Revealing the maximum microhardness and thickness of hardened layers for copper with various grain sizes
Publication date: Available online 15 February 2020Source: Materials Science and Engineering: AAuthor(s): C.X. Ren, Q. Wang, J.P. Hou, Z.J. Zhang, H.J. Yang, Z.F. ZhangAbstractSurface strengthened Cu samples with ultra-fine grain (UFG), fine grain (FG), and coarse grain (CG) matrixes were prepared by cold-rolling, controlled annealing, and then treated by surface spinning strengthening (3S) to reveal the effect of grain size on the feature of the hardened layer. The results indicate that the maximum microhardness of the hardened layer was slightly affected by grain size. The thickness of the hardened layer is significantly...
Source: Materials Science and Engineering: A - February 16, 2020 Category: Materials Science Source Type: research

Effect of Cr additions on a γ-γ’ microstructure and creep behavior of a Co-based superalloy with low W content
Publication date: Available online 14 February 2020Source: Materials Science and Engineering: AAuthor(s): Daniel S. Ng, Ding-Wen Chung, Jacques P. Toinin, David N. Seidman, David C. Dunand, Eric A. LassAbstractNickel- and cobalt-based superalloys derive their excellent oxidation and corrosion resistance from the surface oxidation of Al and Cr, which form protective oxide layers. Starting from an existing Cr-free cobalt-based superalloy (Co–30Ni–7Al–4Ti–3Mo–2W–1Nb–1Ta-0.1B at. %) with a γ-γ′ microstructure, we create three alloys with 4, 8 and 12 at. % Cr additio...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

