: research

Comparisons of the microstructures and micro-mechanical properties of copper/steel explosive-bonded wave interfaces
Publication date: Available online 21 April 2019Source: Materials Science and Engineering: AAuthor(s): Heng Zhang, Ke Xin Jiao, Jian Liang Zhang, Jianping LiuAbstractThis paper presents a systematic study of the differences in the microstructures and micro-mechanical properties of various Cu/Fe wave interfaces prepared by explosive welding. These wave interfaces, fabricated by different parameters, have been divided into four categories according to variations in their microstructures and the element distribution: vortex region, transition layer, interface without metal bonding, and interface with defects. In the wave inte...
Source: Materials Science and Engineering: A - April 22, 2019 Category: Materials Science Source Type: research

A phenomenological understanding of the influence of processing methods on creep of Cu-8Cr-4Nb (GRCop-84)
Publication date: Available online 21 April 2019Source: Materials Science and Engineering: AAuthor(s): L.G. Vettraino, M. Zhang, J.L.W. Carter, J.R. Groza, J.C. GibelingAbstractSteady-state creep behavior of rolled Cu-8Cr-4Nb (GRCop-84) production sheet was systematically studied at temperatures from 673 to 1073 K (0.50–0.79 Tm). Threshold behavior was observed at high temperatures and low stresses which can be phenomenologically described by a threshold stress model. The threshold stress obtained by a non-linear regression method ranges from 0.2∼0.3 of the Orowan stress, which suggests that dislocations locall...
Source: Materials Science and Engineering: A - April 22, 2019 Category: Materials Science Source Type: research

Effects of different external fields on the microstructure and mechanical properties of novel AlCuLi alloy during twin-roll casting
Publication date: Available online 20 April 2019Source: Materials Science and Engineering: AAuthor(s): Shiju Li, Tao Jiang, Jinyuan Wang, Lizheng Chen, Bowen Wei, Yang Li, Guangming Xu, Zhaodong WangAbstractThe effects of different external fields on the microstructures and properties of twin-roll casting (TRC) 2099 AlLi alloy sheets as well as their mechanism of action were investigated in detail. The serious central segregation of 2099 AlLi alloy cast-rolled sheets is due to the unique properties of TRC process such as the high cooling intensity and the wide solidification range of 2099 alloy. The degree of central segre...
Source: Materials Science and Engineering: A - April 21, 2019 Category: Materials Science Source Type: research

Segregation of Sc and its effects on the strength of Al Σ5 (210) [100] symmetrical tilt grain boundary
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): Zhengbing Xiao, Jiawei Hu, Yu Liu, Fang Dong, Yuanchun HuangAbstractFull investigation has been made into the Sc segregation behavior and its influence on the Al Σ5 (210) [100] symmetrical tilt grain boundary (GB) through systematic first-principles calculations. The preferential sites and sequence for the substitution of Sc for Al in the GB were determined, so were the separation energy and tensile strength of the GB after the addition of Sc. The distribution of charge density and the change in bond lengths were an...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

Strain dependent constitutive model and microstructure evolution of a novel 9Cr martensitic steel during high-temperature deformation
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): Bo Xiao, Lianyong Xu, Lei Zhao, Hongyang Jing, Yongdian Han, Zhengxin TangAbstractThe flow deformation behavior and microstructure evolution of a novel tempered martensite ferritic steel G115 were systematically investigated under temperatures ranging from 625 to 675 °C and stain rates of 5.2 × 10−5–5.2 × 10−3 s−1. The strain dependent constitutive model was established to reflect the flow deformation behavior of G115 steel. The corresponding material constants and the a...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

High-temperature deformation mechanisms and processing maps of equiatomic CoCrFeMnNi high-entropy alloy
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): H.T. Jeong, H.K. Park, K. Park, T.W. Na, W.J. KimAbstractThe hot compressive deformation mechanism and processing maps of the equiatomic FCC CoCrFeMnNi high-entropy alloy (HEA) were studied in the temperature range between 1023 and 1323 K and in the strain rate range between 10−3 and 10 s−1. At high strain rates, strain hardening was dominant even at the very high temperature of 0.84Tm, which may be attributed to the sluggish diffusion coefficient and low stacking fault energy of the CoCrFeMnNi HEA, leading ...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

