[en] This study employs molecular dynamics (MD) simulations to examine materials with comparable tension-compression behavior but markedly different cyclic fatigue performances. The findings reveal that the cyclic fatigue properties of AlCoCrCuFeNi high-entropy alloys (HEAs) are primarily governed by microscopic deformation mechanisms, particularly dislocation slip modes, which subtly affect initial work hardening. However, the slight initial differences in work hardening affected by the butterfly and Bauschinger effects gradually accumulate and intensify with repeated fatigue cycling. As the number of loading cycles increases, β-asymmetry steadily declines. Interactions between partial dislocations and stacking faults (SFs) at lower temperatures disrupt the lattice structure and impede dislocation reversal, thereby diminishing the Bauschinger effect. This mechanism contributes to marked variations in fatigue life and cyclic stress response.
Disciplines :
Materials science & engineering
Author, co-author :
Nguyen, Hoang-Giang; Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan ; Department of Electronic Engineering, National United University, Miaoli City, Taiwan ; Faculty of Engineering, Kien Giang University, Viet Nam
Young, Sheng-Joue; Department of Electronic Engineering, National United University, Miaoli City, Taiwan
LE, Thanh-Dung ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Vu, Thi-Nhai; Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan ; Faculty of Mechanical Engineering, Nha Trang University, Viet Nam
Fang, Te-Hua ; Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan ; Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung, Taiwan
External co-authors :
yes
Language :
English
Title :
Bauschinger effect on high entropy alloy under cyclic deformation
The authors acknowledge the support by the National Science and Technology Council, Taiwan, under grant numbers NSTC 113-2221-E-992-067-MY3, NSTC 113-2811-E239-002, and Industry Cooperation Project no. 113A00262.
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