On the relationship between internal porosity and the tensile ductility of aluminium alloy die-castings
Publication date: Available online 14 February 2020Source: Materials Science and Engineering: AAuthor(s): Ewan Lordan, Jaime Lazaro-Nebreda, Yijie Zhang, Kun Dou, Paul Blake, Zhongyun FanAbstractThis paper describes the application of X-ray tomography to predict the tensile fracture properties of aluminium alloy die-castings containing natural casting defects. A new estimator (Z-project) is presented that can predict the areal fraction of porosity involved during tensile failure to a higher degree of accuracy than conventional methods, which are also discussed. By coupling the proposed estimator with an existing model for ...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Static softening behavior and modeling of an Al–Cu–Mg–Zr alloy with various pre-precipitation microstructures during multistage hot deformation
Publication date: Available online 15 February 2020Source: Materials Science and Engineering: AAuthor(s): Guowei Bo, Fulin Jiang, Huaguang Su, Luoyi Wu, Jie Teng, Dingfa Fu, Hui ZhangAbstractThe complex precipitates have been found to work on the hot workability of heat treatable Al alloys considerably. In this work, to include the functions of interrupted holding following multistage hot working, double-stage hot compression tests were performed on an Al–Cu–Mg–Zr alloy with different pre-precipitation microstructures which were tailored through air cooling, water quenching and furnace cooling after solut...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Mechanical property development of a 0.15C–6Mn–2Al–1Si third-generation advanced high strength steel using continuous galvanizing heat treatments
Publication date: Available online 15 February 2020Source: Materials Science and Engineering: AAuthor(s): Daniella M. Pallisco, Joseph R. McDermidAbstractThe effects of starting microstructure and intercritical annealing (IA) temperature on the mechanical properties of a prototype 0.15C–6Mn-1.5Al–1Si (wt%) third-generation medium manganese advanced high strength steel (3G AHSS) were determined. The general 3G AHSS mechanical property targets UTS × TE of 24,000–40,000 MPa% were met after a continuous galvanizing line (CGL)-compatible IA treatments at 710 °C and 740 °C for 120 s fr...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Contrasting roles of Laves_Cr2Nb precipitates on the creep properties of novel CuCrNbZr alloys
Publication date: Available online 15 February 2020Source: Materials Science and Engineering: AAuthor(s): Ling Wang, Ce Zheng, Boopathy Kombaiah, Lizhen Tan, David J. Sprouster, Lance L. Snead, Steven J. Zinkle, Ying YangAbstractTo enhance the creep resistance at elevated temperatures, a new precipitation-strengthened CuCrNbZr alloy has been designed and fabricated to achieve a target microstructure with coarse Laves_Cr2Nb precipitates at grain boundaries and fine Cr-rich precipitates in the matrix. This work systematically studied the creep property of the CuCrNbZr alloy at 500 °C under 90–140 MPa applied st...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Tensile properties, strain rate sensitivity and failure mechanism of single crystal superalloys CMSX-4
The objective of this study is to identify the strain rate sensitivity and understand the damage failure mechanism by checking stress-strain curves and microstructure of the deformed sample. Experimental results show that the stress-strain curves including strain hardening behavior at both strain rates are different. The size of cleavage facets and dimples in the tensile fracture surface is related to the strain rates. The shearing lines cross through the γ matrix and γ' precipitates, which is related to the movement of dislocations. Then, Schmid factor and the damage failure mechanism during tensile tests are ...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Characterization of plastic deformation induced by machining in a Ni-based superalloy
Publication date: Available online 13 February 2020Source: Materials Science and Engineering: AAuthor(s): Rengen Ding, Craig Knaggs, Hangyue Li, Yue Gang Li, Paul BowenAbstractThe surface integrity characteristics of Udimet 720Li subjected to slight damage and damage machining conditions have been studied using a complementary range of techniques such as FIB-SEM, EBSD, TKD, TEM-EDS and nano-indentation. The results indicate the existence of nano-sized grains and no observable tertiary γ′ in regions of severe plastic deformation in the machined surface. The correlation between the machining condition and the res...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Process-induced geometric defect sensitivity of Ti–6Al–4V lattice structures with different mesoscopic topologies fabricated by electron beam melting
Publication date: Available online 13 February 2020Source: Materials Science and Engineering: AAuthor(s): Lijun Xiao, Shi Li, Weidong Song, Xiao Xu, Shiqiao GaoAbstractTi–6Al–4V lattice structures with different cell configurations are fabricated by electron beam melting (EBM) method. Two different cell topologies (octet truss and regular rhombic dodecahedron lattice) corresponding to stretching-dominated and bending-dominated respectively are taken into consideration. The mechanical properties of these specimens are examined by quasi-static compression experiments which are conducted by electronic universal ma...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Effect of the oxygen content of the powder on the selective electron beam melting of pure copper
Publication date: Available online 13 February 2020Source: Materials Science and Engineering: AAuthor(s): Ralf Guschlbauer, Alex K. Burkhardt, Zongwen Fu, Carolin KörnerAbstractAdditive Manufacturing using Selective Electron Beam Melting is attractive to fabricate pure copper components due to the specific properties of the electron beam. In this contribution, two different copper powder batches with different oxygen levels are processed. The samples produced using the powder with high oxygen level show cracks, whereas samples from the powder with low oxygen content are crack-free. The mechanical properties of the cra...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Microstructural evolution and mechanical characterization of Nb-interlayer-inserted Ti–6Al–4V/Si3N4 joints brazed with AuNiTi filler
Publication date: Available online 13 February 2020Source: Materials Science and Engineering: AAuthor(s): Fei Shen Ong, Hirobumi Tobe, Go Fujii, Eiichi SatoAbstractThe interfacial microstructure evolution and mechanical behavior of Ti–6Al–4V/Si3N4 joints with insertion of a 2 mm-thick Nb interlayer were studied by brazing with Au96.5Ni3Ti0.5 (mass%) alloy as a heat- and corrosion-resistant filler. When the joints were brazed at 1323 K with holding times of 0, 5, and 10 min, multilayered Au4Ti, Au2Ti, AuTi, AuTi3, and Au2Nb3 intermetallic compounds were formed at the Ti–6Al–4V/Nb interface, whe...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

Basal shearing of twinned stacking faults and its effect on mechanical properties in an Mg–Zn–Y alloy with LPSO phase
Publication date: Available online 14 February 2020Source: Materials Science and Engineering: AAuthor(s): X.H. Shao, Q.Q. Jin, Y.T. Zhou, H.J. Yang, S.J. Zheng, B. Zhang, Q. Chen, X.L. MaAbstractThe precipitates inside deformation twins may block the dislocation motion and consequently affect the mechanical property of materials. Herein, at the atomic level, we directly visualize that the basal dislocation slips shear the twinned stacking faults (TSFs) within the deformation twins in an Mg–Zn–Y alloy containing long-period stacking ordered (LPSO) structures. The TSFs, enriched with solute atoms, could be consid...
Source: Materials Science and Engineering: A - February 15, 2020 Category: Materials Science Source Type: research