Study on the microstructure evolution and mechanical properties of an Al-Mg-Li alloy aged by electropulsing assisted ageing processing
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): Han Xiao, Shaosong Jiang, Chengcheng Shi, Kaifeng Zhang, Zhen Lu, Jufu JiangAbstractThe electropulsing assisted ageing (EAA) processing was proposed as a novel energy-saving heat treatment processing for ageing, and how it influenced the microstructure evolution and mechanical properties of an Al-Mg-Li alloy was investigated in this paper. The mechanical properties and deformation behavior of the alloy were closely correlated with the precipitation and coarsening of the δ′ precipitates. Compared with the conve...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

The strain-rate dependence of the Hall-Petch effect in two austenitic stainless steels with different stacking fault energies
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): Sergey V. Astafurov, Galina G. Maier, Evgenii V. Melnikov, Valentina A. Moskvina, Marina Yu. Panchenko, Elena G. AstafurovaAbstractUsing thermal-mechanical treatments, specimens with different grain sizes were produced for two Cr-Ni-based austenitic stainless steels with different stacking fault energies (analogues of AISI 316L and AISI 321 steels). The effect of strain-rate on the tensile deformation behavior and strength properties was evaluated for these steels. In given grain size interval, (3–73)μm for 316 s...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

Influence of inclusions on matrix deformation and fracture behavior based on Gurson–Tvergaard–Needleman damage model
In this study, the required parameters in the Gurson–Tvergaard–Needleman (GTM) damage model were accurately determined via in-situ tensile tests, and then, the parameters were substituted into the Abaqus model to simulate the tensile forming limit of the strip specimen. The final simulation results were in good agreement with the experimental results. On this basis, the effects of the number and distribution of inclusions on the mechanical properties of matrix materials are further analyzed. In this study, the in-situ tensile test method plays an extremely important role. Specifically, it can reveal the metallo...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

Effect of structural stability on the stress induced martensitic transformation in Ti10V2Fe3Al alloy
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): Lichun Qi, Xueliang Qiao, Lijun Huang, Xu Huang, Xinqing ZhaoAbstractStructural stability has a very important effect on the stress induced martensitic transformation in Ti10V2Fe3Al alloy owing to its metastable nature. In the present study, we reported the stress induced martensitic transformation characteristics of Ti10V2Fe3Al specimens with different structural stability endowed by heat treatments. Despite different phase constitutions and morphologies derived by solution treatments in single β phase region and &a...
Source: Materials Science and Engineering: A - April 20, 2019 Category: Materials Science Source Type: research

Ultrasonic spot welding of 5182 aluminum alloy: Evolution of microstructure and mechanical properties
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): S.M.A.K. Mohammed, S.S. Dash, X.Q. Jiang, D.Y. Li, D.L. ChenAbstractThe present study is focused on the evaluation of microstructures, tensile lap shear strength and fatigue resistance of ultrasonic spot welded joints of lightweight AA 5182 aluminum alloy. The temperature quickly increased during ultrasonic spot welding (USW), with the peak temperature increasing with increasing welding energy. A “necklace”-like ultrafine structure occurred at the weld interface due to the presence of dynamic recrystallization...
Source: Materials Science and Engineering: A - April 19, 2019 Category: Materials Science Source Type: research

