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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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    Variation of mechanical properties and microstructure of hot-rolled AA2099 Al-Li alloy induced by the precipitation during preheating process

    Fei GuoWeijiu HuangXusheng YangHaipeng Dong...
    198-209页
    查看更多>>摘要：Preheating is the first step for thermal-mechanical processing of the materials.Several preheating sched-ules were designed based on industrial manufacturing to explore their effect on the microstructure and mechanical properties of AA2099 Al-Li alloy during the following hot rolling.The results show that the mechanical properties of as-rolled sheets are quite sensitive to preheating.Various types of secondary phases,including δ',T1 and T2 phases,were precipitated during the heating process.The difference among precipitates is the main reason to induce the variation of mechanical properties for as-rolled sheets.A rapid heating rate gave rise to the precipitation of δ'phase,which largely promoted yield stress and ultimate tensile strength in as-rolled sheets.T1 phase was more favorable in the preheating with a holding period at 150-250℃,which caused a moderated strain hardening behavior.Precipitates formed during preheating induced different slip behaviors in the following deformation.The coexistence of T1 and δ'phase could restrict planar slip,which inhibited the formation of the shear band.The difference in the activity of non-octahedral slips and planar slips determined the strain hardening effect,which should be the reason for the variation of mechanical properties of as-rolled sheets.
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    Dislocation glide and mechanical twinning in a ductile VNbTi medium entropy alloy

    Mingxu WuShubin WangFei XiaoGuoliang Zhu...
    210-215页
    查看更多>>摘要：An equiatomic VNbTi medium-entropy alloy with outstanding tensile properties and unique deformation behavior is reported.The screw dislocation glide,deformation twinning,and dislocation accumulation induced kink bands are identified as three deformation mechanisms that contribute to a large elonga-tion above 20％.The{112}<111>twins are activated at the beginning of the yield stage accompanied by sudden stress-drop and pronounced acoustic emission.Dislocations dominate subsequent tensile de-formation,and the prevalent multiplanar dislocation slip promotes the formation of complex dislocation configurations(e.g.,debris,dipoles,and loops)and dense dislocation networks.The twin bands and kink bands can further impede the dislocation motion meanwhile effectively alleviate stress concentration.The synergistic activation of these deformation mechanisms provides new opportunities to design ductile refractory medium-and high-entropy alloys.
      原文链接:
    • 维普
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    Nano-phase transformation of composite precipitates in multicomponent Al-Mg-Si(-Sc)alloys

    S.B.WangC.F.PanB.WeiX.Zheng...
    216-226页
    查看更多>>摘要：Sc-addition can significantly enhance the performance of the micro-alloyed Al-Mg-Si-Sc alloys.However,the mechanisms by which the Sc element modifies the microstructure of the alloys are still unknown in many cases.Here,using atomic-scale transmission electron microscopy and atomic-resolution spec-troscopy,we have revealed the microstructural differences between two age-hardened Al-0.5Mg-0.4Si(wt.％)alloys with and without Sc-addition.The first significant effect of Sc-addition on the precipitation microstructure of the Al-Mg-Si-Sc alloy is that Sc-atoms may distribute at the β"-precipitate/Al-matrix interface and therefore accelerate aging kinetics at the initial stage of hardening.The second significant effect of Sc-addition is that in the transition from the β"-hardened peak-age stage to the β'-hardened late stage,Sc-atoms can greatly improve the stability of transitional β"/B'/β''composite precipitates by entering the B'-substructures and/or locating at the precipitate/Al interfaces.As such Sc-atoms effectively suppress β"to β''transformation and cross-sectional coarsening of both β"and composite precipitates,leading to much finer precipitate needles with smaller diameter but much larger length,as compared with those precipitate needles formed in the alloy without Sc-addition.Hence,the alloy with Sc-addition exhibits a much better thermal stability than that without Sc.
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    • 维普
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    Controlling the mechanical properties and corrosion behavior of biomedical TiZrNb alloys by combining recrystallization and spinodal decomposition

    Pengfei JiBohan ChenShuguang LiuBo Li...
    227-238页
    查看更多>>摘要：Excellent comprehensive mechanical properties and corrosion resistance of TiZrNb equiatomic ratio medium-entropy alloy were obtained through recrystallization and spinodal decomposition.In addition to solid solution strengthening and recrystallization,the excellent mechanical properties can also be at-tributed to the hindering effect of nanoprecipitation formed via spinodal decomposition on the move-ment of dislocations.The high atomic arrangement density due to spinodal decomposition reduces the surface energy of the alloy passivation film,thereby increasing the activation energy of dissolution and the bonding energy between atoms,which improve the corrosion resistance and stability of the alloy passivation film.This work provides a new strategy to control the mechanical properties and corrosion resistance by combining recrystallization and spinodal decomposition.
      原文链接:
    • 维普
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    Concurrent improvements of corrosion resistance and coercivity in Nd-Ce-Fe-B sintered magnets through engineering the intergranular phase

