Interfacial strain relief by periodic dislocation doublets emerging from rotationally related orientation relationships of Y4Zr3O12 dispersions in ferrite matrix

TL;DR

This study investigates the crystallographic orientation relationships and interfacial strain relief mechanisms of Y4Zr3O12 dispersions in a ferrite matrix, revealing specific dislocation arrangements that minimize interface energy.

Contribution

It identifies two key orientation relationships and their associated dislocation doublets, expanding understanding of interface structures in Y4Zr3O12/bcc systems.

Findings

Two predominant ORs with periodic dislocation doublets identified

Eighteen feasible ORs deduced through stereographic analysis

The most frequent OR minimizes dislocation doublets at the interface

Abstract

The trigonal/bcc orientation relationships (ORs) and their likelihood of occurrence are extensively studied using dispersed Y4Zr3O12nano-precipitates in bcc Fe matrix by means of transmission electron microscopy, image simulations, and a crystallographic model. Two orientation relationships related by a rotation:[1-20]||[111] with (21-2)||(-110) and [1-20]||[111] with (00-3)||(-110), are established and periodic arrays of misfit dislocation doublets are identified at the strained interface in (110) for both ORs. Further eighteen energetically feasible ORs in Y4Zr3O12/bcc system are deduced by combining stereographic projections, which include the two predominant ORs in this study and other ORs in literature. The orientation relationship which generates the interface with a minimum number of dislocation doublets is the most frequent.