Possibilities of complex experimental study of thermophysical and thermodynamic properties of selected steels
Publication date: Available online 17 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Lenka Řeháčková, Vlastimil Novák, Bedřich Smetana, Dalibor Matýsek, Petra Váňová, Ľubomíra Drozdová, Jana DobrovskáAbstractIn this paper, selected key thermophysical and thermodynamical properties of steels (three alloys based on Fe–C–Cr) such as solidus (TS) and liquidus (TL) temperatures, peritectic transformation temperatures (TP), heats of fusion (ΔHF), specific heat capacities(cP), surface tension (σ), and wettability e...
Source: Journal of Materials Research and Technology - June 18, 2019 Category: Materials Science Source Type: research

Effect of alkyl chain length of amines on fluorapatite and aluminium phosphates floatabilities
Publication date: Available online 14 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Aline Pereira Leite Nunes, Antônio Eduardo Clark Peres, Arthur Pinto Chaves, Wanyr Romero FerreiraAbstractMicroflotation experiments and zeta potential measurements of fluorapatite, wavellite, and turquoise with the use of alkyl amines and amylopectin were conducted. The highest floatability values were achieved in the presence of dodecylamine, exceeding the floatabilities with octylamine between 30% and 90%. Above their respective isoelectric points, the phosphates reached approximately 100% of floatability ...
Source: Journal of Materials Research and Technology - June 15, 2019 Category: Materials Science Source Type: research

Clay/chitosan biocomposite systems as novel green carriers for covalent immobilization of food enzymes
Publication date: Available online 15 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Ilaria Cacciotti, Claudio Lombardelli, Ilaria Benucci, Marco EstiAbstractIn this work, innovative green composite systems, based on high amounts of montmorrilonite (MMT) and low amounts of chitosan in different relative ratios (70:30, 75:25, 80:20, % w/w), were proposed as potential alternatives to the free nanoclay particles, commonly used as carriers for enzymes covalent immobilization. In details, two different MMT were selected, i.e. SMP (a high purity unmodified MMT) and Optigel (OPT, an activated food-grade M...
Source: Journal of Materials Research and Technology - June 15, 2019 Category: Materials Science Source Type: research

Kinetic modeling of CuO chlorination with C2Cl4
Publication date: Available online 13 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Correia de Siqueira Rogério Navarro, Eduardo Teixeira de VasconcellosAbstractChlorinating roasting is a well-known process devoted manly for the extraction of metals as volatile chlorides from oxidized minerals and residues. Experience has shown that the use of a gaseous chlorinating agent, Cl2, for example, and the incorporation of a reducing agent, charcoal, for example, stimulate, respectively the kinetics and thermodynamics of the desired reactions. In this scenario, organo-chlorinated molecules, such as...
Source: Journal of Materials Research and Technology - June 14, 2019 Category: Materials Science Source Type: research

Mechanical testing and microstructure characterization of glass fiber reinforced isophthalic polyester composites
Publication date: Available online 14 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Ritesh Bhat, Nanjangud Mohan, Sathyashankara Sharma, Ashu Pratap, Agastya Prasad Keni, Dev SodaniAbstractThe present work investigates the effect of material geometry in terms of material thickness on the mechanical properties of glass fiber reinforced isophthalic polyesters. The tensile strength, flexural strength, and Barcol hardness quantify the mechanical properties in this article. The experimental tests as per the ASTM standards show that the tensile strength and hardness increase with the increase in the thi...
Source: Journal of Materials Research and Technology - June 14, 2019 Category: Materials Science Source Type: research

Porosity, density and mechanical properties of the paper of steam exploded bamboo microfibers controlled by nanofibrillated cellulose
This study focused on preparation of microfibers from bamboo culms using steam explosion with and without chemical treatments, and utilization of the isolated fibers in formation of bamboo paper fabricated with nanofibrillated cellulose (NFC). Compared with those obtained from the steam explosion alone (S), the bamboo microfibers isolated using the steam explosion followed by bleaching process (S/A) exhibited a significantly reduced fiber width of 7.5 μm and a markedly increased cellulose content of 97.85%. The S/A fiber showed an increased decomposition temperature, corresponding with lower contents of hemicellulo...
Source: Journal of Materials Research and Technology - June 14, 2019 Category: Materials Science Source Type: research

