Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
Impact factor:6.155

The journal has been awarded the excellent periodical in China, and its articles are covered by SCI, EI, CA, SA, JST, RJ, CSA, MA, EMA, AIA etc., PASCAL web. ISI web of Science,SCOPUS.

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      20 February 2015, Volume 31 Issue 2 Previous Issue    Next Issue
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    Orginal Article
    Precipitation Behaviors in the Diffusion Affected Zone of TLP Bonded Single Crystal Superalloy Joint
    Naicheng Sheng, Jide Liu, Tao Jin, Xiaofeng Sun, Zhuangqi Hu
    J. Mater. Sci. Technol., 2015, 31 (2): 129-134.  DOI: 10.1016/j.jmst.2014.11.008
    Abstract   HTML   PDF
    The single crystal superalloys were joined by transient liquid phase (TLP) bonding. The precipitating behavior in the diffusion affected zone (DAZ) was studied and the hardness across the DAZ was analyzed. Results have shown that there existed M3B2, M5B3 and M23B6 borides in the DAZ. With increasing bonding time, fine M3B2 precipitates formed first near the isothermal solidification zone (ISZ)/matrix interface. Then, the dendritic M5B3 precipitates formed with an obvious orientation relationship with the substrate. The acicular precipitates were constituted by M23B6 and M5B3 phases with continuous or discontinuous morphologies. The hardness of the DAZ reached a summit in the fine M3B2 region and decreased with the increase of the distance away from the ISZ/matrix interface.
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    Thermal Stability of a New Ni-Fe-Cr Base Alloy with Different Ti/Al Ratios
    Changshuai Wang, Tingting Wang, Meilin Tan, Yongan Guo, Jianting Guo, Lanzhang Zhou
    J. Mater. Sci. Technol., 2015, 31 (2): 135-142.  DOI: 10.1016/j.jmst.2014.07.008
    Abstract   HTML   PDF
    Influence of Ti/Al ratios on the thermal stability of a new low cost Ni-Fe-Cr base wrought alloy, designed for application at 700°C in advanced ultra-supercritical coal-fired power plants (700°C A-USC), was investigated both experimentally and thermodynamically. After standard heat treatment, the alloys with different Ti/Al ratios had the same microstructural characteristics. However, compared with the alloys with high Ti/Al ratio, the low Ti/Al ratio can increase the γ′-solvus temperature, decrease γ′ coarsening rate and reduce the temperature range of η phase precipitation. For the alloys with low Ti/Al ratio, the yield strength has no obvious decrease during long-term thermal exposure at 700 and 750°C, but after thermal exposure at 750°C for 5000 h, the yield strength of the alloys with high Ti/Al ratio obviously decreases due to the η phase precipitation. The influence of η phase on mechanical properties is related with its size. When the η phase is small, it has no obvious influence on mechanical properties, but η phase becomes the crack initiation site with the further growth of η phase. It can be concluded that the decrease in Ti/Al ratio can improve the thermal stability to meet the requirement of 700°C A-USC coal-fired power plants.
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    Effect of Mo Addition on Microstructural Characteristics in a Re-containing Single Crystal Superalloy
    X.G. Liu, L. Wang, L.H. Lou, J. Zhang
    J. Mater. Sci. Technol., 2015, 31 (2): 143-147.  DOI: 10.1016/j.jmst.2013.12.019
    Abstract   HTML   PDF
    The effect of Mo addition on microstructural characteristics of a nickel-base single crystal superalloy containing 4 wt% Re was investigated. The γ/γ′ partitioning ratios determined by energy dispersive spectrometer attached to a transmission electron microscope showed that the addition of Mo enhanced the partitioning of Re, W and Cr in the γ matrix while decreased the concentration of Ta in the matrix. Synchrotron radiation diffraction was adopted to measure the γ/γ′ lattice misfit at room temperature. The results indicated that Mo addition changed the γ/γ′ lattice misfit towards larger negative as well as increased the tetragonal distortion of the γ lattice. Additionally, Mo addition led to microstructural instability and altered the precipitation behavior of topologically close-packed phases during 1100 °C exposure. Instead of precipitating directly from the matrix, the μ phase was observed to be converted from the σ phase which precipitated preferentially as a metastable intermediate in the alloy with high Mo content.