A modified constitutive model of Ag nanoparticle-modified graphene/Sn–Ag–Cu/Cu solder joints
In this study, Sn–Ag–Cu solder alloys and Sn–Ag–Cu solder alloys reinforced with 0.1 wt% Ag-graphene nanosheets (Ag-GNSs) by mechanical mixing (H for abbreviation) and ball milling (Q for abbreviation), which were referred as SAC, H/0.1Ag-GNSs, and Q/0.1Ag-GNSs, respectively, were used to form solder joints. The creep behavior of the above solder joints was investigated by conducting nanoindentation tests. A method for calculating the strengthening stress generated by the load transfer and orientation of the Ag-graphene nanosheets was proposed. The method considers the geometry and grain data of t...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Effect of carbon content on selection of slip system during uniaxial tensile deformation of lath martensite
Publication date: Available online 11 February 2020Source: Materials Science and Engineering: AAuthor(s): K.H. Ryou, S. Nambu, T. KosekiAbstractThe deformation behavior of lath martensite in medium-carbon steel was investigated using a scanning electron microscope and electron backscattering diffraction techniques and compared with that of low-carbon steel. There was a significant difference in the occurrence behavior of slip bands between the two grades of steel. In particular, the slip band occurrence is concentrated on specific type in the case of medium-carbon steel. About the origin of this particular phenomenon, it i...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Development of thermal plastic forming process for Ti35Zr15Ni35Cu15 metallic glass exhibiting superelasticity after crystallization
Publication date: Available online 11 February 2020Source: Materials Science and Engineering: AAuthor(s): Yong Joo Kim, Youn Jae Choi, Woo Chul Kim, Jeong Soo Kim, Won Tae Kim, Do Hyang KimAbstractIn order to enhance the TPF ability of Ti35Zr15Ni35Cu15 metallic glass alloy exhibiting superelasticity after crystallization into the single B2 phase, newly developed “heating TPF process” has been introduced as compared to the conventional “isothermal TPF process”. The result shows that both the surface hologram pattern and superelasticity can be obtained by a one-step heating TPF process under a reasona...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

On the long-term correlations in the twinning and dislocation slip dynamics
Publication date: Available online 11 February 2020Source: Materials Science and Engineering: AAuthor(s): E. Agletdinov, D. Drozdenko, P. Harcuba, P. Dobron, D. Merson, A. VinogradovAbstractThe present work aims at gaining new insights into the dynamics of the dislocation slip and twinning processes, which govern the majority of possible scenarios of plastic deformation in structural metals and alloys. Using model magnesium single crystals and employing the statistical analysis of acoustic emissions (AE) generated in the course of plastic deformation, it was demonstrated that twinning is a process with a memory of the past...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Stress rupture properties and deformation mechanisms of Nimonic 105 alloy at intermediate temperature
Publication date: Available online 11 February 2020Source: Materials Science and Engineering: AAuthor(s): Tao Peng, Bin Yang, Gang Yang, Lu Wang, Zhihua GongAbstractThe microstructural evolution, stress rupture properties and deformation mechanisms of Nimonic 105 alloy at 800 °C within stress range of 350-200 MPa were investigated through a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and stress rupture tests. It is found that the rupture time of the alloy increased from 201 to 9591 h as the stress decreased from 350 to 200 MPa at 800 °C. During the stress ru...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Acoustic emission analysis during fatigue crack propagation by Bayesian statistical modeling
Publication date: Available online 10 February 2020Source: Materials Science and Engineering: AAuthor(s): Takayuki Shiraiwa, Hiroyuki Takahashi, Manabu EnokiAbstractAcoustic emission (AE) during fatigue crack growth of pure iron, three carbon steels and two Mg–Y–Zn alloys were measured and analyzed using Bayesian approaches to classify the fatigue crack growth process into several stages. By formulating the relationship between fatigue crack growth rate and AE parameters with a multiple-changepoint model and applying the experimental data to Markov chain Monte Carlo (MCMC) analysis, the fatigue crack growth pro...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Microstructures and properties of a novel carburizing nanobainitic bearing steel
Publication date: Available online 10 February 2020Source: Materials Science and Engineering: AAuthor(s): Yanhui Wang, Zhinan Yang, Fucheng Zhang, Yuman Qin, Xubiao Wang, Bo LvAbstractNanobainite and dispersed carbides were gained on the surface layer of a modified carburizing 23Cr2Ni2Si1Mo bainitic bearing steel based on carburization, tempering at high temperature, and succedent low-temperature isothermal quenching. As compared with the conventional carburizing 20Cr2Ni4 martensitic bearing steel, the novel carburizing 23Cr2Ni2Si1Mo nanobainitic bearing steel showed a much higher wear-resisting performance and rolling con...
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Improving performance of friction stir welded AZ31/AM60 dissimilar joint by adjusting texture distribution and microstructure
This study provided some insights in understanding the improvement of the dissimilar FSW Mg joint performance by controlling texture distribution and microstructure. (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - February 12, 2020 Category: Materials Science Source Type: research

