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材料科学技术（英文版）
材料科学技术（英文版）

胡壮麟

月刊

1005-0302

jmst@imr.ac.cn

024-83978208

110016

沈阳市沈河区文化路72号

材料科学技术（英文版）/Journal Journal of Materials Science & TechnologyCSCDCSTPCD北大核心EISCI
查看更多>>本刊简称《JMST》，（ISSN 1005-0302，CN 21-1315/TG）。1985年创刊。是中国科协主管，中国金属学会，中国材料研究学会和中国科学院金属研究所联合主办的国际性英文期刊，以“加强国际交流，扩大学术影响，服务经济建设”为办刊宗旨，刊登世界各国的具有创新性和较高学术水平的原始性论文，并设有物约综述、快报、简讯及国内外材料界杰出学者简介等栏目，内容包括金属材料、无机非金属材料、复合材料及有机高分子材料等。
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    Effect of thermo-mechanical processing parameters on the dynamic restoration mechanism in an Mg-4Y-2Nd-1Sm-0.5Zr alloy during hot compression

    Yunwei GuiLingxiao OuyangYibei XueQuanan Li...
    205-224页
    查看更多>>摘要：Microstructure evolution and dynamic restoration mechanism of solution-treated Mg-4Y-2Nd-1Sm-0.5Zr alloy have been studied under three TMP parameters consisting of deformation temperatures (350-500 ℃),strain rates (0.01-5 s-1),and strains (0.2,0.4,and 0.8).A strong dynamic softening is observed in all stress-strain curves,even at higher strain rates (1 and 5 s-1) due to an adiabatic heating effect.Various stress-strain curves are applied to construct a processing map and develop an Arrhenius-type constitutive equation.With the prediction of the processing map,an optimal processing domain has been determined to be the temperature range 450-500 ℃ and strain rate range 0.01-0.1 s-1 at a strain of 0.8.The volume fraction of DRX grains is the largest in the corresponding domain of high temperature and low strain rate.For the effect of TMP parameters on the dynamic restoration,the discontinuous dynamic recrystallization(DDRX) and continuous DRX (CDRX) synergistic effect occur throughout the whole process at high tem-perature and high strain rate.In terms of high temperature and low strain rate,DDRX characteristics at a low strain and then the DDRX + CDRX synergistic effect is observed at a higher strain.Although the DRX process is weak at low temperature and low strain rate,deformation twins have occurred and provided nucleation sites for DRX grains.
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    Fluorine doping for improved thermoelectric properties of spark plasma sintered bismuth telluride

    Jinseo KimLe Thai DuyHyunwoo KangByungmin Ahn...
    225-235页
    查看更多>>摘要：Bismuth-telluride (Bi2Te3) is considered to have the best thermoelectric properties at room temperature(ca.300 K).Thus,synthesis and improvement of Bi2Te3 and its derivatives quickly and cost-effectively at favorite temperatures are of interests.Recently,doping fluorine (F) into electronic materials (e.g.,FTO) has gained attention;however,it is not applied to Bi2Te3 till now.Here,our synthesis of F-doped Bi2Te3 for thermoelectric application is introduced using spark plasma sintering (SPS) for Bi2Te3 preparation and reactive ion etching (RIE,with SF6 gas) for F-doping.The exposure time of SF6 plasma is adjusted to evaluate F-doping effect on the thermoelectric properties of the samples.During characterizations,the increased electrical conductivity and the improved Seebeck coefficient of F-doped Bi2Te3 are observed.Through spectroscopic studies and DFT calculations,the main mechanism behind that improvement is unveiled.It also emphasizes the essential role of the F-doping (optimum treatment time of 40 s) in in-creasing the carrier concentrations as well as electrical conductivity.With increasing measurement tem-perature (300-510 K),F-doping raises the figure of merit of electron rich Bi2Te3 from 1.0 to 1.11 (peaked at 390 K).
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    Investigation on peritectic solidification in Sn-Ni peritectic alloys through in-situ observation

    Peng PengAnqiao ZhangJinmian YueShengyuan Li...
    236-242页
    查看更多>>摘要：The solidification of Sn-Ni peritectic alloys in which both the primary Ni3Sn2 and peritectic Ni3Sn4 phases were intermetallic compound phases (IMCs) with narrow solubility ranges was investigated through con-focal laser scanning microscope.Analysis on the interface migration at different cooling rates shows that the rate of peritectic reaction is much smaller than previous reports,and the growth of peritectic phase is mainly attributed to direct precipitation from the melt in Sn-Ni alloy after peritectic reaction.In addi-tion,different from other peritectic alloys where the solidified phases are solid solution phases,the "step"growth of both Ni3Sn2 and Ni3Sn4 phases was observed.The dependences of the step thickness on both the cooling rate and solidification time were measured,which shows that the step thicknesses of both phases gradually decrease as solidification proceeds.This was confirmed to be attributed to the difference between the actual and equilibrium melt concentrations during solidification.In addition,the increase of the normal growth velocity of Ni3Sn4 phase with increasing cooling rate was also proved through both the experimental observation and quantitative prediction.
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    A review on molten sulfate salts induced hot corrosion

    Shanshan HuHarry FinkleaXingbo Liu
    243-254页
    查看更多>>摘要：Hot corrosion has been extensively observed in various high temperature applications,which might cause large economic losses.To deepen the insight and understanding of hot corrosion,herein,we provide a de-tailed discussion on hot corrosion induced by molten sulfate salt,in which Na2SO4 is the main chemical reactant.The hot corrosion is triggered and sustained by the negative solubility gradient of protective oxide from the oxide/salt interface to salt/gas interface.In this work,we reviewed several key factors,including temperature,gas composition,molten salt composition,alloy element and external stress,in-fluencing the hot corrosion of alloy beneath the molten salt.The application of anti-corrosion coating seems to be the most effective and commercial mothed to mitigate hot corrosion.Therefore,the progress of the development of effective coatings,e.g.,Ni-Cr coatings,aluminide coatings,silicide coatings and MCrAlY(X) coatings,has also been summarized.
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    Reduced graphene oxide-modified NiCo-phosphates on Ni foam enabling high areal capacitances for asymmetric supercapacitors

    Chao SunLi SunYuanxing ZhangHaochen Si...
    255-263页
    查看更多>>摘要：NiCo-phosphates can deliver high specific capacitances and high electrochemical activities as pseudoca-pacitive electrode material for supercapacitors.In this study,The NiCo-phosphates@reduced graphene oxide (NCPO@rGO) composite is directly loaded on Ni foam by a simple one-step hydrothermal process.The conductive rGO sheets provides continuous electron pathways between NCPO flowers and Ni foam,allowing active electrochemical reactions throughout the whole electrode.This can solve the difficulty of low active material utility and small areal capacitances in the Ni foam-supported electrodes.At the same time,the rGO sheets creates large amount of mesopores within the electrode,which can ensure a highly open structure for electrolyte attachment and ion transport.Because of the positive effect of rGO in improving charge transfer,the NiCo-phosphates can be fully involved in the electrochemical reactions with high utility,ensuringhighspecificcapacitances(1416.7Fg-1 at 1 Ag-1)andhigh-rateperformances.Specially,the areal capacitance of the NCPO@rGO electrode can reach as large as 3.69F cm-2 at 1 A g-1,which is among the highest ones in Ni foam supported electrodes.An asymmetric supercapacitor is then fabricated by NCPO@rGO as the positive material with attractive energy densities and power densities,further proving its excellent electrochemical performance.
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