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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      10 February 2016, Volume 32 Issue 2 Previous Issue    Next Issue
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    Orginal Article
    Analytical Description for Solid-State Phase Transformation Kinetics: Extended Works from a Modular Model, a Review
    Feng Liu, Kai Huang, Yi-Hui Jiang, Shao-Jie Song, Bin Gu
    J. Mater. Sci. Technol., 2016, 32 (2): 97-120.  DOI: 10.1016/j.jmst.2015.12.015
    Abstract   HTML   PDF
    Solid-state phase transformation plays an important role in adjusting the microstructure and thus tuning the properties of materials. A general modular, analytical model has been widely applied to describe the kinetics of solid-state phase transformation involving nucleation, growth and impingement; the basic conception for iso-kinetics which constitutes a physical foundation for the kinetic models or recipes can be extended by the analytical model. Applying the model, the evolution of kinetic parameters is an effective tool for describing the crystallization of enormous amorphous alloys. In order to further improve the effectiveness of this kinetic model, recently, the recipes and the model fitting procedures were extended, with more factors (e.g., anisotropic growth, soft impingement, and thermodynamic driving force) taken into consideration in the modified models. The recent development in the field of analytical model suggests that it is a general, flexible and open kinetic model for describing the solid-state phase transformation kinetics.
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    Fast and Huge Anisotropic Diffusion of Cu (Ag) and Its Resistance on the Sn Self-diffusivity in Solid β-Sn
    Peitao Liu, Shoulong Wang, Dianzhong Li, Yiyi Li, Xing-Qiu Chen
    J. Mater. Sci. Technol., 2016, 32 (2): 121-128.  DOI: 10.1016/j.jmst.2015.12.007
    Abstract   HTML   PDF
    The site preferences, fast and huge anisotropic diffusion mechanisms of Cu (Ag) in β-Sn as well as their reduction on the self-diffusivity of Sn, have been investigated using the first-principles and ab initio molecular dynamics methods. We have found that Cu prefers the interstitial site, whereas Ag is preferable in the substitutional site, which is mostly dominated by their different size factors. Electronic structure further evidences that thed-s hybridization between the solute and the host atom also contributes to the site preferences. It is also deduced that the fast diffusion of Cu (Ag) is mostly due to the interstitial diffusion mechanism and their diffusivity can be correlated with the amount of their respective interstitial solution. Their faster diffusion along the c-axis can be attributed to the extremely low migration energy barrier caused by the straight tunnel of considerable size with the screw axis symmetry of 2π/4 along the c-axis. Furthermore, it is found that during the process of diffusion the interstitially dissolved Cu (Ag) atoms would combine with the nearby Sn-vacancy and further annihilate the vacancy, thereby reducing the self-diffusion of Sn.
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    Flexural Strength and Weibull Analysis of Bulk Metallic Glasses
    Jijun Zhang, Diana Est, vez, Yuan-Yun Zhao, Lishan Huo, Chuntao Chang, Xinmin Wang, Run-Wei Li
    J. Mater. Sci. Technol., 2016, 32 (2): 129-133.  DOI: 10.1016/j.jmst.2015.12.016
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    The flexural strength reliability of bulk metallic glasses (BMGs) plates is analyzed using Weibull statistics. The Weibull modulus (m) and characteristic strength (σ0) of the Zr48Cu45Al7 BMG are 34 and 2630?MPa, respectively, which are much higher than the values of fine ceramics (m?<?30, σ0?<?1600?MPa). In particular, the m values obtained by flexural strength and compressive strength statistics of the Mg61Cu28Gd11 BMG are 5 and 33, respectively, indicating that the m values of BMGs are test method dependent, and only the m values obtained by flexural strength statistics can be used to make a convincible comparison with those of ceramics.
