Impacts of atomic scale lattice distortion on dislocation activity in high-entropy alloys

The concept of high-entropy alloys (HEAs) introduces a new path of developing advanced materials with unique properties, among which excellent mechanical properties have attracted intensive interests. Lattice distortion was believed to contribute to the excellent mechanical properties of HEAs. However, it is not known that how atomic scale lattice distortion impacts dislocation behavior in HEAs. By performing large-scale molecular dynamic simulations, we demonstrate that local lattice distortion leads to considerable variation of dislocation dissociation width and introduces energy barriers strongly against dislocation motion, which significantly affect dislocation activity in HEAs.