Bridging the local configurations and crystalline counterparts of bulk metallic glass by nanocalorimetry
In this study, a Ce68Al10Cu20Co2 (at.%) BMG was thermally devitrified by differential scanning calorimetry (DSC) and nanocalorimetry. At a heating rate of 10 K/min by DSC, AlCe3 and Ce are the major crystalline phases after devitrification while Al13Co4 quasicrystals and Ce are the dominant phases in the crystallization products at a heating rate of 5000 K/s by nanocalorimetry. Attributing to the covalent-like bond in Al–Co atom pairs, Al13Co4 quasicrystals precipitate in the primary crystallization and work as the precursors associating local atomic configurations in the glassy state with crystalline phase...
Source: Journal of Materials Research and Technology - June 11, 2019 Category: Materials Science Source Type: research

Effects of yttrium substitution for magnesium on the electrochemical performances of La2Mg1−xYxNi8.8Co0.2 hydrogen storage alloys
Publication date: May–June 2019Source: Journal of Materials Research and Technology, Volume 8, Issue 3Author(s): Huaiwei Zhang, Li Fu, Jianbo QiAbstractThe effects of yttrium substitution for magnesium in the La2Mg1−xYxNi8.8Co0.2 hydrogen storage alloys on the electrochemical properties are investigated in this paper. Yttrium substitution in the alloys can significantly improve the cycle stability, although the discharge capacity was decreased. The capacity and retention capacity after 20th cycle of the La2Mg0.9Y0.1Ni8.8Co0.2 alloys achieved values above 370 mAh/g and 95%, respectively, which already excee...
Source: Journal of Materials Research and Technology - June 9, 2019 Category: Materials Science Source Type: research

Editorial Board
Publication date: May–June 2019Source: Journal of Materials Research and Technology, Volume 8, Issue 3Author(s): (Source: Journal of Materials Research and Technology)
Source: Journal of Materials Research and Technology - June 9, 2019 Category: Materials Science Source Type: research

Microstructural evaluation of aluminium alloy A365 T6 in machining operation
Publication date: May–June 2019Source: Journal of Materials Research and Technology, Volume 8, Issue 3Author(s): Bankole. I. Oladapo, S. Abolfazl Zahedi, Francis.T. Omigbodun, Edwin A. Oshin, Victor A. Adebiyi, Olaoluwa B. MalachiAbstractThe optimum cutting parameters such as cutting depth, feed rate, cutting speed and magnitude of the cutting force for A356 T6 was determined concerning the microstructural detail of the material. Novel test analyses were carried out, which include mechanical evaluation of the materials for density, glass transition temperature, tensile and compression stress, frequency analysis and o...
Source: Journal of Materials Research and Technology - June 9, 2019 Category: Materials Science Source Type: research

Application of nitrogen doped bamboo-like carbon nanotube for development of electrically conductive lubricants
Publication date: May–June 2019Source: Journal of Materials Research and Technology, Volume 8, Issue 3Author(s): László Vanyorek, Dávid Kiss, Ádám Prekob, Béla Fiser, Attila Potyka, Géza Németh, László Kuzsela, Dirk Drees, Attila Trohák, Béla ViskolczAbstractThe aim of this work was to examine the applicability of nitrogen-doped bamboo-shaped carbon nanotubes (BCNTs) as conductive additive in bearing grease. To synthesize BCNTs, catalytic chemical vapour deposition (CCVD) method was used by applying butylamine as nitrogen containing c...
Source: Journal of Materials Research and Technology - June 9, 2019 Category: Materials Science Source Type: research