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    Effect of Annealing on Microstructure and Microhardness of Co-Fe-Ni-Ta-B-Si Bulk Metallic Glass
    Aytekin Hitit, Merve Ge, gin, Pelin , ztü, rk
    J. Mater. Sci. Technol., 2015, 31 (2): 148-152.  DOI: 10.1016/j.jmst.2014.09.004
    Abstract   HTML   PDF

    Effects of annealing temperature and time on microstructure and microhardness of Co41Ni2Fe20Ta5.5B26.5Si5 amorphous alloy have been investigated. Microhardness of the as-cast alloy is found to be 1170 HV. The maximum microhardness,1798 HV, is achieved after annealing the amorphous alloy at 1250 K for 10 min. Examination of the microstructure reveals that (Co,Fe)2B, (Co,Fe)21Ta2B6 and (Co,Fe)16Ta6Si7 phases precipitate in the matrix after annealing. Intrinsic hardness and Hall-Petch coefficients of the precipitates indicate that high hardness values result from precipitation of (Co,Fe)2B and (Co,Fe)21Ta2B6 phases. It is also observed that increasing the annealing time results in the decrease in microhardness values because of the increase in particle sizes of the precipitates.

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    Cutting Characteristics of Zr-Based Bulk Metallic Glass
    D.X. Han, G. Wang, J. Li, K.C. Chan, S. To, F.F. Wu, Y.L. Gao, Q.J. Zhai
    J. Mater. Sci. Technol., 2015, 31 (2): 153-158.  DOI: 10.1016/j.jmst.2014.11.010
    Abstract   HTML   PDF
    Cutting behavior exerts a considerable influence on the fabrication of bulk metallic glass (BMG) components. In this study, the influences of machining parameters (i.e., depth of cutting, feed rate, and spindle rate) on the turned surface of a Zr-based BMG after observing the 3D morphologies of this surface were characterized. The results showed that the influence of the spindle rate on the surface morphologies is more substantial as compared to the depth of cutting and the feed rate. Nanoscratch tests were conducted to further characterize the separation mechanism of the chips, which revealed that the chips are torn off the surface of a BMG because of inhomogeneous localized maximum shear stress.
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    Thermal Residual Stresses in W Fibers/Zr-based Metallic Glass Composites by High-energy Synchrotron X-ray Diffraction
    Xinqiang Zhang, Yunfei Xue, Haifeng Zhang, Huameng Fu, Zhengbin Wang, Zhihua Nie, Lu Wang
    J. Mater. Sci. Technol., 2015, 31 (2): 159-163.  DOI: 10.1016/j.jmst.2014.04.001
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    Thermal residual stresses in W fibers/Zr-based metallic glass composites were measured by in situ high energy synchrotron X-ray diffraction (HEXRD). The W fibers for the composites were 300, 500, and 700 μm in diameter, respectively. Coaxial cylinder model (CCM) and finite element model (FEM) were employed to simulate the distribution of thermal residual stress, respectively. HEXRD results showed that the selected diameters of W fiber had little influence on the value of thermal residual stresses in the present composites. Thermal residual stresses simulated by CCM and FEM were in good agreement with HEXRD measured results. In addition, FEM results exhibited that thermal residual stress concentrated on interface between the two phases and area where the two W fibers were the closest ones to each other.
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    Properties of Xanthoceras sorbifolia Husk Fibers With Chemical Treatment for Applications in Polymer Composites
    Hongyu Wang, Xudan Yao, Guoxin Sui, Liming Yin, Lihua Wang
    J. Mater. Sci. Technol., 2015, 31 (2): 164-170.  DOI: 10.1016/j.jmst.2014.07.004
    Abstract   HTML   PDF
    Surface science of natural fibers plays an important role in polymer/natural fiber composites. The Xanthoceras sorbifolia husk fibers were selected and chemically treated by sodium hydroxide (NaOH) solution, coupling agents, their combination, and the mixtures of acetic acid with hydrogen peroxide, respectively. 3-aminopropyltriethoxysilane (KH550), γ-methacryloxypropyltrimethoxylsilane (KH570) and organic titanate (JN-9A) were used as coupling agents in this work. Cellulose content was found to be increased after alkalization due to the removal of the non-cellulose substances, which was evidenced by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy spectrum analysis and thermogravimetric analysis (TGA) measurements. The highest cellulose content was obtained in the bleached fibers. TGA analysis revealed an improvement in thermal stability of the treated fibers, especially for alkali-KH570 treated fibers. The tensile strength of the alkali-KH570 treated fiber and the alkali-bleached fiber were higher than that of other fibers due to high cellulose content and high crystallinity.
