Effect of temperature and strain rate on compression properties of forged Al_0.5CoCrFeNi high entropy alloy

TY - JOUR

T1 - Effect of temperature and strain rate on compression properties of forged Al0.5CoCrFeNi high entropy alloy

AU - Yu, Lan

AU - Li, Siyu

AU - Yan, Pei

AU - Dai, Zhicheng

AU - Song, Yifan

AU - Gao, Shoufeng

AU - Sun, Jie

AU - Cai, Zhihai

AU - Wang, Xibin

N1 - Publisher Copyright: © 2026 Elsevier B.V.

PY - 2026/6

Y1 - 2026/6

N2 - To facilitate the processing, manufacturing, and application of AlxCoCrFeNi high entropy alloys (HEAs), The dynamic compressive mechanical properties of forged Al0.5CoCrFeNi dual-phase high entropy alloy under high temperature and high strain rate conditions and material model suitable for cutting are investigated. Compression tests are conducted on the alloy within a wide range of strain rates (10−3-8000 s−1) and temperatures (25°C-800 °C). The results show that the material exhibits strain hardening, strain rate hardening, and thermal softening effects. The deformed specimens after compression display characteristics of severe plastic deformation. Microscopically, there is a mismatch in the deformation between the face-centered cubic (FCC) matrix phase and the body-centered cubic (BCC) phase. The quasi-static high-temperature deformation is dominated by thermal activation, with dislocations bypassing the grain boundaries and inducing discontinuous dynamic recrystallization. While dynamic compression is controlled by phonon damping, the superposition of high temperature and adiabatic temperature rise significantly enhances thermal softening, resulting in obvious deformation localization bands induced by the BCC phase, reflecting the critical state before material failure. The Johnson-Cook (J-C) constitutive model, widely used in cutting simulation, is fitted, and the average relative error of the flow stress fitting is within 15%. Based on this, a finite element model for the cutting simulation of Al0.5CoCrFeNi high entropy alloy was established. The cutting force error was within 10%, and the material mechanical properties were correlated with the macroscopic processing.

AB - To facilitate the processing, manufacturing, and application of AlxCoCrFeNi high entropy alloys (HEAs), The dynamic compressive mechanical properties of forged Al0.5CoCrFeNi dual-phase high entropy alloy under high temperature and high strain rate conditions and material model suitable for cutting are investigated. Compression tests are conducted on the alloy within a wide range of strain rates (10−3-8000 s−1) and temperatures (25°C-800 °C). The results show that the material exhibits strain hardening, strain rate hardening, and thermal softening effects. The deformed specimens after compression display characteristics of severe plastic deformation. Microscopically, there is a mismatch in the deformation between the face-centered cubic (FCC) matrix phase and the body-centered cubic (BCC) phase. The quasi-static high-temperature deformation is dominated by thermal activation, with dislocations bypassing the grain boundaries and inducing discontinuous dynamic recrystallization. While dynamic compression is controlled by phonon damping, the superposition of high temperature and adiabatic temperature rise significantly enhances thermal softening, resulting in obvious deformation localization bands induced by the BCC phase, reflecting the critical state before material failure. The Johnson-Cook (J-C) constitutive model, widely used in cutting simulation, is fitted, and the average relative error of the flow stress fitting is within 15%. Based on this, a finite element model for the cutting simulation of Al0.5CoCrFeNi high entropy alloy was established. The cutting force error was within 10%, and the material mechanical properties were correlated with the macroscopic processing.

KW - AlCoCrFeNi high entropy alloy

KW - Deformation mechanisms

KW - Dynamic compression properties

KW - Johnson-Cook constitutive model

UR - https://www.scopus.com/pages/publications/105034734668

U2 - 10.1016/j.msea.2026.150194

DO - 10.1016/j.msea.2026.150194

M3 - Article

AN - SCOPUS:105034734668

SN - 0921-5093

VL - 962

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 150194

ER -