首页|Composition design study of strong and ductile Mo-alloyed CoCrNi medium-entropy alloys

Composition design study of strong and ductile Mo-alloyed CoCrNi medium-entropy alloys

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The assistance of alloying elements provides enormous opportunities for the discovery of high-performance face-centered cubic(FCC)medium-entropy alloys(MEAs).In this work,the influence of al-loying element Mo on the phase stability,stacking fault energy(SFE),deformation mechanisms,lattice distortion,and mechanical properties of(CoCrNi)100-xMox(0 ≤ x ≤ 10)MEAs was synthetically explored with the first-principles calculations.It indicates that the FCC phase remains metastable at 0 K,and its stability degenerates with increasing Mo content.The monotonous decrease of SFE is revealed with the rise of Mo content,which promotes the activation of stacking faults,deformation twinning,or martensitic transformation.Raising Mo content also causes the aggravation of lattice distortion and thus triggers in-tense solid solution strengthening.Significantly,the essential criterion for the composition design of FCC(CoCrNi)100-xMo MEAs with superior strength-ductility combination was established based on the syner-gistic effects between multiple deformation mechanisms and solid solution strengthening.According to the criterion,the optimal composition is predetermined as(CoCrNi)93Mo7 MEA.The criterion is proved to be effective,and it can provide valuable inspiration for the development of alloying-element reinforced FCC multi-principal element alloys.

Medium-entropy alloysFirst-principles calculationsStacking-fault energySolute strengtheningDeformation twinningMechanical properties

J.X.Yan、J.Y.Qin、J.H.Liu、H.Chen、Y.H.Huang、M.Liu、C.H.Xia、F.Wang、X.D.Cui、J.B.Yang、Z.F.Zhang

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School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China

Southwest Technology and Engineering Research Institute,Chongqing 400039,China

Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China

Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

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National Natural Science Foundation of China(NSFC)Youth Project of Science and Technology Research Program of Chongqing Municipal Education CommissionNatural Science Foundation of ChongqingProject of Science Foundation in Chongqing Jiaotong University

52071316KJQN202300755cstc2021jcyjmsxmX0697F1210023

2024

10.1016/j.jmst.2023.10.050

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.186(19)
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