Taylor impact of high-entropy alloy Al0.1CoCrFeNi: Dynamic severe plastic deformation and bulk gradient structure

作者：Xu, J.; Liu, Q.; Xu, Y. F.; Guo, S. H.; Li, C.; Zhang, N. B.^*; Cai, Y.; Liu, X. Y.; Lu, L.^*; Luo, S. N.

来源：Journal of Alloys and Compounds, 2023, 936: 168261.

DOI：10.1016/j.jallcom.2022.168261

• Al0.1CoCrFeNi
• High-entropy alloy
• Taylor impact
• Bulk gradient structure

Taylor impact experiments are conducted on a typical face-centered cubic single-phase high-entropy alloy (HEA) Al0.1CoCrFeNi, to investigate its dynamic severe plastic deformation and gradient structure. Parameters of the Johnson-Cook constitutive model are obtained, and finite element modeling based on this model is consistent with the experimental observations. A bulk gradient structure with deformation gradient is generated directly via the Taylor impact. The deformation mechanisms include the {111}< 112 > deformation twins and kink bands with the < 110 > or < 112 > rotation axes, and vary considerably along the impact direction. Subsequent annealing at 800 degrees C and the impact-induced gradient in the degree of recrystallization lead to a new bulk gradient structure with gradients in grain size and proportion of the nonrecrystallized region, providing a novel approach to developing bulk gradient structured materials.

• 单位
  西南交通大学