Microstructure, mechanical properties and creep behaviour of extruded Zn-xLi (x = 0.1, 0.3 and 0.4) alloys for biodegradable vascular stent applications
Publication date: Available online 9 February 2020Source: Materials Science and Engineering: AAuthor(s): Suming Zhu, Chengcheng Wu, Guannan Li, Yufeng Zheng, Jian-Feng NieAbstractZn–Li alloys have been shown to be promising for biodegradable vascular stent applications due to their favourable biocompatibility and superior strength. This work presents a thorough evaluation of the microstructure, room temperature mechanical properties and human body temperature creep behaviour of hot-extruded Zn-xLi (x = 0.1, 0.3 and 0.4) alloys. All alloys show typical basal texture after the extrusion but the recrystallized grain...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Optimization of process parameters using the Grey-Taguchi method and experimental validation in TRIP-assisted steel
Publication date: Available online 10 February 2020Source: Materials Science and Engineering: AAuthor(s): Chenghao Song, Haoliang Wang, Zhenzhong Sun, Zhengying Wei, Hao Yu, Haibin Chen, Yanlin WangAbstractIntercritical annealing, quenching, and partitioning (I&Q&P) parameters of transformation-induced plasticity (TRIP)-assisted steel were optimized using the Grey-Taguchi method. The optimum combination of mechanical properties was achieved after nine sets of experiments based on an orthogonal array. The influence of each factor was investigated based on the grey relational analysis, and the results indicated that ...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

