Dynamic compression behavior of TiZrNbV refractory high-entropy alloys upon ultrahigh strain rate loading
作者机构：College of SciencesNational University of Defense TechnologyChangsha 410008China Aviation Maintenance NCO AcademyAir Force Engineering UniversityXinyang 464001China The Peac Institute of Multiscale SciencesChengdu 610031China College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410008China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第161卷第30期
页 面：201-219页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：This study was financially supported by the Hunan Provin-cial Natural Science Foundation of China(Grant No.2022JJ10058) the National Natural Science Foundation of China(Grant Nos.12072369 and 52171166).The authors thank Dr.Xuehao Zheng from the ZKKF(Beijing)Science and Technology Company of China for supporting the SEM and TEM analyses.The authors would like to acknowledge Dr.Xiang Wu from KAIPLE Centre for Microscopy,Characterisation&Analysis(CMCA)of China for supporting the EBSD analyzes
主 题：Refractory high-entropy alloys Shock compression Spall Dynamic yield Equation of state Ultrahigh strain rate
摘 要：In this study,the dynamic compressive response behavior of a body-centered cubic(BCC)single-phase TiZrNbV refractory high-entropy alloy(RHEA)was investigated under impact at speeds of 313-1584 m s^(-1)using two-stage,gas-gun-driven,high-speed plate-impact experiments;recovery sample analysis;and theoretical *** strain rate and pressure were approximately 10^(7) s^(−1) and 5.07-29.37 GPa,*** results showed that the TiZrNbV RHEA had a Hugoniot elastic limit of 4.12-5.86 GPa and a spall strength of 1.84-2.03 *** initial yield strength of the alloy showed a strong strain-rate dependence and could be described by the modified Zerilli-Armstrong model,while the phonon-damping effect was the main reason for its high strain-rate *** analysis showed that the dynamic deformation of the TiZrNbV RHEA was controlled by the dislocation slip,dislocation proliferation,intersection of the deformation bands,and grain *** analysis also showed that the intergranular,transgranular,and mixed-type cracks dominated the spall failure of the *** dynamic Hall-Petch effect and pinning from the lattice distortion led to high dynamic yield *** critical strain rate for the phonon drag effect was positively related to the relative atomic mass and local strain field of the *** the experimental loading range,the RHEA showed good structural stability,and simultaneously,the theoretical calculation method for the equation of state based on a cold-energy mixture could accurately predict its shock-response *** valence-electron concentration(VEC)had a direct effect on the shock-compression properties of the HEAs;higher VEC implied more difficulty in compressing the *** findings of this study provide insights into understanding the mechanical response characteristics of RHEAs under extreme conditions such as high-speed impact and ultrahigh strain-rate loading.
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