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Abstract
The CoCrFeMnNi high entropy alloys remain an active field over a decade owing to its excellent mechanical properties. However, the application of CoCrFeMnNi is limited because of the relatively low tensile strength. Here we proposed a micromechanical model which adopted from the theory of dislocation density to investigate the strengthening mechanisms of precipitation of chromium-rich non-equiatomic CoCrFeMnNi alloy. The microstructures of CoCrFeMnNi were obtained directly from SEM-BSE images with different annealing temperatures. The proposed framework is validated by comparing simulations with experiments of uniaxial tensile tests on the CoCrFeMnNi alloys under different annealing temperatures. The stress–strain curves indicate that the precipitate has greater influence on post-yield hardening than the initial yielding strength. In addition, we identified that the particle distribution, controlled by the average size of the particle and the volume fraction of precipitation, can significantly enhance the strengthening effect. The numerical results indicate that HEAs with a precipitate distribution closer to a normal distribution and with smaller average size will tend to have higher strength and ductility.
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1 Chung Yuan Christian University, Department of Civil Engineering, Taoyuan City, Taiwan (GRID:grid.411649.f) (ISNI:0000 0004 0532 2121)
2 National Cheng Kung University, Department of Civil Engineering, Tainan City 701, Taiwan (GRID:grid.64523.36) (ISNI:0000 0004 0532 3255)
3 National Cheng Kung University, Department of Engineering Science, Tainan City, Taiwan (GRID:grid.64523.36) (ISNI:0000 0004 0532 3255)
4 National Yang Ming Chiao Tung University, Department of Materials Science and Engineering, Hsinchu, Taiwan (GRID:grid.260539.b) (ISNI:0000 0001 2059 7017)
5 National Central University, Department of Mechanical Engineering, Taoyuan, Taiwan (GRID:grid.37589.30) (ISNI:0000 0004 0532 3167); National Central University, Institute of Material Science and Engineering, Taoyuan, Taiwan (GRID:grid.37589.30) (ISNI:0000 0004 0532 3167)
6 National Cheng Kung University, Department of Civil Engineering, Tainan City 701, Taiwan (GRID:grid.64523.36) (ISNI:0000 0004 0532 3255); National United University, Department of Civil and Disaster Prevention Engineering, Miao-Li, Taiwan (GRID:grid.412103.5) (ISNI:0000 0004 0622 7206)