A novel technique to form gradient microstructure in AA5052 alloy
In this study, the recovery of strain hardening rate (RSHR) observed for the first time in the AA5052 alloy after the third, fourth, and fifth passes resulting in a good combination of strength and ductility. The fracture surfaces indicated that as the distance from the surface increased, the dimple depth in the fracture surface gradually increased. On the other hand, with increasing the number of passes, the size of dimples decreased owing to the formation of more recrystallized fine grains at the higher number of passes. (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Corrigendum to “The influence of impurities on the ductility and toughness of a low-temperature-aged U–Nb alloy” [Mater. Sci. Eng. A. 739 (2019) 1-16]
Publication date: 10 March 2020Source: Materials Science and Engineering: A, Volume 777Author(s): Dong Chen, Xinjian Zhang, Haoxi Wu, Dingmu Lang, Dawu Xiao, Zhenhong Wang, Bin Su, Daqiao Meng (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Processing, multiscale microstructure refinement and mechanical property enhancement of hypoeutectic Al–Si alloys via in situ bimodal-sized TiB2 particles
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): Qiang Li, Feng Qiu, Bai-Xin Dong, Xiang Gao, Shi-Li Shu, Hong-Yu Yang, Qi-Chuan JiangAbstractA comprehensive investigation of the trace additions of in situ novel bimodal-sized (nano and submicron) TiB2 particles on the solidification behavior, microstructure and mechanical property evolution of Al–7Si–4Cu alloys were carried out through remelting and dilution-assisted ultrasonic vibration. The results showed that both the primary α-Al dendrites and eutectic Si structure were greatly refined in the pre...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Effects of the addition of silicon to 7075 aluminum alloy on microstructure, mechanical properties, and selective laser melting processability
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): Yuki Otani, Shinya SasakiAbstractAluminum alloys that can be processed using the selective laser melting (SLM) technique have been restricted to cast alloys based on the Al–Si binary system. To increase the selection of materials available for SLM, researches on SLM processability using wrought Al alloys (e.g. 2xxx, 7xxx series) have been conducted. The 7075 Al alloy has excellent mechanical properties among aluminum alloys; however, 7075 alloy has the problem of severe cracking occurring in parts fabricated throu...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Similar and dissimilar welds of ultrafine grained aluminium obtained by friction stir welding
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): Marta Orłowska, Tomasz Brynk, Andreas Hütter, Jacek Goliński, Norbert Enzinger, Lech Olejnik, Małgorzata LewandowskaAbstractSamples from commercially pure aluminium were subjected to various number of passes of Incremental Equal Channel Angular Pressing (I-ECAP) and subsequently welded using Friction Stir Welding (FSW). Similar and dissimilar welds were obtained and investigated in terms of their microstructure and mechanical properties. In the case of similar weld from coarse grained aluminium in the stir zone ...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Individual/synergistic effects of Al and AlN on the microstructural evolution and creep resistance of Elektron21 alloy
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): Hong Yang, Daniela Zander, Yuanding Huang, Karl Ulrich Kainer, Hajo DieringaAbstractThe creep properties of Mg-2.85Nd-0.92Gd-0.41Zr-0.29Zn (El21) alloys with additions of 0.25 wt% Al, 0.75 wt% AlN and 1 wt% AlN/Al nanoparticles (NPs) were studied over a stress range from 80 to 140 MPa at 240 °C, respectively. The individual/synergistic roles of Al and AlN in the El21 alloy were investigated systematically to reveal their creep strengthening mechanisms. Creep results show that individually all three addit...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

The significant effect of non-recrystallization zone reduction on microstructure and mechanical properties in multi-phase steel from the perspective of crystallographic structure and variant pairing
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): M.Y. Sun, Z.Q. Wang, X.M. Wang, C.J. Shang, R.D.K. MisraAbstractWe elucidate here the significant effect of non-recrystallization zone reduction on microstructure and mechanical properties in multi-phase steel from the perspective of crystallographic structure, particularly, digitization and visualization of variant pairing. The volume fraction of deformation induced ferrite increased with the increase of non-recrystallization zone reduction, accompanied by the increase of acicular ferrite. This behavior is related to s...
Source: Materials Science and Engineering: A - February 10, 2020 Category: Materials Science Source Type: research

Tuning heterostructures with powder metallurgy for high synergistic strengthening and hetero-deformation induced hardening
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): Z.K. Li, X.T. Fang, Y.F. Wang, P. Jiang, J.J. Wang, C.M. Liu, X.L. Wu, Y.T. Zhu, C.C. KochAbstractHeterogeneous-lamella-structured Fe-Cu composites were fabricated using powder metallurgy, displaying an inverse “banana” curve between the strength and ductility. The density of domain interfaces and the strength difference between hard and soft domains can be tuned independently, providing a promising way to further study the hetero-deformation induced strengthening mechanisms of heterogeneous-lamella-structur...
Source: Materials Science and Engineering: A - February 9, 2020 Category: Materials Science Source Type: research

Growth kinetics, microhardness and microstructure evolution of undercooled FeCoNiCuSn high entropy alloy
Publication date: Available online 8 February 2020Source: Materials Science and Engineering: AAuthor(s): M.R. Rahul, Gandham PhanikumarAbstractMulti-principle element alloy FeCoNiCu with varying Sn addition was undercooled using the meltfluxing technique to illustrate the dependence of growth kinetics on Sn addition. The alloy FeCoNiCuSn0.5 shows morphological variation in the microstructure from dendritic to equiaxed grain morphology with the increase in undercooling. The alloy FeCoNiCuSn5 shows dendrite morphology with undercooling. The dendritic growth velocity was sluggish with solute addition,i.e., at an undercooling ...
Source: Materials Science and Engineering: A - February 9, 2020 Category: Materials Science Source Type: research