Impact-resistant polypropylene/thermoplastic polyurethane blends: compatible effects of maleic anhydride on thermal degradation properties and crystallization behaviors
In this study, impact-resistant polypropylene (MPP), thermoplastic polyurethane (TPU) and polypropylene-grafted maleic anhydride (MA) are made into MPP/TPU/MA blends using melt-compounding and injection methods. The blending morphology, crystallization behavior, and melting and thermal behaviors of the blends are evaluated in terms of the content of TPU and MA, examining the influences of the parameters. The scanning electron microscope (SEM) observation shows that 1 wt% of MA can effectively enhance the interfacial adhesion and compatibility between MPP and TPU. The differential scanning calorimetry (DSC) results sho...
Source: Journal of Materials Research and Technology - June 8, 2019 Category: Materials Science Source Type: research

In situ construction and sensing mechanism of TiO2–WO3 composite coatings based on the semiconductor heterojunctions
Publication date: Available online 4 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Yangguang Yao, Jianhui Yuan, Xiaoxiao Chen, Liming Tan, Qingshan Gu, Wenjie Zhao, Jieshi ChenAbstractTungsten oxide (WO3) is one of the most promising gas-sensitivity materials owing to its high decomposition temperature and stability of microstructure. The doping of oxides can significantly improve its gas-sensitivity properties. In this paper, WO3 based coatings doped with TiO2 were prepared via plasma spraying technology by using mixed feedstock suspensions containing a precursor as WCl6 and a certain ratio of na...
Source: Journal of Materials Research and Technology - June 5, 2019 Category: Materials Science Source Type: research

Correlation between segregation behavior and wall thickness in a rheological high pressure die-casting AC46000 aluminum alloy
Publication date: Available online 4 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Mingfan Qi, Jingyuan Li, Yonglin KangAbstractThe segregation behavior of a rheological high pressure die-casting (Rheo-HPDC) AC46000 aluminum alloy at positions with different wall thicknesses was studied. The results reveal that positions with different wall thicknesses exhibit different cooling rates that can result in distinctly different segregation characteristics. Segregation results in varying microstructure, elemental distribution, and hardness along the thickness of an alloy. The segregation in a Rheo-HPDC ...
Source: Journal of Materials Research and Technology - June 5, 2019 Category: Materials Science Source Type: research

Superior energy storage performance in Pb0.97La0.02(Zr0.50 Sn0.43Ti0.07)O3 antiferroelectric ceramics
Publication date: Available online 2 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Haojie Xu, Yu Dan, Kailun Zou, Guang Chen, Qingfeng Zhang, Yinmei Lu, Yunbin HeAbstractTo develop antiferroelectric based dielectric capacitors with superior energy storage capacity, antiferroelectric materials must possess simultaneously large recoverable energy density and high energy efficiency. With this motivation, in this work, we design and prepare Pb0.97La0.02(Zr0.50Sn0.43Ti0.07)O3 antiferroelectric ceramics with high Sn content considering that Sn element can narrow the electric hysteresis loops and thus im...
Source: Journal of Materials Research and Technology - June 4, 2019 Category: Materials Science Source Type: research

Barrier improvement of the biaxial oriented polypropylene films using passive mechanisms
In this study different compatibilizers and materials were examined in order to find an appropriate blend composition to minimize the oxygen permeability of the films. It was observed that using organoclay and nanocomposits have positive effect on the oxygen permeability although the kind of compatibilizer is important. Through all evaluated materials the PVA (Poly(vinyl alcohol)) and MA (Maleic Anhydride) were the most successful selection for this goal. The BOPP film blended by PVA achieved the lowest oxygen transfer rate (300 cc 20 μm/m2 24 h atm) in compared with all other conventional BOPP films. In a nov...
Source: Journal of Materials Research and Technology - June 2, 2019 Category: Materials Science Source Type: research

New approaches in lowering the gas-phase synthesis temperature of TiO2 nanoparticles by H2O-assisted atmospheric pressure CVS process
Publication date: Available online 2 June 2019Source: Journal of Materials Research and TechnologyAuthor(s): Mostafa Rahiminezhad-Soltani, Kamal Saberyan, Abdolreza Simchi, Christoph GammerAbstractH2O-assisted atmospheric pressure chemical vapor synthesis is a modern economical process for the gas-phase synthesis of TiO2 nanoparticles. In the present work, the influence of synthesis temperatures (100–800 °C) on the phase structure, nanoparticle size, morphology, and agglomeration is investigated by transmission electron microscopy, selected area electron diffraction, X-ray diffraction, thermogravimetry, and ...
Source: Journal of Materials Research and Technology - June 2, 2019 Category: Materials Science Source Type: research

