TY - JOUR
T1 - Solid solution induced back-stress in multi-principal element alloys
T2 - Experiment and modeling
AU - Kim, Yongju
AU - Asghari-Rad, Peyman
AU - Lee, Jungwan
AU - Gu, Gang Hee
AU - Jang, Minji
AU - Bouaziz, Olivier
AU - Estrin, Yuri
AU - Kato, Hidemi
AU - Kim, Hyoung Seop
PY - 2022/2/17
Y1 - 2022/2/17
N2 - 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 solid-solution 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.
AB - 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 solid-solution 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.
KW - Back-stress hardening
KW - Dislocation-based constitutive model
KW - Finite element method
KW - Multi-principal element alloys
UR - http://www.scopus.com/inward/record.url?scp=85122635328&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2022.142621
DO - 10.1016/j.msea.2022.142621
M3 - Article
AN - SCOPUS:85122635328
SN - 0921-5093
VL - 835
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
M1 - 142621
ER -