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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974316 and U2004167). We really appreciate the Center of Advanced Analysis & Gene Sequencing, Zhengzhou University for its equipment support.
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Li, G., Lu, F., Li, G. et al. Recovery and Grain Growth Behavior of CoCrFeMnNi High Entropy Alloy. JOM 74, 4271–4279 (2022). https://doi.org/10.1007/s11837-022-05436-4
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DOI: https://doi.org/10.1007/s11837-022-05436-4