Precipitation kinetics in heavily deformed CoCrFeNiMn high entropy alloy

The present research was conducted on the bcc Cr-rich precipitation kinetics in a heavily deformed CoCrFeNiMn HEA. Activation energy calculation of similar to 226 kJ.mol(-1) suggests that precipitation is controlled by grain boundary diffusion of Ni during post deformation annealing using Johnson-Mehl-Avrami- Kol mogorov 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. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The research investigated the bcc Cr-rich precipitation kinetics in a heavily deformed CoCrFeNiMn HEA, finding that the diffusion of Ni was controlled by grain boundaries, likely influenced by defects such as dislocations and non-equilibrium grain boundaries.