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    MnFe2O4@PANI@Ag Heterogeneous Nanocatalyst for Degradation of Industrial Aqueous Organic Pollutants
    Md. Amir, U. Kurtan, A. Baykal, H. S, zeri
    J. Mater. Sci. Technol., 2016, 32 (2): 134-141.  DOI: 10.1016/j.jmst.2015.12.011
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    This paper reports a stable heterogeneous nanoparticles catalyst MnFe2O4@PANI@Ag for the degradation of azo dyes. In this synthesizing method, MnFe2O4 is used as magnetic core and polyaniline (PANI) a linker to stabilize the Ag nanoparticles (NPs) on the surface of catalyst. The method has a high ability to prevent Ag NPs from aggregation on the PANI surface, thus resulting in small size and highly dispersed Ag NPs. The composition and nano-structural features of polycrystalline sample were studied by X-ray powder diffractometry, Fourier transform infrared spectroscopy, and scanning electron microscopy. Vibrating sample magnetometer measurements proved the super-paramagnetic property of the catalyst, and UV results demonstrated that MnFe2O4@PANI@Ag has a high ability to reduce the azo dyes, which come from industrial wastes in the form of pollutant. The nanocomposites could be readily separated by magnet and reused for the next four reductions with high generation efficiency.
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    Mixture of Oxides with Different Valence States in Nanotubes
    Xiaoli Zhao, Meilin Dai, Shujun Li, Yulin Hao, Rui Yang, Lei Wang, Yandong Liu
    J. Mater. Sci. Technol., 2016, 32 (2): 142-146.  DOI: 10.1016/j.jmst.2015.10.017
    Abstract   HTML   PDF
    biomedical Ti2448 alloy by anodic oxidation in neutral electrolyte. Similar to oxide nanotubes fabricated on pure titanium and its alloys, the as-grown nanotubes on Ti2448 also exhibit gradually changing chemical distribution along the direction of tube growth. Furthermore, several kinds of oxides with different valence states (MxOy) are formed simultaneously for each alloying element M, while their volume fractions vary gradually along the tube-growth direction. The findings of this study would provide insight into the effect of valence states on the desired nanotube properties and help develop ways to enhance the properties of the preferred oxide.
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    Interfacial Synthesis of δ-MnO2 Nano-sheets with a Large Surface Area and Their Application in Electrochemical Capacitors
    Zhijun Jia, Jun Wang, Yi Wang, Bingyang Li, Baoguo Wang, Tao Qi, Xin Wang
    J. Mater. Sci. Technol., 2016, 32 (2): 147-152.  DOI: 10.1016/j.jmst.2015.08.003
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    Birnessite-type MnO2 (δ-MnO2) nano-sheets were successfully synthesized by an interfacial synthesis method in this work. The properties and electrochemical performance of the as-prepared δ-MnO2 were analyzed and evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen adsorption measurement and electrochemical tests. This facile synthesis method enables δ-MnO2 nano-sheets to show a large specific surface area (257.5?m2?g-1). The electrochemical test results show that the specific capacitance is 272?F?g-1 and the specific capacitance retention is over 96.7% after 1000 cycles at a scan rate of 10?mV?s-1. All results demonstrate that δ-MnO2 has a great potential application in high-performance electrochemical capacitors, and this interfacial synthesis method will be a very promising method to synthesize highly active MnO2 materials in a large scale.
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    ZnS/Bacterial Cellulose/Epoxy Resin (ZnS/BC/E56) Nanocomposites with Good Transparency and Flexibility
    Fangyi Guan, Shiyan Chen, Jingjing Yao, Weili Zheng, Huaping Wang
    J. Mater. Sci. Technol., 2016, 32 (2): 153-157.  DOI: 10.1016/j.jmst.2015.08.014
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    ZnS/bacterial cellulose/epoxy resin (ZnS/BC/E56) nanocomposites with good transparency and flexibility were prepared and characterized. When the precursor Zn2+concentrations were not more than 1?wt%, the size of the introduced ZnS nanoparticles was smaller than 50?nm and the distribution was homogeneous within the composites. Under the condition, outstanding transmittance more than 70% in the visible light was obtained. By incorporation of ZnS nanoparticles with excellent thermo-optic stability to the composites, the thermo-optic coefficient was obviously increased from -361?×?10-6 to -310?×?10-6?K-1. The good flexibility, optical and mechanical properties endow the nanocomposites potential applications in the flexible optoelectronic materials.