Microstructures and mechanical property of AlMgScZrMn - A comparison between selective laser melting, spark plasma sintering and cast
Publication date: Available online 19 April 2019Source: Materials Science and Engineering: AAuthor(s): Minbo Wang, Ruidi Li, Tiechui Yuan, Chao Chen, Libo Zhou, Hui Chen, Mei Zhang, Siyao XieAbstractWhether selective laser melting (SLM) printed AlMgScZrMn alloy possesses more excellent performances than other processing routes was unknown. In the study, the microstructures and mechanical properties of AlMgScZrMn alloys fabricated by selective laser melting (SLM), spark plasma sintering (SPS) and cast were comparatively investigated. SLM printed sample shows columnar and equiaxed duplex grains with average grain size about ...
Source: Materials Science and Engineering: A - April 19, 2019 Category: Materials Science Source Type: research

Improved mechanical properties of mild steel via combination of deformation, intercritical annealing, and quench aging
Publication date: Available online 18 April 2019Source: Materials Science and Engineering: AAuthor(s): Sheida Nikkhah, Hamed Mirzadeh, Mehran ZamaniAbstractProcessing of dual phase steel with fine ferrite grains containing nanometric carbides and chain-like morphology of martensite from a 0.035C-0.005N-0.035Si-0.268Mn mild steel was realized via application of high cold rolling reductions, intercritical heat treatment, and room-temperature aging, which showed a yield stress (YS) of 450 MPa and ultimate tensile strength (UTS) of 700 MPa. It was revealed that significant enhancements in tensile properties can be achieved...
Source: Materials Science and Engineering: A - April 18, 2019 Category: Materials Science Source Type: research

Effect of Sc addition on the microstructures and age-hardening behavior of an AlCuMgAg alloy
Publication date: Available online 18 April 2019Source: Materials Science and Engineering: AAuthor(s): Song Bai, Xinlei Yi, Guanhua Liu, Zhiyi Liu, Jian Wang, Juangang ZhaoAbstractThe association between small Sc addition and different precipitates in an AlCuMgAg alloy is investigated in the present work to explain the Sc-dependent microstructural evolution during extended aging at 180 °C. The age-hardening capacity and the strength properties of AlCuMgAg alloy are found to be degraded by 0.32 wt% Sc addition. This negative effect of Sc is directly associated with the formation of Al8Cu4Sc intermetallics, which con...
Source: Materials Science and Engineering: A - April 18, 2019 Category: Materials Science Source Type: research

Effect of equal-channel angular pressing on the precipitation kinetics in Cu-Cr-Hf alloys
Publication date: Available online 18 April 2019Source: Materials Science and Engineering: AAuthor(s): N.R. Bochvar, O.V. Rybalchenko, D.V. Shangina, S.V. DobatkinAbstractAn analysis of phases precipitation during the supersaturated solid solution (SSSS) decomposition in binary Cu–Cr, Cu-Hf and ternary Cu–Cr–Hf alloys after equal-channel angular pressing (ECAP) was carried out. ECAP affects the ageing kinetics by changing the sequence of phase precipitation, and accelerates the decomposition of SSSS. (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - April 18, 2019 Category: Materials Science Source Type: research

Design of novel low-density refractory high entropy alloys for high-temperature applications
Publication date: Available online 14 March 2019Source: Materials Science and Engineering: AAuthor(s): Z.Q. Xu, Z.L. Ma, M. Wang, Y.W. Chen, Y.D. Tan, X.W. ChengAbstractLow-density TiAlVNbMo refractory high-entropy alloys (RHEAs) with a single disordered BCC phase were prepared. Comparing with reported RHEAs and typical Nickel-based superalloys, the novel RHEAs exhibit significantly reduced density (∼6 g/cm3) and possess both high strength and good plasticity at temperatures up to 1000 °C. (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Contribution of Zr to strength and grain refinement in CuCrZr alloy
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Jinshui Chen, Junfeng Wang, Xiangpeng Xiao, Hang Wang, Huiming Chen, Bin YangAbstractThe mechanical properties and microstructure transformation of CuCrZr alloys obtained by upward continuous casting with varying Zr contents were studied by optical microscopy (OM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) after cold drawing with different strain and heat treatment. The results show that good strength can be obtained through cold drawing with suitable heat treatment. The peak ten...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Soft/hard copper/bronze laminates with superior mechanical properties
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Jiansheng Li, Shuaizhuo Wang, Qingzhong Mao, Zhaowen Huang, Yusheng LiAbstractIn current work, various soft/hard copper/bronze laminates with transition interfaces and superior mechanical properties were fabricated by three primary processing steps: diffusion welding, cold rolling and annealing (DCA). The superior combinations of strength and ductility for copper/bronze laminates were mainly attributed to back-stress hardening induced by well-bonded transition interfaces. Back-stress hardening was affected by the microstr...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

