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dynamic compression behavior of TiZrNbV refractory high-entropy alloys upon ultrahigh strain rate loading

Journal of Materials Science & Technology 2023年第30期161卷 201-219页

作者： Kerong Ren Hongyang Liu Rong Ma Sen Chen Siyuan Zhang Ruixin Wang Rong Chen Yu Tang Shun Li Fangyun Lu College of Sciences National University of Defense TechnologyChangsha 410008China Aviation Maintenance NCO Academy Air Force Engineering UniversityXinyang 464001China The Peac Institute of Multiscale Sciences Chengdu 610031China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410008China

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.

关键词： Refractory high-entropy alloys Shock compression Spall dynamic yield Equation of state Ultrahigh strain rate

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