Residual stress characterization in friction stir welds of alloy 625
Publication date: Available online 31 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Guilherme Vieira Braga Lemos, Alexandre Bellegard Farina, Rafael Menezes Nunes, Pedro Henrique Costa Pereira da Cunha, Luciano Bergmann, Jorge Fernandez dos Santos, Afonso RegulyAbstractAlloy 625 (UNS N06625) welded sheets were evaluated in the present study. Friction stir welding (FSW) was performed in a range of tool rotational speed from 1200 to 200 rpm, welding speed from 1.0 to 1.5 mm/s and constant axial force. Residual stress states were investigated by X-ray diffraction (XRD). Besides, microstructu...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

Impact of solid-solution treatment on microstructural characteristics and formability of rotary-swaged 2024 alloy tubes
In this study, the effects of the rotary swaging process and subsequent softening heat treatments, namely full annealing and solid-solution treatment, are investigated. The results show that rotary swaging refines grain size, decreases the eutectic phase fraction, enhances mechanical strength, and decreases mechanical elongation. Solid-solution treatment enhances work hardening ability and improves uniform elongation, and is thus more suitable for enhancing the formability of rotary-swaged alloys. The factors that affect microstructural characteristics and mechanical properties are discussed. (Source: Journal of Materials ...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

Optimization of the hot forging parameters for 4340 steel by processing maps
Publication date: Available online 31 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Aneta Łukaszek-Sołek, Janusz Krawczyk, Tomasz Śleboda, Jacek GrelowskiAbstractThe study presents an investigation of hot deformation behaviour of 4340 steel and optimization of its processing parameters. The isothermal compression tests were performed at the temperatures ranging from 800 to 1200 °C and at the strain rates in the range of 0.01–100 s−1. The changes in the microstructure of 4340 steel, resulting from processing, have also been studied. The workability parameters and process...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

On the pitting resistance of friction stir welded UNS S82441 lean duplex stainless steel
In this study, UNS S82441 lean duplex stainless steel was friction stir welded, and its microstructure and localized corrosion resistance were investigated by phase volumetric fraction, scanning electron microscopy, transmission electron microscopy and electrochemical tests. The pitting resistance of each zone was investigated by polarization tests and by determining the critical pitting temperature. The results indicated that microstructural changes promoted by friction stir welding affected the pitting resistance of the lean duplex stainless steel. (Source: Journal of Materials Research and Technology)
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

The cross-linked polyvinyl alcohol/hydroxyapatite nanocomposite foam
This article tries to indicate a new methodology in fabrication of PVA-based composite scaffolds using esterification and formalizing methods simultaneously to improve scaffolds’ water resistivity and their relative mechanical (up to 6.5 MPa in plateau stress) and biomedical properties. Hydroxyapatite nanoparticles are also added as a secondary agent to improve scaffolds’ water absorbance (in range of 58–71%), water uptake (from 5.9 to 9.1 times of initial weight) and bioactivity. Fourier Transform Infrared spectroscopy was used to prove the formation of new chemical bonds between the chains of PVA a...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

The effect of temperature on microstructure and mechanical properties of Al/Mg lap joints manufactured by magnetic pulse welding
Publication date: Available online 30 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Congcong Zhu, Liqiang Sun, Wenli Gao, Guangyao Li, Junjia CuiAbstractThe microstructure and mechanical properties of Al/Mg welded joints after heat preservation at different temperatures were examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and mechanical property test. The results showed that the treatment has no obvious effects on the morphology of the Al/Mg welding interface, but the morphology of the grain structure on the magnesium alloy side was impr...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