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    Fabrication of Flexible Transparent Conductive Films with Silver Nanowire by Vacuum Filtration and PET Mold Transfer
    Wei Xu, Qingsong Xu, Qijin Huang, Ruiqin Tan, Wenfeng Shen, Weijie Song
    J. Mater. Sci. Technol., 2016, 32 (2): 158-161.  DOI: 10.1016/j.jmst.2015.12.009
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    The flexible transparent conductive films (FTCFs) of silver nanowire-polyethylene terephthalate (AgNW-PET) were prepared by a facile method including vacuum filtration and mold transferring. The effect of silver nanowire weight density on the optical and electrical properties of films, as well as the electrical percolation was investigated. The obtained typical AgNW-PET film exhibited high figure of merit of 31.3?×?10-3-1 with low sheet resistance of 4.95?Ω?sq-1 and high transparency at 550?nm of 83.0% (excluding PET substrate). The resulting FTCFs based on PET substrate with high transmittance and low sheet resistance have a great potential in the application of high-performance flexible electronics and photovoltaic devices.
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    Shape Memory Effect, Thermal Expansion and Damping Property of Friction Stir Processed NiTip/Al Composite
    D.R. Ni, J.J. Wang, Z.Y. Ma
    J. Mater. Sci. Technol., 2016, 32 (2): 162-166.  DOI: 10.1016/j.jmst.2015.12.013
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    NiTi particles reinforced aluminum (NiTip/Al) composite was prepared via friction stir processing, eliminating interfacial reaction and/or elemental diffusion. The NiTip in the composite maintained the intrinsic characteristic of a reversible thermoelastic phase transformation even after heat-treatment. The shape memory characteristic of the NiTip decreased the coefficient of thermal expansion of the Al matrix, and an apparent two-way shape memory effect was observed in the composite. The composite owned a good combination of adjustable damping and thermal physical properties.
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    Tungsten Inert Gas Welding-Brazing of AZ31B Magnesium Alloy to TC4 Titanium Alloy
    Chuan Xu, Guangmin Sheng, Hui Wang, Ke Feng, Xinjian Yuan
    J. Mater. Sci. Technol., 2016, 32 (2): 167-171.  DOI: 10.1016/j.jmst.2015.12.003
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    Tungsten inert gas (TIG) welding-brazing technology using Mg-based filler was developed to join AZ31B Mg alloy to TC4 Ti alloy in a lap configuration. The results indicate that robust joints can be obtained with welding current in the range of 60-70?A. The joint interface was found to be likely composed of Mg-Ti diffusion reaction layer accompanied with Mg17Al12 precipitate phase, indicating that metallurgical joining was achieved. The optimized joint with average tensile-shear strength of 190 N/mm2 was obtained and fracture occurred at the Ti/fusion zone interfacial layer during tensile test. Moreover, the fracture surface was characterized by equiaxed dimple patterns accompanied with a few lamellar tearing. Finally, finite element modeling (FEM) numerical simulation was developed to analyze the distribution characteristics of the temperature field of joints.
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    Coarsening Behavior of Gamma Prime Precipitates in a Nickel Based Single Crystal Superalloy
    S. Tang, L.K. Ning, T.Z. Xin, Z. Zheng
    J. Mater. Sci. Technol., 2016, 32 (2): 172-176.  DOI: 10.1016/j.jmst.2015.10.005
    Abstract   HTML   PDF
    The γ/γ' microstructural evolution in a nickel based single crystal superalloy during load-free thermal exposure at 900?°C has been further investigated in this paper. The growth characteristics of γ′ precipitates were discussed in detail. The generation of interfacial dislocations would accelerate the rate of coalescence in the dendrite arms. The average sizes of precipitates were used to compare interface with diffusion controlled growth mechanism and no mechanism seems obviously dominant, although the square rate law gives slightly better fit. The coarsening behavior may be controlled by diffusion through the ragged interface between the γ′ precipitate and the γ matrix.