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    Flexible Oxide-Based Thin-Film Transistors on Plastic Substrates for Logic Applications
    Jin Zhang, Yanghui Liu, Liqiang Guo, Ning Liu, Hui Xiao, Changqing Chen, Guodong Wu
    J. Mater. Sci. Technol., 2015, 31 (2): 171-174.  DOI: 10.1016/j.jmst.2014.07.009
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    Phosphorus doped (P-doped) nanogranular SiO2 films have been deposited by plasma-enhanced chemical vapor deposition. A high proton conductivity of ~3.2 × 10-4 S/cm and a large electric double layer (EDL) capacitance of ~3.2 μF/cm2 have been obtained. Flexible coplanar-gate EDL thin film transistors (TFTs) gated by P-doped nanogranular SiO2 films are self-assembled on plastic substrates at room temperature. Due to the big EDL capacitance, such TFTs show ultra-low voltage operation of 1 V, a large field-effect mobility of 18.9 cm2/Vs, a small subthreshold swing of 85 mV/decade and a high current on/off ratio of 107. Furthermore, the EDL TFT could work in dual coplanar gate mode. AND logic operation is realized. Our results demonstrate that such TFTs gated by P-doped nanogranular SiO2 films have potential applications in low-power flexible electronics.
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    Crystalline Size Effects on Texture Coefficient, Electrical and Optical Properties of Sputter-deposited Ga-doped ZnO Thin Films
    Yaqin Wang, Wu Tang, Lan Zhang
    J. Mater. Sci. Technol., 2015, 31 (2): 175-181.  DOI: 10.1016/j.jmst.2014.11.009
    Abstract   HTML   PDF
    C-axis oriented Ga-doped ZnO (GZO) films with various thicknesses were deposited on glass substrate by radio frequency (RF) magnetron sputtering. The dependence of crystal structure, electrical, and optical properties of the GZO films on crystalline size were systematically studied. The results showed that the texture coefficient of (002) peak (TC(002)) decreases with increasing crystalline size. The Hall mobility μ was reciprocal to electron effective mass and the fitted relaxation time τ was 0.11 ± 0.01 μs. With the increase of average crystalline size, the resistivity increased slightly, which is caused by the competition of (002) and (101) plane, introducing in some defects and leading to carrier density reduction. The optical band gap was in the range from 3.454 to 3.319 eV with increasing crystalline size from 26.96 to 30.88 nm, showing a negative relationship. The dependence of optical band gap on the crystalline size (R ) can be qualitatively explained by a quantum confinement effect. The relationship between and R of GZO films suggests that tuning up optical properties for desired applications can be achieved by controlling the crystalline size.
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    Promoting Bone Mesenchymal Stem Cells and Inhibiting Bacterial Adhesion of Acid-Etched Nanostructured Titanium by Ultraviolet Functionalization
    Guobo Lan, Mei Li, Ying Tan, Lihua Li, Xiaoming Yang, Limin Ma, Qingshui Yin, Hong Xia, Yu Zhang, Guoxin Tan, Chengyun Ning
    J. Mater. Sci. Technol., 2015, 31 (2): 182-190.  DOI: 10.1016/j.jmst.2014.08.007
    Abstract   HTML   PDF
    Titanium (Ti) and its alloys are used extensively in orthopedic implants because of their excellent biocompatibility, mechanical properties and corrosion resistance. However, titanium-based implant materials face many severe complications, such as implant loosening due to poor osseointegration and bacterial infections, which may lead to implant failure. Hence, preparing a biomaterial surface, which enhances the interactions with host cells and inhibits bacterial adhesion, may be an optimal strategy to reduce the incidence of implant failure. This study aims to improve osseointegration and confer antibacterial properties on Ti through a combination of two surface modifications including nanostructuring generated by acid etching and ultraviolet (UV) light treatment. Our results showed that without UV treatment, the acid etching treatment of Ti surface was effective at both improving the adhesion of bone mesenchymal stem cells (BMSCs) and increasing bacterial adhesion. A further UV treatment of the acid-etched surface however, not only significantly improved the cell adhesion but also inhibited bacterial adhesion. The acid-etched nanostructured titanium with UV treatment also showed a significant enhancement on cell proliferation, alkaline phosphatase (ALP) activity and mineralization. These results suggest that such nanostructured materials with UV treatment can be expected to have a good potential in orthopedic applications.
