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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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    Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy

    D.L.GongH.L.WangE.G.ObbardS.J.Li...
    234-243页
    查看更多>>摘要：As to multifunctional titanium alloys with high strength and low elastic modulus,thermal training is crucial to tune their thermal expansion from positive to negative,resulting in a novel linear expan-sion which is stable in a wide temperature range.Aided by the high-order Hooke's law of elastic solids,a reversible atomic rearrangement mechanism was proposed to explain the novel findings which are unexpected from typical shape memory alloys.To confirm this continuous mechanism,a Ti-Nb based alloy,which possesses a nanoscale spongy microstructure consisting of the interpenetrated Nb-rich and Nb-lean domains produced by spinodal decomposition,was used to trace the crystal structure change by in-situ high energy synchrotron X-ray diffraction analyses.By increasing exposure time,the over-lapped diffraction peaks can be separated accurately.The calculated results demonstrate that,in the nanoscale Nb-lean domains,the crystal structure parameters vary linearly with changing temperature along the atomic pathway of the bcc-hcp transition.This linear relationship in a wide temperature range is unusual for first-order martensitic shape memory alloys but is common for Invar alloys with high-order spin transitions.Furthermore,the alloy exhibits smooth DSC curves free of transformation-induced heat peaks observed in shape memory alloys,which is consistent with the proposed mechanism that the reversible transition is of high-order.
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    Effect of post-bond heat treatment on the microstructure and high temperature mechanical property of a TLP bonded γ'-strengthened co-based single crystal superalloy

    S.Y.WangY.SunC.Y.CuiX.F.Sun...
    244-258页
    查看更多>>摘要：Post-bond heat treatment (PBHT) applied to a transient liquid phase (TLP) bonding joint is an effec-tive approach to remove the brittle borides and improve its properties.Herein,we proposed two types of PBHT strategies to obtain a TLP bonded γ'-strengthened Co-based single crystal superalloy,and the microstructural characteristics and tensile properties of the two heat treated joints were compared to identify the optimal PBHT strategy.The evolution of the brittle boride in the joint after the PBHT was studied by using in-situ microscopy.The experimental results allowed to provide a theoretic model to quantitatively evaluate the distribution of the brittle phase after the optimal PBHT and analyze the joint fractures to understand the failure mechanisms.The obtained results revealed that a post-bond solid solution treatment performed to the joint at a high temperature (over 1275 ℃) could decrease the area fraction of the boride from 7.2 ％ to 1.4 ％ and increase the elongation from 1.9 ％ to 7.8 ％.This work emphasizes the relevance of solid solution temperature when a PBHT strategy is applied.
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    Si/C particles on graphene sheet as stable anode for lithium-ion batteries

    Jian HanXiaonan TangShaofan GeYing Shi...
    259-265页
    查看更多>>摘要：Silicon is considered as one of the most promising anodes for Li-ion batteries (LIBs),but it is limited for commercial applications by the critical issue of large volume expansion during the lithiation.In this work,the structure of silicon/carbon (Si/C) particles on graphene sheets (Si/C-G) was obtained to solve the issue by using the void space of Si/C particles and graphene.Si/C-G material was from Si/PDA-GO that silicon particles was coated by polydopamine (PDA) and reacted with oxide graphene (GO).The Si/C-G material have good cycling performance as the stability of the structure during the lithiation/dislithiation.The Si/C-G anode materials exhibited high reversible capacity of 1910.5 mA h g-1 and 1196.1 mA h g-1 after 700 cycles at 357.9 mA g-1,and have good rate property of 507.2 mA h g-1 at high current density,showing significantly improved commercial viability of silicon electrodes in high-energy-density LIBs.
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    A high strength,wear and corrosion-resistant,antibacterial and biocompatible Nb-5 at.％ Ag alloy for dental and orthopedic implants

    Tian WanKangjie ChuJu FangChuanxin Zhong...
    266-278页
    查看更多>>摘要：Refractory metal niobium (Nb) incorporated with a small amount of silver (Ag),the resulting Nb-Ag two-phase alloys,were fabricated by mechanical alloying and spark plasma sintering.The microstructure,mechanical properties,wear resistance,corrosion behavior,in vitro and in vivo antibacterial properties and biocompatibility of the Nb-Ag alloys were systematically investigated.The results show that the mechanical properties,wear resistance,corrosion resistance and antibacterial ability were significantly enhanced after addition of 5 at.％ Ag.The fabricated Nb-5 at.％ Ag alloy demonstrates high yield strength of up to ～ 1486 MPa and fracture strain of ～ 35 ％.The precipitated Ag particles could reduce friction and wear.The enhanced corrosion resistance was attributed to the higher relative density of the sintered alloys and the formation of a stable and dense passive film of niobium and silver oxides.In vitro and in vivo evaluations show that the Nb-5 at.％ Ag alloy also has strong antibacterial activity and good biocompati-bility and osteointegration ability.These results demonstrate great potential of the nanostructured Nb-Ag alloys for dental and orthopedic implants.
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    Role of slip and {10-12} twin on the crystal plasticity in Mg-RE alloy during deformation process at room temperature

    Yunwei GuiYujie CuiHuakang BianQuanan Li...
    279-296页
    查看更多>>摘要：The deformation mechanism of slips and twins has a considerable influence on the plasticity of magne-sium alloys.However,the roles of slips and twins in the room-temperature deformation of Mg-rare earth(Mg-RE) alloys with high contents of rare earth elements is rarely investigated.Here,the microstruc-tural evolution and deformation mechanism of an aged Mg-SY-2Nd-3Sm-0.SZr alloy during uniaxial compression at room temperature were systematically investigated using in-situ electron-backscattered diffraction and transmission electron microscopy.The results indicated that in the early stage of defor-mation,the Mg-RE alloy was mainly controlled by the slip of <a> dislocations in the basal plane and the coordinated c-axis strain of the {10-12} twin.With an increase in the strain,the grain orientation became more suitable for the initiation of pyramidal Ⅱ <c + a> dislocations in the later stage of deforma-tion;these dominated the deformation mechanism.In the twin evolution of the Mg-RE alloy,there were three types of twin-twin interaction behaviors:(i) single twin variant 'parallel'structure,(ii) single twin variant 'cross' structure,and (iii) multi twin variant 'cross' structure.In addition,three types of twin-grain boundary interaction behaviors were summarized:(i) twin 'refracting through'grain boundary,(ii) twin'parallel through'grain boundary,and (iii) twin 'fusing through'grain boundary,which are expected to act as new means and solutions for the twin strengthening of magnesium alloys.
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