Visible light active indigo dye/graphene/WO3 nanocomposites with excellent photocatalytic activity
Publication date: Available online 30 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Muhammad Yousaf Khan, Manzoor Ahmad, Sana Sadaf, Saleem Iqbal, Faisal Nawaz, Javed IqbalAbstractTo enhance the applications of tungsten trioxide in terms of photocatalytic activity novel graphene based nanocomposites (indigo-RGO/WO3) were fabricated through hydrothermal method which shows efficient photocatalytic activity. Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), X-ray powder diffraction (XRD) and UV–Vis spectroscopy were carried out to characterize the prepared nanocomposite. Ph...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

Optimization of hematite and quartz BIOFLOTATION by AN artificial neural network (ANN)
This study assessed the implementation of a quadratic model and an artificial neural network (ANN) for the optimization of hematite and quartz floatability and recovery. The flotation process was carried out using a biosurfactant extracted from the Rhodococcus erythropolis bacteria. Quadratic model was adjusted by genetic algorithms techniques and validated using analysis of variance (ANOVA). Multilayered feed-forward networks were trained using a backpropagation algorithm, implemented using MATLAB R2017a. The topologies of the neural networks included 2 neurons in the input layer and 1 neuron in the output layer in both m...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

Structural and electrical properties of Ca0.9Dy0.1MnO3 prepared by sol-gel technique.
Publication date: Available online 31 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): K.R. Nandan, A. Ruban KumarAbstractIn the present study, we have discussed about the synthesis of Ca0.9Dy0.1MnO3 by using citric acid as a chelating agent. Structural and morphological studies were carried out by using XRD, FT-IR, FE-SEM equipped with EDX for the synthesized material. Magnetic studies are carried out by VSM and confirmed the paramagnetic behavior. The electric properties like dielectric, impedance and conductivity is carried out at the frequency range of 50 Hz to 5 MHz for different temper...
Source: Journal of Materials Research and Technology - June 1, 2019 Category: Materials Science Source Type: research

Editorial Board
Publication date: April 2019Source: Journal of Materials Research and Technology, Volume 8, Issue 2Author(s): (Source: Journal of Materials Research and Technology)
Source: Journal of Materials Research and Technology - May 30, 2019 Category: Materials Science Source Type: research

Effect of iron content on β → α phase transformation behavior of Ti-5Al-xFe (x = 1, 2.5, 4) alloys during continuous cooling
Publication date: Available online 29 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Gyeong Ryeong Bak, Jong Woo Won, Hye-Jeong Choe, Chan Hee Park, Yong-Taek HyunAbstractWe investigated the effect of Fe content on the β → α phase transformation behavior of Ti-5Al-xFe (x = 1, 2.5, 4) alloys during continuous cooling. The presence of Fe delayed long-range diffusional phase transformation, thus facilitating diffusionless transformation even at low cooling rates. This effect was explained by the extremely low solubility of Fe atoms in the α phase, so that they ...
Source: Journal of Materials Research and Technology - May 30, 2019 Category: Materials Science Source Type: research

Electrical and magnetic properties of NiTiO3 nanoparticles synthesized by the sol–gel synthesis method and microwave sintering
Publication date: Available online 29 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Pavithra C., Madhuri W.AbstractIn this paper, we focused on microwave sintered NiTiO3 nanoparticles synthesized via sol–gel method. The crystal structure was determined by the X-ray diffraction. Vibrational bands related to Ni–O and Ti–O bands were confirmed using the Fourier transform infrared spectrum. These NiTiO3 ceramics obeyed semiconductor behavior of Arrhenius type. The activation energy was found to be 0.04 μeV. The M–H curve exhibited superparamagnetic behavior at room tempe...
Source: Journal of Materials Research and Technology - May 30, 2019 Category: Materials Science Source Type: research

Improved photocatalytic decomposition of aqueous Rhodamine-B by solar light illuminated hierarchical yttria nanosphere decorated ceria nanorods
We report the new synthesis route of hierarchical yttria (Y2O3) nanosphere decorated ceria (CeO2) nanorods from the precursor cerium nitrate and yttrium nitrate under hydrothermal method (HM). Synthesized nanorods (NRs) were analyzed by different techniques to investigate their textural morphology, size and shape of nanorods and crystalline structures, morphology growth, optical activity and sizes of the samples. The luminescence blue peaks were observed in the range of 450–490 nm and green emission appeared at 533 nm at the room temperature (RT), the presence of oxygen vacancies was confirmed. The photodec...
Source: Journal of Materials Research and Technology - May 30, 2019 Category: Materials Science Source Type: research

