首页|Sparse identification-assisted exploration of the atomic-scale deformation mechanism in multiphase CoCrFeNi high-entropy alloys

Sparse identification-assisted exploration of the atomic-scale deformation mechanism in multiphase CoCrFeNi high-entropy alloys

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This study investigated the atomic-scale deformation mechanism of multiphase CoCrFeNi high-entropy alloys(HEAs)at liquid helium,liquid nitrogen,and room temperatures.A million-atom multiphase HEA was prepared using molecular dynamics simulation involving melt and quench processes.The HEA exhibited high-density dislocations and some twins,consistent with experimental observations.Quantitative analysis revealed an inconsistent evolution of the microstructure under tensile de-formation.In particular,the elastic and initial plastic stages exhibited an increase in the disordered structure at the expense of the face-centered cubic and hexagonal close-packed structures,followed by a subsequent transformation involving multiple structural rearrangements.Furthermore,through sparse identification,a model depicting microstructural evolution during ten-sion was extracted for the CoCrFeNi HEA at three typical temperatures and three tensile rates.The model highlighted the importance of the body-centered cubic structure in the evolutionary process.

high-entropy alloydata-driven methodmicrostructure evolutionmultiphase structuremolecular dynamics simulation

XIAO Lu、GUO XiaoXiang、SUN YuTong、WANG Gang、LONG WeiMin、LIAW Peter K.、REN JingLi

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School of Mathematics and Statistics,Zhengzhou University,Zhengzhou 450001,China

Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,China

Institute of Materials,Shanghai University Shanghai 200444,China

SKL of Advanced Brazing Metals & Technology,Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450001,China

Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN 37996,USA

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国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金

U23A20655207129851971123DMR-16111801809640

2024

10.1007/s11431-023-2589-3

中国科学:技术科学(英文版)
中国科学院

中国科学:技术科学(英文版)

CSTPCDEI
影响因子：1.056
ISSN：1674-7321
年,卷(期)：2024.67(4)
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