Role of interfaces on phase formation during severe plastic deformation

The role of interfaces on phase formation during severe plastic deformation (SPD) was investigated using molecular dynamics simulations. It is found that dilute solute additions that segregate to interphase boundaries, and strengthen them, can greatly extend the solubility limits of the bounding phases at steady state, providing a novel approach to processing nanocomposite alloys by SPD. The results are rationalized in terms of a modified effective temperature model, whereby increasing the interface strength leads to higher effective temperatures and correspondingly to higher solubilities. Comparison of the segregation coefficient at the interphase boundary with solubilities in the bounding phases illustrates the effective tem perature model is self-consistent and comprehensive. Past experimental studies on severe plastic deformation are found consistent with these observations. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

The role of interfaces in phase formation during severe plastic deformation (SPD) was investigated using molecular dynamics simulations. It was found that dilute solute additions that segregate to interphase boundaries can greatly extend the solubility limits of the bounding phases, providing a novel approach to processing nanocomposite alloys by SPD. The results were rationalized using a modified effective temperature model, which showed that increasing the interface strength leads to higher effective temperatures and higher solubilities.