Abstract
The present research was conducted on the bcc Cr-rich precipitation kinetics in a heavily deformed CoCrFeNiMn HEA. Activation energy calculation of ~ 226 kJ.mol−1 suggests that precipitation is controlled by grain boundary diffusion of Ni during post deformation annealing using Johnson–Mehl–Avrami–Kolmogorov equation. This value is smaller than the activation energy for the diffusion of Co, Cr, Fe, Ni and Mn in homogenized CoCrFeNiMn HEA. It can be due to the large number of defects such as dislocations and non-equilibrium grain boundaries which serve both as fast diffusion pathways and also as preferential nucleation sites for the formation of new phases.
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