Linear Complexions: Metastable Phase Formation and Coexistence at Dislocations

Vladyslav Turlo and Timothy J. Rupert

Phys. Rev. Lett. 122, 126102 – Published 29 March 2019

Abstract

The unique three-phase coexistence of metastable $B 2 − FeNi$ with stable $L 1_{0} − FeNi$ and $L 1_{2} − {FeNi}_{3}$ is discovered near edge dislocations in body-centered cubic Fe-Ni alloys using atomistic simulations. Stable nanoscale precipitate arrays, formed along the compression side of dislocation lines and defined as linear complexions, were observed for a wide range of compositions and temperatures. By analyzing the thermodynamics associated with these phase transitions, we are able to explain the metastable phase formation and coexistence, in the process defining new research avenues for theoretical and experimental investigations.

Received 13 September 2018
Revised 5 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.126102

Physics Subject Headings (PhySH)

Disclinations & dislocations Interface & surface thermodynamics Line defects Phase transitions

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Vladyslav Turlo¹ and Timothy J. Rupert^1,2,*

¹Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697, USA
²Department of Materials Science and Engineering, University of California, Irvine, California 92697, USA