Phase separation promotes FCC-phase mechanical twinning in AlCoCrFeMo0.05Ni2 high entropy alloy

Zifeng ZHANG; Liang CHU; Jiqing ZHAO; Bing XU; Qilu YE

doi:10.55713/jmmm.v34i3.2107

Authors

Zifeng ZHANG Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China
Liang CHU School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
Jiqing ZHAO Institute for Special Steels, China Iron and Steel Research Institute Group, Beijing 100081, China
Bing XU Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China
Qilu YE Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China

DOI:

https://doi.org/10.55713/jmmm.v34i3.2107

Keywords:

high entropy alloy, annealing, twin, deformation and fracture, high-temperature

Abstract

The AlCoCrFeMo_0.05Ni₂ high entropy alloy (HEA) can remarkably enhance its ductility through high-temperature annealing. Nevertheless, the underlying mechanism remains under explored. Herein, we utilized molecular dynamics simulations (MD) to calculate the generalized stacking fault energy (GSFE) curves and uniaxial tensile behavior. Notably, the twin inclination of the FCC phase increases significantly after annealing. During plastic deformation, the FCC phase in the annealed alloy exhibits a substantially higher formation of twinning and stacking faults compared to the as-cast alloy. This increased twin inclination after annealing is the fundamental mechanism contributing to the enhancement of high-temperature ductility.

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