Anomalous Effect of Lattice Misfit on the Coarsening Behavior of Multicomponent L12 Phase

Abstract

The multicomponent L12 phase in high entropy alloys (HEAs) has shown excellent thermal stability, but understandings on its intrinsic origins are limited to the Lifshitz-Slyozov-Wagner (LSW) theories. In the present study, we investigated the influence of lattice misfit, which is not considered in LSW theory, on the coarsening kinetics of the multicomponent L12 phase. Different from those in most traditional alloys, the coarsening constants of multicomponent L12 particles decrease with the increasing lattice misfit in HEAs. This finding provides a new view for understanding the sluggish coarsening kinetics of L12 phase in HEAs.