    Jiaying JinYongming TaoXinhua WangZeyu Qian...
    239-245页
    查看更多>>摘要：Usually the improved coercivity of rare earth(RE)based 2∶14∶1-type permanent magnets via RE-rich in-tergranular additives is achieved at the cost of more corrosion channels and deteriorated corrosion re-sistance,which remains a challenging hurdle in the RE-Fe-B community.Distinctly,here we report the concurrent improvements of corrosion resistance and coercivity in 40 wt.％Ce-substituted Nd-Ce-Fe-B sintered magnets through engineering the intergranular phase using simple(Nd,Pr)Hx additive.The de-hydrogenated Nd/Pr changes the RE concentration gradients between 2∶14∶1 matrix and intergranular phases during sintering and enlarges the fraction of corrosion-resistant REFe2 phase,rather than the con-ventionally assumed Nd/Pr-rich intergranular phase with high chemical vulnerability.The spontaneous formation of REFe2 intergranular phase after(Nd,Pr)Hx addition generates the uniquely enhanced cor-rosion resistance against the hot/humid and acidic environments,and counts as one peculiar feature of Nd-Ce-Fe-B magnets at high Ce substitution level,being distinct from previously reported Ce-free/lean RE-Fe-B.Simultaneously,the formation of continuous grain boundaries enhances the coercivity from 8.7 to 12.5 kOe with trace addition of(Nd,Pr)Hx.Above findings may spur progress towards developing a high-performance Nd-Ce-Fe-B permanent magnet.
      原文链接:
    • 维普
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    Magnetic field-induced strategy for synergistic CI/Ti3C2Tx/PVDF multilayer structured composite films with excellent electromagnetic interference shielding performance

    Qing LiuYi ZhangYibin LiuChunmei Li...
    246-259页
    查看更多>>摘要：Lightweight,scalable,mechanically flexible conductive polymer composite was always desirable for elec-tromagnetic interference(EMI)shielding applications.In this work,we showcased a novel approach to the superior EMI shielding composite materials by orchestrating the multilayered structure and syner-gistic system.The asymmetric structure with the carbonyl irons(CI)-rich Ti3C2Tx/poly(vinylidene fluo-ride)(PVDF)magneto-electric layer jointly behind the Ti3C2Tx nanosheets filled PVDF layer was designed and fabricated with the aid of a facile but efficient magnetic field-induced method and was then hot-pressed into a multilayer structured film.Ti3C2Tx nanosheets were excluded by CI agglomeration layer in the asymmetric film to form the complete 3D electrical conductive skeletons.Based on this strategy,EMI shielding properties of the asymmetric multilayer structured composite was superior to the homo-geneous blend and sandwiched or alternating layered composites.In addition,an increase in CI content in the composite referred to the thickening of CI-rich layers,making it gain the most powerful EMI SE values,i.e.42.8 dB for DCMP20-10 film(20 wt％CI,10 wt％Ti3C2Tx)at a thickness of 0.4 mm.More im-portantly,the composite transformed from a reflection type to an absorption dominating EMI shielding material due to the multireflections and magneto-electric synergism in the CI-rich Ti3C2Tx/PVDF layers.Meanwhile,the EMI SE of the composites can be adjusted by increase of either theoverall thickness,or the layer numbers of m-DCMP sheets.The thickness specific EMI SE was calculated as 165.25 dB mm-1 for 4-sheet composite film,a record high value among the high efficiency polymer-based EMI shielding materials.This method offered an alternative protocol for preferential integration of excellent EMI shield-ing performance with high mechanical performance in CPC materials.
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    Shear banding-induced<c+a>slip enables unprecedented strength-ductility combination of laminated metallic composites

    Shuang JiangRu Lin PengKristián MáthisHai-Le Yan...
    260-268页
    查看更多>>摘要：Shear bands in metallic materials have been reported to be catastrophic because they normally lead to non-uniform plastic deformation.Ductility of laminated metallic composites deteriorates with increasing processing strain,particularly for those having hexagonal-close-packed(hcp)constituents due to inade-quate slip systems and consequently prominent shear banding.Here,we propose a design strategy that counterintuitively tolerates the bands with localized strains,i.e.the shear banded laminar(SBL)struc-ture,which promotes<c+a>dislocation activation in hcp metals and renders unprecedented strength-ductility combination in hcp-metal-based composites fabricated by accumulative roll bonding(ARB).The SBL structure is characterized with one soft hcp metal constrained by adjacent hard metal in which dis-locations have been accumulated near the bimetal interfaces.High-energy X-ray diffraction astonishingly reveals that more than 90％of dislocations are non-basal in Ti layers of the SBL Ti/Nb composite processed by eight ARB cycles.Moreover,<c+a>dislocations occupy a high fraction of～30％,promoting further<c+a>cross slip.The unique stress field tailored by both shear banding and heterophase interface-mediated de-formation accommodation triggers important<c+a>slip.This SBL design is of significance for developing hcp-based laminates and other heterostructured materials with high performances.
      原文链接:
    • 维普
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    High throughput synthesis enabled exploration of CoCrFeNi-based high entropy alloys

    L.ZhaoL.JiangL.X.YangH.Wang...
    269-282页
    查看更多>>摘要：To accelerate the exploration,screening,and discovery of structural high-entropy alloys with targeted properties,the newly developed High-Throughput Hot-Isostatic-Pressing based Micro-Synthesis Approach(HT-HIP-MSA)is employed to efficiently synthesize and characterize 85 combinatorial alloys in a 13-principal element alloying space.These CoCrFeNi-based high entropy alloys span 1 quaternary,9 quinary,and 36 senary alloy systems,and their composition-structure-property relationships are characterized and analyzed experimentally and computationally.From the single-phase FCC CoCrFeNi alloy base,with Mn,Cu,Ti,Nb,Ta,Mo,W,Al,and Si as principal element alloying additions,we find(1)the extended Mn solubility in the single-phase FCC CoCrFeNi-Mnx alloys,(2)the destabilizing behavior for most of the quinary and senary alloys,and(3)the distinctive solid-solution-strengthening effects in the alloys.In combining the computational methods,the HT-HIP-MSA can be systematic and economic to explore and refine the compositions,structures,and properties of structural high-entropy alloys.
      原文链接:
    • 维普
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