On the evaluation of certain strength characteristics and fracture features of iron-based sintered MMCs with nanooxide additives
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Eugene E. Feldshtein, Larisa N. Dyachkova, Grzegorz M. KrólczykAbstractThis paper describes the changes in the mechanical properties and fracture character of ironbased composites with alumina and zirconia nanoadditives. To assess the effect of nanooxide additives one of the design of experiments methods viz the Simplex Lattice Design have been used. It was found that with the introduction of nanooxides, zones of both high and low hardness can be formed depending on their composition. The presence of nanoadditives ...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

The dependence of accumulative roll bonded copper mechanical properties on grain sub-division, stacking faults, and lattice strains
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Ahmed Wagih, Mohamed ShaatAbstractCommercial pure copper was processed at room temperature by accumulative roll bonding (ARB) up to 7 cycles. High-Resolution-Transmission-Electron-Microscope (HRTEM), X-Ray Diffraction (XRD) analyses, tensile and hardness measurements were carried out to interpret the interplay between lattice strain, stacking faults, microstructure evolution and mechanical properties of pure copper during ARB. ARBed Cu was obtained with 27 nm crystallite size achieving 351%, 137%, and 159% enhancements ...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Combining surface mechanical attrition treatment with friction stir processing to optimize the mechanical properties of a magnesium alloy
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Zhen Zhang, Yaozu Li, Jinhua Peng, Peng Guo, Ji'an Huang, Pengju Yang, Shan Wang, Chang Chen, Wei Zhou, Yucheng WuAbstractFriction stir processing (FSP) and surface mechanical attrition treatment (SMAT) were performed on an AZ31 magnesium alloy to improve the mechanical properties. The microstructure, macro-texture, as well as mechanical properties were investigated by optical microscopy, transmission electron microscopy, X-ray diffractometer and uniaxial tensile tests respectively. FSP significantly refined the initial g...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Influence of pre-tempering treatment on microstructure and mechanical properties in quenching and partitioning steels with ferrite-martensite start structure
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Fei Peng, Yunbo Xu, DingTing Han, Xingli Gu, Jiayu Li, Xu WangAbstractThe low carbon micro-alloyed steel with start microstructure of ferrite-martensite was pre-tempered to be ferrite-tempered martensite microstructure before cold rolling. Then an identical quenching and partitioning process was applied to the cold rolled sheet with start microstructures of deformed ferrite-martensite (Q&P-UFC) and deformed ferrite-tempered martensite (Q&P-T). It revealed that the austenitization of Q&P-T was retarded and much...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Individual phase deformation and flow correlation to macroscopic constitutive properties of DP1180 steel