Microemulsions and nanoemulsions applied to iron ore flotation
Publication date: Available online 30 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Maria Carlenise P.A. Moura, Afonso Avelino Dantas Neto, Antonio Eduardo C. Peres, Paula Romyne M.C. Neitzke, Tereza Neuma de Castro DantasAbstractThe present work investigates the microflotation of hematite and quartz using microemulsion and nanoemulsion systems as well as alkyl ether monoamine solutions. This application is based on the ability of such systems to reduce interfacial tension, which favors their application in separation processes. In these systems, the collector was composed by alkyl ether monoamine ...
Source: Journal of Materials Research and Technology - May 30, 2019 Category: Materials Science Source Type: research

Characterization of Al-7075 metal matrix composites: a review
The objective is to review the literature on fabrication of the aluminum metal matrix composite materials by combining alloys and reinforcements. The reinforcements may be particulate SiC, Al2O3, Gr, TiO2, bagasse ash, etc. These particulate reinforcements are incorporated in the stir casting method. The results revealed that, there is significant improvement in mechanical properties. Superior wear and corrosion resistance, low coefficient of thermal expansion as compared to conventional base alloys. (Source: Journal of Materials Research and Technology)
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

An Al–7Si alloy/cast iron bimetallic composite with super-high shear strength
Publication date: Available online 28 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Zhilin Guo, Min Liu, Xiufang Bian, Meijia Liu, Jianguo LiAbstractA new composite technology is presented consisting of the surface pretreatment of cast irons, the hot-dipping in a Zn–0.2 wt.% Bi melt and the Al/Fe composite process. The shear strength of Al/Fe (Al–7Si/cast iron) bimetallic composites fabricated by the technology is up to 32 MPa that is far more than the shear property obtained by composite technology reported in literatures. The super-high shear strength is mainly attributed to...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Technical and environmental evaluation of a new high performance material based on magnesium alloy reinforced with submicrometre-sized TiC particles to develop automotive lightweight components and make transport sector more sustainable
This study evaluated the use of submicrometre-sized particles based on titanium carbide from both technical and environmental points of view. The objective was to improve the mechanical properties of the magnesium alloy intended for use in the automotive component industry. To this end, an Al/TiC master compound containing 60 wt.% of TiC was produced through a self-propagating, high-temperature synthesis process and embedded in a magnesium alloy by a mechanical stirring method. The life cycle assessment methodology was then used to evaluate the environmental impact of the manufacturing of the magnesium alloy reinforce...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Tension Failure Simulation of Notched Composite Laminate Using Floating Node Method Combined with In-Situ Effect Theory
Publication date: Available online 29 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Kun Tian, Song Zhou, Chaozhi Yang, Jinhua Zhang, Chaobin ZhouAbstractIn order to model the progressive failure of laminates under tensile load, the finite element model adopting the floating node method combined with In-Situ effect strength theory is developed in this paper. The floating node method is based on the original finite elements to assign more additional degree of freedoms on the edges or nodes. In this way, it can realize crack propagation explicitly and prevent the singularity caused by the integration ...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Reinforcement of Aramid fiber with bagasse epoxy bio-degradable composite: investigations on mechanical properties and surface morphology
