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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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    Optimizing crack initiation energy in austenitic steel via controlled martensitic transformation

    Minghao HuangLingyu WangChenchong WangYizhuang Li...
    231-242页
    查看更多>>摘要：Although the seemingly negative effect of deformation-induced martensite(DIM)volume fraction on the impact toughness of austenitic steels has been well documented,it relies mostly on analyzing crack prop-agation without explicitly considering the crack initiation process which,however,plays a crucial role in these ductile alloys.The dependence of crack initiation energy(Ei)on martensitic transformation mech-anisms is still ambiguous,inhibiting the precise design of damage-tolerant and ductile alloys.Here,we explore the temperature-dependent crack initiation energy of a SUS321 stainless steel at various temper-atures(25,-50,and-196 ℃).Contrary to the crack propagation energy(Ep),the Ei has a weak correlation with the volume fraction of α'-martensite but a strong correlation with the martensitic transformation rate.Also contrary to the traditional viewpoint of Ep considering ε-martensite as a detrimental phase,a high volume fraction of ε-martensite turns out to be beneficial to the increase of Ei,thereby enhancing impact toughness.As such,an optimal value(15 mJ/m2)for the stacking fault energy(SFE),which dic-tates the γ→ε→α'transformation sequence,is given as a new design guideline for enhancing the Ei and consequently the impact toughness of ductile steels.The generality of this guideline is further validated in multiple austenitic steels with different compositions and grain sizes.
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    A spatiotemporal"bulk erosion"mode in selective laser melted magnesium alloys and the resulting adverse cell & tissue responses

    Dong BianZhipei TongGencheng GongHe Huang...
    243-258页
    查看更多>>摘要：Selective laser melting(SLM)has attracted great attention in the fabrication of magnesium-based biodegradable implants.However,current SLMed magnesium alloys are generally suffered from rapid corrosion,which is deadly detrimental to their use.Herein,we thoroughly revealed why they are so vulnerable to corrosion through a typical SLMed AZ91D material model.An abnormally spatiotempo-ral"bulk erosion"mechanism was found,not the well-known"surface corrosion"mode of traditionally plastic-deformed alloys.The unique microstructure derived from SLM possesses high chemical reactivity,which is favorable for interactional attacks of fast fluid penetration,severe local corrosion and intensive micro-galvanic corrosion.Thus,it brings two orders of magnitude in corrosion rates compared with its plastic-deformed counterparts.In vitro,such fast-corrosion induced apparent cytotoxicity,cell damage,and further apoptosis to rat and mouse derived mesenchymal stem cells.In vivo,the material disinte-grates into small pieces in a short period,and results in unexpected bone destruction and long-lasting foreign body reactions in Sprague Dawley rats.Close attention should be paid to this issue before SLMed Mg-based implants being applied in patients.
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