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Linear Complexions: Metastable Phase Formation and Coexistence at Dislocations
Vladyslav Turlo1, Timothy J Rupert1,2
1Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697, USA.
Abstract:
The unique three-phase coexistence of metastable B2-FeNi with stable L1_{0}-FeNi and L1_{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.
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