An investigation of the effect of pre-straining on the creep behaviour of a P91 steel at 600 °C using impression creep testing
Publication date: 3 March 2020Source: Materials Science and Engineering: A, Volume 776Author(s): S.J. Brett, C. Dyson, S. Maskill, A. Bridges, W. SunAbstractThis paper investigates the effect of high temperature tensile strain on subsequent creep strength in a grade 91 steel using impression creep testing. The grade 91 material investigated has been tested in two different microstructural conditions, in the normal martensitic condition and in an aberrant mis-heat treated condition in which the microstructure is 100% ferrite. The latter condition is of interest because of its widespread occurrence on operating power plant. ...
Source: Materials Science and Engineering: A - February 9, 2020 Category: Materials Science Source Type: research

Ti and TiC co-toughened Al2O3 composites by in-situ synthesis from reaction of Ti and MWCNT
This study aims to toughen brittle Al2O3 ceramics by preparing Al2O3–Ti–TiC multi-phase composites from Al2O3, TiH2 and multi-walled carbon nanotube (MWCNT) mixed powders. Co-toughened effects of soft Ti phase and hard TiC phase which was in-situ formed by reaction of Ti and MWCNT were studied. For this purpose, Ti and MWCNT with different content were added into Al2O3 matrix to fabricate multi-phase composites of Al2O3–Ti–TiC and their microstructure, mechanical and electrical properties were investigated. Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis indicated the...
Source: Materials Science and Engineering: A - February 7, 2020 Category: Materials Science Source Type: research

High temperature deformation and dynamic recrystallization behavior of AlCrCuFeNi high entropy alloy
Publication date: Available online 7 February 2020Source: Materials Science and Engineering: AAuthor(s): Xin Wang, Yunpeng Zhang, Xuelong MaAbstractThe high temperature deformation and dynamic recrystallization characteristics of multicomponent AlCrCuFeNi high entropy alloy, composed of simple FCC and BCC phases were studied in detail in the temperature range of 900–1050 °C and in the strain rate range of 0.001–1 s−1 by generating contour maps of multiple models using a high temperature thermomechanical simulator test. The processing maps consisting of dissipation and instability maps show that the ...
Source: Materials Science and Engineering: A - February 7, 2020 Category: Materials Science Source Type: research

Pronounced low-temperature superplasticity of friction stir processed Mg–9Li–1Zn alloy
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Mengran Zhou, Yoshiaki Morisada, Hidetoshi Fujii, Jian-Yih WangAbstractUltrafine Mg–9Li–1Zn alloy with average grain sizes of ∼0.61 μm (α phase) and ∼0.96 μm (β phase) was obtained by friction stir processing. A pronounced superplasticity from 369% to 1104% was obtained at 473 K over a wide range of strain rates from 10-1/s to 10-4/s. (Source: Materials Science and Engineering: A)
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Microstructure evolution and damage mechanism of layered titanium matrix composites under tensile loading
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Shuai Wang, LuJun Huang, Lin Geng, Yuan Sun, Hua-Xin Peng, ShaoXing QuAbstractIn order to better guide the design of layered metal matrix composites, the failure mechanism of a kind of Ti based layered composite was investigated. The results showed that this layered composites possessed better uniform deformation ability compared with the materials of each layer. Increasing the hard composite layer thickness led to enhancement of tensile strength but descend of deformation ability. The micro-cracks in the Ti layer provi...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