Publication date: Available online 17 April 2019Source: Materials Science and Engineering: AAuthor(s): Raheleh M. Rahimi, David F. BahrAbstractDual phase (DP) steels are broadly deployed by the automotive industry to enhance strength and ductility for light weighting. As DPs micro-constituents’ grain size is frequently on the same order of sizes probed with nanoindentation, an inverse technique was combined with nanoindentation load-depth curves to extract the stress-strain behavior of ferrite and martensite in DP1180. Determining the appropriate depth to evaluate the properties of the micro-constituent phases enable...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Selective laser melting of Mg-Zn binary alloys: Effects of Zn content on densification behavior, microstructure, and mechanical property
Publication date: Available online 17 April 2019Source: Materials Science and Engineering: AAuthor(s): Kaiwen Wei, Xiaoyan Zeng, Zemin Wang, Jinfeng Deng, Mengna Liu, Gao Huang, Xiaochi YuanAbstractMg-Zn binary alloys with seven distinctive compositions (Zn (wt.%) = 1, 2, 4, 6, 8, 10 and 12) were prepared using a selective laser melting (SLM) additive manufacturing technology. Densification behaviors and microstructure of the SLM-processed alloys were analyzed using quantitative metallography analysis, XRD, SEM, and EDS. The mechanical property characterizations were carried out through microhardness and uniaxial tensi...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Nano-indentation and in-situ investigations of double-sided laser beam welded 2060-T8/2099-T83 Al-Li alloys T-joints
Publication date: Available online 17 April 2019Source: Materials Science and Engineering: AAuthor(s): Xi Chen, Zhenglong Lei, Yanbin Chen, Bing Han, Meng Jiang, Ze Tian, Jiang Bi, Sanbao LinAbstract2060 and 2099 are both newly developed high-strength aluminum-lithium (Al-Li) alloys for fuselage panels of jetliners. In this work, double-sided laser beam welding of 2-mm-thick 2060-T8 and 2099-T83 Al-Li alloys was performed using AA4047 filler wire under optimized parameters. Weld zone microstructure and T-joint mechanical properties were investigated by means of scanning electron microscopy (SEM), electron backscattered dif...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Dynamic deformation and failure process of quasi-closed-cell aluminum foam manufactured by direct foaming technique
In this study, the split-Hopkinson pressure bar technique with high speed video camera was used to directly observe the dynamic deformation in quasi-closed-cell aluminum foam fabricated by an in-house direct foaming methodology. The characterization of cellular structure was first performed on the developed aluminum foam, indicating that the cell size follows a log-normal distribution. The measurements revealed that the deformation mode varies with the strain rate. After that an experimentally validated X-ray micro-computed tomography based 3D finite element model of the as-fabricated specimen was established to predict th...
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Corrigendum to “Location dependence of microstructure, phase transformation temperature and mechanical properties on Ni-rich NiTi alloy fabricated by wire arc additive manufacturing”. [Mater. Sci. Eng. A 749 (2019) 218–222]
Publication date: 22 May 2019Source: Materials Science and Engineering: A, Volume 756Author(s): Jun Wang, Zengxi Pan, Guangsai Yang, Jian Han, Xizhang Chen, Huijun Li (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - April 17, 2019 Category: Materials Science Source Type: research

