A thermokinetic description of nano-scale grain growth under dynamic grain boundary segregation condition

Under the dynamic grain boundary (GB) segregation state, an important thermokinetic transition stage between solute segregation and precipitation was considered. The thermokinetic model for nano-scale grain growth was extended by incorporating mixed effects of GB energy, activation energy and Zener drag. The application of the model in Fe–Cr and Nano-Fe alloys showed that formation of precipitation could accelerate the increase of GB energy and decrease of activation energy and finally induce to the second grain growth and second stabilization.