Entropy-Induced Transition on Grain-Boundary Migration in Multi-Principal Element Alloys

In-depth understanding of grain boundaries (GBs) in multi-principal element alloys (MPEAs) is significant for designing MPEAs by GB engineering. This work explores the nanoscale GB structure and migration mechanism in MPEAs using atomic simulations. The GB-roughening transformation is observed as the mixing entropy increases, and the effect of entropy is confirmed by thermodynamic analysis. The entropy-induced transition of GB migration is...