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    Effect of C and Hf Contents on the Interface Reactions and Wettability between a Ni3Al-Based Superalloy and Ceramic Mould Material
    Xiaoyan Chen, Yizhou Zhou, Tao Jin, Xiaofeng Sun
    J. Mater. Sci. Technol., 2016, 32 (2): 177-181.  DOI: 10.1016/j.jmst.2015.11.007
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    The influence of active elements C and Hf on the interface reactions and wettability between a Ni3Al-based superalloy and the ceramic mould material was studied by using a sessile drop experiment. The microstructure of the alloy interface was investigated by scanning electron microscopy analysis and the phase identification was performed by X-ray diffraction analysis. The results show that interface reactions occur as C and Hf contents reach a critical value. The critical values for C and Hf to cause interface reactions are 0.12 wt% and 1.17 wt%, respectively. The reaction products contain HfO2 and 9Al2O3·Cr2O3. Adsorptions of Hf and interface reactions improve the wettability obviously.
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    Ink Dispersion on Qianlong Xuan Paper with Improved Ink Expression
    Shuyi Wu, Xinglong Wu, Paul K. Chu
    J. Mater. Sci. Technol., 2016, 32 (2): 182-188.  DOI: 10.1016/j.jmst.2015.12.014
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    Qianlong Xuan paper, lost two hundred years ago, was reproduced by engineers in Red-Star Xuan Paper Limited Liability Company of China. Its remarkable performance and profound historical value are highly regarded by artists and the paper commands very high price in the commercial market. Ink penetrates and spreads optimally in the paper and the words exhibit clear edges with small fluctuations because of the desirable wettability and wicking. These characteristics make it stand out from three Xuan paper samples. The good wettability, verified by contact angle measurements, is an essential prerequisite to strong wicking. Attenuated total reflectance Fourier-transform infrared spectroscopy is performed to determine the chemical structure of Qianlong Xuan paper and the relatively large hydrogen bonding ratio contributes to the hydrophilicity. The microstructure investigated by scanning electron microscopy and atomic force microscopy reveals wide fibers and a uniform fiber arrangement with good connectivity, dense network, as well as rough fiber surface. These unique properties endow Qianlong Xuan paper with strong wicking to improve the ink expression.
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    Microstructure and Mechanical Properties of 06Cr13Ni4Mo Steel Treated by Quenching-Tempering-Partitioning Process
    Yuanyuan Song, Jingping Cui, Lijian Rong
    J. Mater. Sci. Technol., 2016, 32 (2): 189-193.  DOI: 10.1016/j.jmst.2015.10.004
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    A heat treatment process, quenching-tempering-partitioning (Q-T-P), has been applied to a low carbon martensitic stainless steel 06Cr13Ni4Mo. By using this process, ultrafine reversed austenite can be obtained at room temperature. The microstructures of the reversed austenite and the martensite matrix were characterized by transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) in detail. The results show that the ultrafine reversed austenite is enriched in Ni resulting in the austenite stability at room temperature. Two new types of nano-scale carbide precipitates are found in the martensite matrix. Detailed analysis suggests that the two nano-scale precipitates can be identified as ω phase and λ phase carbides, respectively. The orientation relationship between the ω phase and matrix is , while that between the λ phase precipitate and matrix is . For the present steel, the ultrafine reversed austenite and carbide precipitates obtained by Q-T-P treatment provide a good combination of high strength and toughness.
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ISSN: 1005-0302
CN: 21-1315/TG
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