Enhanced room temperature stretch formability of AZ31B magnesium alloy sheet by laser shock peening
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Bo Mao, Bin Li, Dong Lin, Yiliang LiaoAbstractLaser shock peening (LSP) experiments were conducted on an AZ31B Mg alloy sheet. The results show that the room-temperature stretch formability of Mg alloy sheet can be enhanced by LSP, particularly through an integrated texture weakening and grain refinement effect induced by the laser shock loading. (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - April 16, 2019 Category: Materials Science Source Type: research

A cooperative nano-grain rotation and grain-boundary migration mechanism for enhanced dislocation emission and tensile ductility in nanocrystalline materials
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Chunhui Liu, Wenjun Lu, George J. Weng, Jianjun LiAbstractExtensive experiments and molecular dynamics simulations have shown that stress-driven grain growth can greatly contribute to enhanced dislocation emission and tensile ductility in nanocrystalline metals. However, the underlying mechanism behind this correlation remains unclear. In this work a theoretical model based on the cooperative nano-grain rotation and grain-boundary migration for grain growth is proposed to explain the enhanced dislocation emission from gra...
Source: Materials Science and Engineering: A - April 16, 2019 Category: Materials Science Source Type: research

Microstructure, mechanical properties, and thermal stability of lean, copper-free silver alloy subjected to equal channel angular pressing (ECAP) and subsequent post-processing
Publication date: Available online 16 April 2019Source: Materials Science and Engineering: AAuthor(s): Maciej Krystian, Jelena Horky, Damien Colas, Stefano Neodo, Frédéric DiologentAbstractVarious paths of equal channel angular pressing (ECAP) and conventional post-deformation via forging and rolling were performed to improve the mechanical properties (particularly, the strength and hardness) of a copper-free silver alloy. The microstructure was investigated with optical and scanning electron microscopy. The primary grain size of approximately 130 μm was significantly refined to ultrafine-grained (UFG...
Source: Materials Science and Engineering: A - April 16, 2019 Category: Materials Science Source Type: research

Formation of Ti2AlN and TiB and its effect on mechanical properties of Ti46Al4Nb1Mo alloy by adding BN particles
Publication date: Available online 15 April 2019Source: Materials Science and Engineering: AAuthor(s): Yingmei Tan, Ruirun Chen, Yangli Liu, Hongsheng Ding, Yanqing Su, Jingjie Guo, Hengzhi FuAbstractThe synergistic effects of B and N on the microstructure evolution, mechanical properties and fracture behavior of Ti46Al4Nb1Mo alloy were investigated by adding BN particles. Ti46Al4Nb1Mo-xB-xN (x = 0, 0.4%, 0.8%, 1.2%, 1.6%, atomic percent, hereafter in at.%) alloys were prepared by vacuum arc melting. Compared with Ti46Al4Nb1Mo alloy, B2 phase disappeared and curvy TiB phase appeared at the interdendritic region in Ti46...
Source: Materials Science and Engineering: A - April 15, 2019 Category: Materials Science Source Type: research

Creation of heterogeneous microstructures in copper using high-pressure torsion to enhance mechanical properties
Publication date: Available online 15 April 2019Source: Materials Science and Engineering: AAuthor(s): Maryam Jamalian, Mehdi Hamid, Natalia De Vincentis, Quentin Buck, David P. Field, Hussein M. ZbibAbstractThis paper studies the effects of high-pressure torsion (HPT) at ambient temperature on microstructural evolution and mechanical properties enhancement in pure copper. The aim is to introduce gradient microstructure, with various statistical distributions of grain size and grain orientations to examine their effect on strength and ductility. To this end, extruded cylindrical pure copper subjected to HPT for 1, 2, and 3...
Source: Materials Science and Engineering: A - April 15, 2019 Category: Materials Science Source Type: research

Microstructural evolution and growth kinetics of interfacial compounds in TiAl/Ti3SiC2 diffusion bonding joints
Publication date: Available online 13 April 2019Source: Materials Science and Engineering: AAuthor(s): Qi Wang, Guo-qing Chen, Kang Wang, Xue-song Fu, Wen-long ZhouAbstractTiAl intermetallic was direct diffusion bonded to Ti3SiC2 at 900 °C, 950 °C, and 1000 °C with a holding time ranging from 0.25 h to 64 h. The interfacial microstructural evolution, the growth kinetics and the mechanical properties of the bonded TiAl/Ti3SiC2 joints were systematically investigated. The build-up of interfacial compounds in the TiAl/Ti3SiC2 joints changed from γ+α2/γ/Ti5Si3/Ti3SiC2 to γ+α2...
Source: Materials Science and Engineering: A - April 15, 2019 Category: Materials Science Source Type: research

Low cycle fatigue behaviour of a ferritic steel strengthened with nano-meter sized precipitates
Publication date: Available online 14 April 2019Source: Materials Science and Engineering: AAuthor(s): S. Majumdar, A.D. Gandhi, M.S. BishtAbstractLow-cycle-fatigue behaviour (Δεt/2 = ± 0.002 to ± 0.01) of a ferritic-steel (tensile strength ∼ 800 MPa) strengthened with nano-meter-sized-precipitates has been examined. The selected steel is a hot-rolled Ti-Mo-bearing low-carbon steel (grain size ∼ 3 μm) strengthened predominantly with Ti-Mo-C and Ti-C type precipitates of size ≤ 30 nm distributed randomly on the grain-boundaries and the matrix.The spread of cy...
Source: Materials Science and Engineering: A - April 15, 2019 Category: Materials Science Source Type: research