Publication date: Available online 29 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Selvaraj Anidha, Nachimuthu Latha, Manickam MuthukkumarAbstractIn this paper, the dynamic mechanical and tailored morphological behaviour of Aramid fiber (AF) treated with bagasse/epoxy (BG/E) resin, a bio-degradable composite, was investigated. Bio-degradable composite with homogeneous microstructures were fabricated using hand lay-up technique with untreated bagasse/epoxy matrix and treated 5% Aramid fiber with bagasse/epoxy resin (BG/E). Three different types of composites with different BG to epoxy (40:60, 50:50...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Thermal stability of ultrafine grained AA8090 Al–Li alloy processed by repetitive corrugation and straightening
Publication date: Available online 29 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Jenix Rino John Xavier Raj, Balasivanandha Prabu SanmugavelAbstractThe thermal stability of an ultrafine-grained (UFG) AA8090 Al–Li alloy with an average grain size of 2 μm is reported. The UFG structure was obtained by repetitive corrugation and straightening (RCS) process after 8 passes using optimized processing parameter conditions identified in the previous research, i.e., processing temperature 300 °C; ram velocity 1.5 mm/s using V-Grooved corrugating die profile (pitch 20 mm, ...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Optimization of TMCP strategy for microstructure refinement and flow-productivity characteristics enhancement of low carbon steel
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Eman El-Shenawy, Reham RedaAbstractImproving the mechanical properties of low carbon steel through the microstructural refinement without adding alloying elements is a complicated scientific and technical mission. This challenge can be overcome by using thermo-mechanical controlled processing (TMCP) technology. Most researches have examined the influence of TMCP on the microstructure development without shed light on the flow characteristics. The current work aims at studying the effect of applying different TMCP st...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Laser welding of AZ31B magnesium alloy with beam oscillation
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Kangda Hao, Hekang Wang, Ming Gao, Run Wu, Xiaoyan ZengAbstractCircular beam oscillation was introduced to laser welding of 2 mm-thick AZ31 magnesium alloy. The appearance, microstructure and tensile properties of the welds were investigated. It was found that the low frequency about 50 Hz and the small radius about 0.5 mm are more beneficial to improve the weld appearance, under the given parameters of laser power 2 kW, welding speed 2 m/min and beam oscillating diameter 0.35 mm. The u...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Evaluation of the physical properties of fluorescent carbon nanodots synthesized using Nerium oleander extracts by microwave-assisted synthesis methods
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Sinem Simsek, Melis Ozge Alas, Belma Ozbek, Rukan GencAbstractRapid and one-step green synthesis of carbon nanodots (CDs) from Nerium oleander leaves was accomplished via domestic microwave oven and microwave-assisted hydrothermal synthesizer under various physical conditions. Effects of the synthesizer system, extract type depending on the solvents used in plant extraction, and synthesis conditions; such as reaction time, reaction temperature, surface passivation agent inclusion into the reaction medium, on the phy...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

