期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.142621
关键词
Multi-principal element alloys; Back-stress hardening; Finite element method; Dislocation-based constitutive model
类别
资金
- National Research Foundation of Korea (NRF) [2016M3D1A102338, 2021R1A2C3006662]
- Ministry of Trade, Industry and Energy of Korea [20009793]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20009793] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2021R1A2C3006662] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The kinematic and isotropic hardening behavior of high and medium entropy alloys with a single-phase FCC structure was investigated. It was found that the cross-slip in FCC structures is influenced by fluctuations in the distribution of different atom species. The study used a solidsolution induced back-stress model to investigate the effects of dislocation forest stress and back-stress in a non-equiatomic medium entropy alloy.
The kinematic and isotropic hardening behavior was investigated for high and medium entropy alloys with a single-phase face-centered cubic (FCC) structure. The cross-slip associated with screw dislocations in FCC structures is strongly influenced by local fluctuations in the spatial distribution of different atom species. The local atomic arrangements inhibit the movement of Shockley partial dislocations during plastic deformation, thereby lowering the probability of cross-slip and generating a higher back-stress. This study used a solidsolution induced back-stress model, which combines nonlinear kinematic and isotropic hardening, to investigate the effects of dislocation forest stress and back-stress in a non-equiatomic Cr12Fe42Mn24Ni22 medium entropy alloy. Based on the experimental results, numerical simulations by the finite element method were performed to validate this modeling approach.
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