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- Title
Recovery and Grain Growth Behavior of CoCrFeMnNi High Entropy Alloy.
- Authors
Li, Guojun; Lu, Fei; Li, Gen; Zhang, Guopeng; Shi, Yunjia; Huang, Hai; Wang, Jiefang; Cai, Bin
- Abstract
Single FCC CoCrFeMnNi with a mass of 1 kg was fabricated by vacuum levitation melting + casting. Lattice distortion caused by cold-rolling (CR) increases with thickness reduction ratio R (20%, 40%, 60% and 80%) and decreases in subsequent annealing. The recovery at 923–1023 K and grain growth at 1073–1273 K is systematically investigated. Nonlinear fitting methods are applied to study the recovery and grain growth kinetics, in which the equilibrium microhardness at a definite recovery temperature and initial grain size before the onset of grain growth are required to be fitted. The recovery activation energies of 60% and 80% CRed alloys are 148.91 kJ/mol and 155.1 kJ/mol, respectively, while the fitted equilibrium microhardness decreases with increasing T. Although satisfactory nonlinear fitted results of dn ~ 1/T curves, where d is grain size, can be obtained for both n = 2 and 3, the classic mechanism with n = 2 and lower activation energy (254 kJ/mol) are mainly responsible for grain growth. In all, the recovery at 923–1023 K is caused by dislocation (viscous) slide while the grain growth at 1073–1273 K can be mainly controlled by GB migration.
- Subjects
ACTIVATION energy; COLD rolling; ENTROPY; GRAIN size; MICROHARDNESS; ALLOYS
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 11, p4271
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05436-4