The activation of deformation mechanisms for improved tensile properties in nanocrystalline aluminum
We report tensile properties and TEM observations of in situ consolidated bulk nanocrystalline Al with an average grain size of 29 nm. The nanocrystalline Al is synthesized using a combination of cryogenic and room temperature ball milling. This nanocrystalline Al exhibits extremely high tensile strength, strain hardening rate, and ductility when compared with the conventional coarse-grained commercially pure Al. The tensile strength of this bulk nc Al is at least ten times higher than that of the coarse-grained Al with a total elongation of 10%. These results demonstrate the dependence of the extraordinary tensile prope...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Investigation of ultrasonic deformation characteristics of ultrathin miniaturized TA1 foil
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Yao Wang, Yingzhao Hou, Yang Liu, Ning Hu, Chunjun Wang, Lihui LangAbstractUltrasonic vibrations (UV) are widely employed in various precision manufacturing processes to obtain high product quality and processing efficiency. However, the plastic deformation behavior of high-strength, low formability and ultrathin (
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Experimental validation and microstructure characterization of topology optimized, additively manufactured SS316L components
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): B. Rankouhi, K.M. Bertsch, G. Meric de Bellefon, M. Thevamaran, D.J. Thoma, K. SureshAbstractThe integration of topology optimization (TO) and additive manufacturing (AM) has the potential to revolutionize modern design and manufacturing. However, few instances of manufactured optimized designs are documented, and even fewer examples of experimentally-tested designs are available. The lack of validation combined with the influence of AM process on material properties leaves a gap in our understanding of process-microstr...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Fabrication and mechanical properties of network structured titanium alloy matrix composites reinforced with Ti2AlC particulates
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Faming Zhang, Maolong Du, Kuowei Fan, Can Ye, Bin ZhangAbstractNetwork structured Ti-6.5Al–2Zr–1Mo–1V (TA15) matrix composites reinforced with Ti2AlC particles were fabricated by low energy ball milling and subsequent spark plasma sintering (SPS). Microstructures, mechanical properties, and wear resistance properties of the composites were evaluated as a function of Ti2AlC weight fraction. Experimental results showed that the fine Ti2AlC powders were adhered on the surface of the spherical TA15 powders...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

High temperature deformation behavior of Mg-5wt.%Y binary alloy: Constitutive analysis and processing maps
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Nooruddin Ansari, Brian Tran, Warren J. Poole, Sudhanshu S. Singh, Krishnaswamy Hariharan, Jayant JainAbstractThe high temperature deformation behavior of a Mg-5wt.%Y (Mg–5Y) binary alloy has been investigated using uniaxial compression test in the temperature range of 523 K–723 K and strain rate of 0.001 s-1 - 10 s-1. The true stress-strain curves depict that flow stress significantly decreases with the increase in temperature and decrease in the strain rate and vice-versa. An Arrhenius based hyperbolic...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Microstructure and hot deformation behavior of a new aluminum–lithium–copper based AA2070 alloy
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Jiashi Miao, Scott Sutton, Alan A. LuoAbstractThe effects of initial microstructure on hot compression behavior of a new Al–Li–Cu alloy AA2070 were studied in the temperature range of 250 °C–450 °C and strain rate range of 0.001 s−1 - 0.1 s−1. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were used to characterize microstructure prior to and post deformation. Two types of major strengthening precipitates we...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Densification of a high chromium cold work tool steel powder in different atmospheres by SLPS: Microstructure, heat treatment and micromechanical properties
Publication date: Available online 6 February 2020Source: Materials Science and Engineering: AAuthor(s): P.K. Farayibi, M. Blüm, S. WeberAbstractThe degradation of moulds, dies and tools employed in plastic, food and chemical processing industries has necessitated the development of suitable wear and corrosion-resistant materials. As improving the wear and corrosion resistance of iron base alloys tend to have opposing demands regarding chemical composition and heat treatment, optimisation of both parameters has to be kept in mind. One alloying element that is known to improve both corrosion and wear resistance of stee...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Effect of Yb addition on the microstructure and mechanical properties of ZK60 alloy during extrusion
Publication date: Available online 6 February 2020Source: Materials Science and Engineering: AAuthor(s): Huajie Wu, Tingliang Yan, Li Wang, Xinlin Li, Yaozhou Wei, Shuo Li, Xiang Wang, Ruizhi WuAbstractThe effect of Yb addition on the microstructure and mechanical properties of ZK60 alloy during extrusion was investigated. With the addition of Yb, bulk MgZnYb phases formed at grain boundaries during solidification and were partially broken into large particles (>1 μm diameter) during extrusion which promoted dynamic recrystallization (DRX) by particle-stimulated nucleation (PSN). However, the Yb atoms dissolved in ...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Effects of volume fraction of fine grains on the tensile creep properties of a hot-deformed Mg-Gd-Y-Zr alloy
Publication date: Available online 6 February 2020Source: Materials Science and Engineering: AAuthor(s): Yi Yang, Qinghuan Huo, Yuxiu Zhang, Lu Luo, Zhenyu Xiao, Jun Wang, Aki Hashimoto, Xuyue YangAbstractThe creep properties of a hot-compressed Mg-9Gd-4Y-0.5Zr alloy with different volume fractions (VFs) of fine grains were investigated at 523 K, 548 K and 573 K. Based on the initial VFs of fine grains, the samples were divided into four groups including VF0 (VF = 0), VF0.2 (VF = 20%), VF0.5 (VF = 50%) and VF0.8 (VF = 80%) samples. The VF0.8 sample had the highest yield stress at room temperature, fol...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

