Dislocation-assisted linear complexion formation driven by segregation

TL;DR

This study uses atomistic simulations to explore how Ni segregation at dislocations in Fe-Ni alloys leads to the formation of linear complexions and precipitates, revealing critical conditions for these phenomena.

Contribution

It introduces atomistic simulation insights into dislocation-assisted linear complexion formation driven by segregation in Fe-Ni alloys.

Findings

Ni segregation induces precipitation of B2-FeNi and L10-FeNi phases.

Stable nanoscale precipitate arrays form under certain conditions.

Critical composition and temperature thresholds for complexion formation are identified.

Abstract

Atomistic simulations are used to study linear complexion formation at dislocations in a body-centered cubic Fe-Ni alloy. Driven by Ni segregation, precipitation of the metastable B2-FeNi and stable L10-FeNi phases occurs along the compression side of edge dislocations. If the Ni segregation is not intense enough to ensure precipitate growth and coalescence along the dislocation lines, linear complexions in the form of stable nanoscale precipitate arrays are observed. Critical conditions such as global composition and temperature are defined for both linear complexion formation and dislocation-assisted precipitation.