4.8 Article

Linear Complexions: Metastable Phase Formation and Coexistence at Dislocations

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PHYSICAL REVIEW LETTERS
卷 122, 期 12, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.126102

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  1. U.S. Department of Energy, Office of Basic Energy Sciences, Materials Science and Engineering Division [DE-SC0014232]
  2. U.S. Department of Energy (DOE) [DE-SC0014232] Funding Source: U.S. Department of Energy (DOE)

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The unique three-phase coexistence of metastable B2-FeNi with stable L1(0)-FeNi and L1(2)-FeNi3 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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