High temperature strain heterogeneities tracking within hole-specimens of FV566 turbine steel via digital image correlation
Publication date: Available online 6 February 2020Source: Materials Science and Engineering: AAuthor(s): Jianguang Bao, Adil Benaarbia, Siyuan Bao, Xiaofeng Guo, Yonghong Wang, Wei SunAbstractThis paper presents experimental and numerical investigations to study spatial-temporal distributions of strain heterogeneities within a FV566 turbine rotor steel subjected to high temperature conditions. Strain field were determined during monotonic tensile tests performed on flat specimens containing a circular hole to give rise to heterogeneous strain fields. A home-made digital image correlation system with an image restoration mo...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Fatigue behavior of ASTM A131 EH36 steel samples additively manufactured with selective laser melting
Publication date: Available online 4 February 2020Source: Materials Science and Engineering: AAuthor(s): Jingjing Wang, Meng Zhang, Xipeng Tan, Tong Liu, Guijun Bi, Hua Li, Shu Beng Tor, Erjia LiuAbstractBy tuning the process parameters mainly scanning speed ASTM A131 EH36 steel samples with high strength (1000 MPa) and fair ductility (10%) were additively manufactured through a selective laser melting process. A dual phase structure consisting of recrystallized fine ferrite and highly tempered martensite (
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Effect of crystal orientation on indentation-induced deformation behavior of zinc
Publication date: Available online 4 February 2020Source: Materials Science and Engineering: AAuthor(s): R. Sarvesha, Aditya Gokhale, Kislay Kumar, Nitin Kumar Sharma, Jayant Jain, Sudhanshu S. SinghAbstractThe present work systematically investigates the influence of crystal orientation on deformation response of quasi-single crystal zinc using nanoindentation. Both Berkovich and cono-spherical indenters were used to extract the quantitative information as well as to elucidate the deformation mechanisms with crystal orientations. The Young's modulus of zinc was highly anisotropic and increased as orientation changed from ...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

Tensile properties and bake hardening response of dual phase steels with varied martensite volume fraction
Publication date: Available online 4 February 2020Source: Materials Science and Engineering: AAuthor(s): Mohamed Soliman, Heinz PalkowskiAbstractA study has been made of the tensile properties on martensite plus ferrite dual phase (DP) steels. Tensile samples machined out of industrially produced DP steel sheet are quenched from the austenite plus ferrite phase field, so as to give a series of microstructures with varying martensite volume fraction (MVF) from 0.17 to 1. The strength of the produced DP steels is found to linearly increase with increasing the MVF, whereas their ductility showed a nonlinear decrease.Tensile s...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research

CoNiFeNb0.45 eutectic multi-principal element alloy with excellent mechanical properties and corrosion resistance
Publication date: Available online 5 February 2020Source: Materials Science and Engineering: AAuthor(s): Xulong An, Chenglin Chu, Hui Zhao, B.L. Shen, L. Zhou, Paul K. ChuAbstractA novel CoNiFeNb0.45 eutectic multi-principal element alloy (EMPEA) with a dual-phase structure is designed and synthesized by arc melting and suction casting. The compression strength of the CoNiFeNb0.45 EMPEA is 2.5 GPa at room temperature and high compression strength (1.2 GPa), furthermore, the excellent ductility with 40% fracture strain are maintained at 700 °C. The dislocation walls in the soft fcc phase provide the CoNiFeNb0.45...
Source: Materials Science and Engineering: A - February 6, 2020 Category: Materials Science Source Type: research