Effect of dislocation configuration on Ag segregation in subgrain boundary of a Mg-Ag alloy

Interfacial segregation has been reported to play a critical role in the thermal-mechanical stability of nanocrystalline Mg alloys. Here we report Ag-segregation-assisted formation of nanocrystalline Mg-Ag alloy with high proportion of sub-grain boundaries during conventional rolling. The segregation structure is determined by dislocation configurations and subsequent strain field and misorientation of the subgrain boundary. It indicates that the alloying elements, which induce < c+ a > dislocations, would help to improve the stability of interfaces. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

Interfacial segregation, particularly with the assistance of Ag, can enhance the thermal-mechanical stability of nanocrystalline Mg alloys by promoting the formation of a high proportion of sub-grain boundaries during conventional rolling. The segregation structure is influenced by dislocation configurations and strain fields, which ultimately contribute to improving the stability of interfaces.