General modeling of flow stress curves of alloys at elevated temperatures using bi-linearly interpolated or closed-form functions for material parameters
In this study, a promising model is presented to describe the flow stress curves with acceptable accuracy as well as generality. In this model, peak strain, peak stress, steady-state stress and hardening and softening constants are uncoupled and expressed as either bi-linearly interpolated or closed-form functions of temperature and strain rate. A practical method to obtain material constants is developed to render the model applicable in practice, which is based on optimization scheme. The flow stress curves of four materials are obtained using the new model and compared with experiments or the other models at some specif...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Toughness properties of a friction hydro pillar processed offshore mooring chain steel
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Diogo Trento Buzzatti, Mariane Chludzinki, Rafael Eugenio dos Santos, Jonas Trento Buzzatti, Guilherme Vieira Braga Lemos, Fabiano Mattei, Ricardo Reppold Marinho, Marcelo Torres Piza Paes, Afonso RegulyAbstractIn the past few years, solid-state welding has been a great alternative in comparison to the conventional fusion welding technologies. Solid-state welds are usually processed in lower temperatures than the other common fusion joints, tending to avoid problems such as hydrogen embrittlement, brittle microstruc...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Effects of fibre treatment on mechanical properties of kenaf fibre reinforced composites: a review
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Muhammad.H. Hamidon, Mohamedb T.H. Sultan, Ahmad H. Ariffin, Ain U.M. ShahAbstractThere have been review on kenaf fibre (KF) production and mechanical properties but lacks review on the treatment and surface modification on kenaf fibre. Therefore, this study is to show the type of treatment that have been done by previous researcher. A lot of methods have been investigated to find the optimum method to obtain better condition and properties for kenaf fibre. The present review describes those applied to kenaf fibre. ...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Manufacturing optimisation of an original nanostructured (beta + gamma)-TiNbTa material
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Cristina García-Garrido, Carlos Gutiérrez-González, Ramón Torrecillas, Luis Pérez-Pozo, Christopher Salvo, Ernesto ChicardiAbstractAn original (beta + gamma)-TiNbTa material was manufactured by an optimised powder metallurgy treatment, based on a mechanical alloying (MA) synthesis, carried out at low energy, and a subsequently field assisted consolidation technique, the pulsed electric current sintering (PECS). The successful development of this (beta + gamma)-T...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Potentiodynamic polarization studies of Cefadroxil and Dicloxacillin drugs on the corrosion susceptibility of aluminium AA6063 in 0.5 M nitric acid
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Ojo Sunday Isaac Fayomi, I.Godwin Akande, Abimbola Popoola Idowu Popoola, Hlatswayo MolifiAbstractThe inhibition effectiveness of Cefadroxil (C) and Dicloxacillin (D) drugs on aluminium in 0.5 M nitric acid solution have been holistically studied using potentiodynamic polarization techniques, weight loss measurements, computational studies and structural characterization. The structural characterizations were carried with the aid of scanning electron microscope equipped with energy dispersive spectrometer (SEM/...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Theoretical confirmation of an established experimental phase diagram of ternary system (Cu(SO4)–Zn(SO4)–H2O) at 25 °C: Pitzer parameters determination
This study was confirmed numerically while going through the calculation of the binary and ternary Pitzer parameters for the studied salts through a Nelder Mead simplex algorithm. Indeed, the comparison of these with the bibliographic data has confirmed the accuracy of our experimental results. (Source: Journal of Materials Research and Technology)
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Microstructural characteristics of magnesium alloy sheets subjected to high-speed rolling and their rolling temperature dependence
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Jeong Hun Lee, Sang Won Lee, Sung Hyuk ParkAbstractMicrostructural and textural variations of an AZ31 Mg alloy during its high-speed rolling (HSR) and their dependence on the rolling temperature are investigated by performing HSR at temperatures of 300 °C, 350 °C, and 400 °C at a rolling speed of 470 m/min with 80% reduction in a single pass. Shear band formation is observed in all the high-speed-rolled (HSRed) materials; however, with increasing rolling temperature, the density and i...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Dry sliding wear characteristics of aluminium metal matrix composites: a brief overview
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Nosa Idusuyi, John I. OlayinkaAbstractAluminium composites with reinforcements in the form of whiskers, particulates or continuous/discontinuous fibres are referred to as aluminium metal matrix composites (Al MMCs). These form of composites can be engineered to effectively provide tailored property combinations such as high strength to weight ratio, specific strength, specific stiffness, creep resistance and low density compared to conventional engineering materials. Al MMCs have become choice materials in applicati...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

Abrasion resistance and toughness of a ductile iron produced by two molding processes with a short austempering
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): J.R. Dueñas, W. Hormaza, G.M. Castro GüizaAbstractAustempered ductile irons (ADI) have been extensively used in applications that require a high wear resistance. To further improve it, this work analyzes the effects of both two molding conditions and a short austempering process in the abrasion resistance and toughness of a ductile iron. To do so, the cast and heat-treated specimens were analyzed using several stages including microstructural analysis, mechanical testing and roughness measurements. The e...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research

A comparative study of hydrogen-induced cracking resistances of API 5L B and X52MS carbon steels
Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Rodrigo Monzon Figueredo, Mariana Cristina de Oliveira, Leandro Jesus de Paula, Heloisa Andréa Acciari, Eduardo Norberto CodaroAbstractSusceptibility to hydrogen-induced cracking of API 5L B and X52MS low-carbon steels in NACE 177-A, 177-B and 284-B solutions has been investigated by the present work. A metallographic analysis of these steels was performed before and after NACE TM0284 standard testing. Corrosion products were characterized by scanning electron microscopy and X-ray dispersive energy spectromet...
Source: Journal of Materials Research and Technology - May 29, 2019 Category: Materials Science Source Type: research