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    Analysis of the Transformation-induced Plasticity Effect during the Dynamic Deformation of High-manganese Steel
    Huizhen Wang, Xiurong Sun, Ping Yang, Weimin Mao, Li Meng
    J. Mater. Sci. Technol., 2015, 31 (2): 191-198.  DOI: 10.1016/j.jmst.2014.03.027
    Abstract   HTML   PDF
    The transformation-induced plasticity (TRIP) effect and resistance characteristics to adiabatic shear failure at high strain rates of high-manganese steel were investigated by using scanning electron microscopy and electron backscattering diffraction. Results showed that the high-manganese steel exhibited excellent strain hardening effect and resistance to adiabatic shear failure because of the TRIP effect. The TRIP effect occurred during dynamic deformation and showed two distinct stages, namely, the smooth TRIP process before the formation of adiabatic shear band (ASB) and the inhibited TRIP process during further deformation. In the first stage, the martensitic transformation showed slight orientation dependence and weak variant selection, which promoted the TRIP effect. In the second stage, reverse martensitic transformation occurred. Adiabatic shear bands (ASBs) developed typical shear microtextures {111}<>. In microtextures, two groups of fine grains are in a twin relationship and uniform distribution, which restrained the formation of holes and cracks within the ASBs and enhanced damage resistance after ASB formation.
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    Tempering Behavior of Ductile 1700 MPa Mn-Si-Cr-C Steel Treated by Quenching and Partitioning Process Incorporating Bainite Formation
    Guhui Gao, Han Zhang, Xiaolu Gui, Zhunli Tan, Bingzhe Bai
    J. Mater. Sci. Technol., 2015, 31 (2): 199-204.  DOI: 10.1016/j.jmst.2014.07.010
    Abstract   HTML   PDF
    We obtained a good combination of strength and ductility in a 0.4C-2.0Mn-1.7Si-0.4Cr (wt%) steel, namely, ~1.7 GPa of ultimate tensile strength and ~26% of elongation, by conducting a Q-P-T (quenching-partitioning-tempering) process incorporating the formation of carbide-free bainite. The tempering behavior of this steel was discussed by using experimental finding (scanning electron microscopy, X-ray diffraction (XRD), transmission electron microscopy and dilatometer) and CCE (constrained carbon equilibrium) modeling. The XRD results combined with CCE calculation prove that carbon partitioning from martensite to austenite occurs during tempering. Consequently, the thermodynamic stability of retained austenite is enhanced. This idea can be utilized to design novel Q-P-T processes in future.
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    Structural and Electronic Properties of BaO/MgO(001)-type Interface Studied via Aberration-corrected Transmission Electron Microscopy and First-principles Calculations
    Lei Deng, Shaobo Mi, Dong Chen, Yuanming Wang, Xiuliang Ma
    J. Mater. Sci. Technol., 2015, 31 (2): 205-209.  DOI: 10.1016/j.jmst.2014.09.003
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    The properties of BaO/MgO-type interface in the BaZrO3/MgO(001) heterostructure are studied by aberration-corrected high-resolution transmission electron microscopy combined with first-principles calculations. Experimental evidence demonstrates that cation displacement and vacancies occur at the interface. Our first-principle calculations show that cation displacement results from the electrostatic potential effect at the interface, and cation vacancies could lower the interfacial work of separation and enhance the interfacial stability of BaO/MgO-type interface. The results highlight that the effect of interfacial defects should be taken into account in understanding the film growth kinetics and properties in oxide heteroepitaxy.
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    Microstructure and Mechanical Properties of a CuCrZr Welding Joint After Continuous Extrusion
    Hui Feng, Haichang Jiang, Desheng Yan, Lijian Rong
    J. Mater. Sci. Technol., 2015, 31 (2): 210-216.  DOI: 10.1016/j.jmst.2014.03.025
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    The effect of continuous extrusion forming (CEF) process on the microstructure and mechanical properties of a CuCrZr welding joint was investigated. The experimental results showed that after the CEF process the grains were refined to submicron-scale through dynamic recrystallization, which improved the mechanical properties of the welding joint as well as the base material. Meanwhile, the micron-scale precipitates aggregated at the grain boundaries in the welding process were broken down to smaller ones and recrystallized grains of several micrometers formed around the precipitates after CEF process, which could alleviate the negative effect induced by the micron-scale precipitates during plastic deforming process. Finer grains and smaller micron-scale precipitates made contributions to improve the properties of a CuCrZr alloy with a welding joint.