Effect of hot deformation parameters on flow stress and microstructure in a low carbon microalloyed steel
Publication date: Available online 10 April 2019Source: Materials Science and Engineering: AAuthor(s): Liangyun Lan, Wei Zhou, R.D.K. MisraAbstractHot deformation behavior of low carbon microalloyed steel was investigated by single-pass compression tests using a thermomechanical simulator. After the specimens were subjected to different hot deformation processes, their microstructures were obtained by constant cooling rate and then examined using optical microscopy and electron backscattering diffraction (EBSD) technique. The results showed that the absence of stress peak in the flow stress curves does not necessarily indi...
Source: Materials Science and Engineering: A - April 13, 2019 Category: Materials Science Source Type: research

Modelling strengthening mechanisms in beta-type Ti alloys
Publication date: Available online 11 April 2019Source: Materials Science and Engineering: AAuthor(s): G.-H. Zhao, X.Z. Liang, B. Kim, P.E.J. Rivera-Díaz-del-CastilloAbstractAn integral modelling approach for understanding the strengthening mechanisms in Ti alloys is presented and applied to alloys undergoing deformation via dislocation slip. The model incorporates contributions from solid-solution, grain boundary, dislocation forest and strain hardening. The metal forming and thermomechanical processing factors influence both grain size and the stored strain energy. The strain hardening of Ti-Fe-Sn-Nb alloys was mo...
Source: Materials Science and Engineering: A - April 13, 2019 Category: Materials Science Source Type: research

Effects of Zr and Si addition on high-temperature mechanical properties and microstructure in Ti-10Al-2Nb-based alloys
Publication date: Available online 11 April 2019Source: Materials Science and Engineering: AAuthor(s): Kei Shimagami, Tsutomu Ito, Yoshiaki Toda, Atsushi Yumoto, Yoko Yamabe-MitaraiAbstractThe solid-solution strengthening effect for the single and simultaneous addition of Zr and Si on the compression strength and the creep property in Ti-10Al-2Nb based alloys (at%) with an equiaxed α phase designed by us, was investigated. The compression strengths of these alloys were investigated at temperatures between room temperature and 650 °C. The largest solid-solution strengthening effect was obtained for the alloys wi...
Source: Materials Science and Engineering: A - April 13, 2019 Category: Materials Science Source Type: research

Creep residual life prediction of a nickel-based single crystal superalloy based on microstructure evolution
In this study, creep tests of a nickel-based single crystal superalloy in the [001] orientation at 980 °C and 1100 °C were performed. The results indicated that creep failure occurred due to the formation of micropores and deterioration. Scanning electron microscopy (SEM) observations showed that the material degradation during creep was primarily reflected in the coarsening of the matrix channel and the precipitation of the TCP phase. Meanwhile, transmission electron microscopy (TEM) observations indicated that the dislocation morphology of the [001] orientation is consistent with the characteristics of the oc...
Source: Materials Science and Engineering: A - April 13, 2019 Category: Materials Science Source Type: research

Ductility-dip cracking susceptibility in dissimilar weld metals of alloy 690 filler metal and low alloy steel
Publication date: Available online 11 April 2019Source: Materials Science and Engineering: AAuthor(s): Kota Kadoi, Makoto Hiraoka, Kenji Shinozaki, Takeshi ObanaAbstractThe effect of dilution ratio and chemical composition on the ductility-dip cracking (DDC) susceptibility of dissimilar overlay welds of Alloy 690 filler wire and low alloy steel (LAS) was investigated. We measured the hot ductility curve using a hot tensile test coupled with an in-situ measurement system. The minimum critical strain of Alloy 690 was 4.0% at 943 °C. The minimum strain and the temperature decreased with increasing LAS content from 3.2% ...
Source: Materials Science and Engineering: A - April 13, 2019 Category: Materials Science Source Type: research