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    CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel
    Honggang Dong, Zhonglin Yang, Zengrui Wang, Dewei Deng, Chuang Dong
    J. Mater. Sci. Technol., 2015, 31 (2): 217-222.  DOI: 10.1016/j.jmst.2014.04.003
    Abstract   HTML   PDF
    Vacuum brazing of TiAl alloy to 40Cr steel sheets was conducted with newly developed CuTiNiZrV amorphous foils. It was found that a diffusion layer, filler metal and reaction layer existed in the brazed seam. The diffusion layer in the joint brazed with Cu43.75Ti37.5Ni6.25Zr6.25V6.25 (at.%) foil was flat and thin, containing Ti19Al6 and Ti2Cu intermetallic compounds; however, the diffusion layer brazed with Cu37.5Ti25Ni12.5Zr12.5V12.5 foil was uneven with bulges, consisting of essentially Ti-based solute solution. The foil with 12.5 at.% V showed inferior spreadability compared to that with 6.25 at.% V at brazing temperature. However, fracture happened along the diffusion layer with 6.25 at.% V foil due to the formation of brittle intermetallic phases, but the joints brazed with 12.5 at.% V foil failed through the TiAl substrate. These results show that designing amorphous alloy with less Ti and more V for brazing TiAl alloy to steel is appropriate.
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    Growth Mechanism, Modified Morphology and Optical Properties of Coral-like BaTiO3 Architecture through CTAB Assisted Synthesis
    Pengjun Zhao, Lei Wang, Liang Bian, Jinbao Xu, Aimin Chang, Xinqian Xiong, Fanglong Xu, Jiaqi Zhang
    J. Mater. Sci. Technol., 2015, 31 (2): 223-228.  DOI: 10.1016/j.jmst.2014.04.002
    Abstract   HTML   PDF
    Three-dimensional hierarchical structure coral-like BaTiO3 nanoparticles have been self-assembled by a facile one step hydrothermal method. Cetyltrimethyl ammonium bromide (CTAB), Ba(OH)2·8H2O and tetrabutyl titanate have been used as precursors. The prepared BaTiO3 exhibits cubic perovskite phase at room temperature, and the coral-like architecture is a micro-nano hiberarchy consisted of dendrimer-like structure and trunk-like structure. By adjusting the hydrothermal duration and the precursor substances, a surfactant induced mechanism is proposed to understand the self-assembly process. UV-vis measurement demonstrates that the as-prepared BaTiO3 nanoparticles exhibit dozens of times overwhelming absorptive character compared to the ordinary nanospheres at ultraviolet band, which is benefited from the coral-like porous framework. Moreover, halogen anions( F-, Cl-, Br-, and I-) have been chosen to adjust the coral-like BaTiO3 physical properties. Results show the halogen doping produces distinct modulation effect on the grain size, UV-vis absorbance and photoluminescence properties of the materials. The coral-like BaTiO3 nanoparticle and its halogen modified ramifications offer significant opportunities to develop nano-laser devices, photon detectors, photocatalyst based on BaTiO3 perovskite materials.
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    Efficiency Enhancement of Cu(In,Ga)Se2 Solar Cells by Applying SiO2-PEG/PVP Antireflection Coatings
    Dezeng Li, Zhanqiang Liu, Yaoming Wang, Yongkui Shan, Fuqiang Huang
    J. Mater. Sci. Technol., 2015, 31 (2): 229-234.  DOI: 10.1016/j.jmst.2014.11.003
    Abstract   HTML   PDF
    An effective approach was presented to enhance photoelectric conversion efficiency of Cu(In,Ga)Se2 (CIGS) solar cells by using modified SiO2 antireflection coatings (ARCs) to harvest more incident sunlight. Polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP) used as additives were introduced into silica sols to prepare SiO2-PEG and SiO2-PVP coatings in the sol-gel dip-coating process, respectively. The different effects of PEG and PVP additives on SiO2 coatings were analyzed and the antireflection performance of SiO2-PEG and SiO2-PVP coatings was investigated. The transmittance over 97% ranging from 450 nm to 700 nm with a maximum transmittance over 99.40% at about 550 nm was achieved for both SiO2-PEG2000A and SiO2-PVP0.5 coatings. The relative efficiencies of CIGS solar cells coated with SiO2-PEG2000A and SiO2-PVP0.5 ARCs were increased by 7.27% and 8.33%, respectively. The modified SiO2 ARCs possessed the advantages of the low manufacturing cost, good adhesion, superior antireflective performance and the feasible method for large area fabrication.
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ISSN: 1005-0302
CN: 21-1315/TG
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