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Linear Complexions: Metastable Phase Formation and Coexistence at Dislocations.

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Atomistic simulations reveal a unique three-phase coexistence in body-centered cubic Fe-Ni alloys near edge dislocations. This discovery of stable nanoscale precipitate arrays opens new research avenues for Fe-Ni alloy investigations.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Materials Science

Background:

  • Body-centered cubic (BCC) Fe-Ni alloys are crucial in various industrial applications.
  • Understanding phase stability and transformations in Fe-Ni systems is essential for material design.
  • Dislocation cores significantly influence local atomic arrangements and phase behavior.

Purpose of the Study:

  • To investigate the phase behavior of Fe-Ni alloys near edge dislocations.
  • To identify and characterize unique phase coexistences under specific conditions.
  • To elucidate the thermodynamic driving forces behind observed phase transitions.

Main Methods:

  • Atomistic simulations were employed to model Fe-Ni alloy behavior at the atomic scale.
  • Analysis focused on regions near edge dislocations within the BCC Fe-Ni lattice.
  • Thermodynamic analysis was performed to understand phase transition mechanisms.

Main Results:

  • A unique three-phase coexistence was discovered: metastable B2-FeNi with stable L1_{0}-FeNi and L1_{2}-FeNi_{3}.
  • Stable nanoscale precipitate arrays, termed linear complexions, formed along the compression side of dislocation lines.
  • These observations were consistent across a wide range of Fe-Ni compositions and temperatures.

Conclusions:

  • The study explains the formation and coexistence of metastable phases in Fe-Ni alloys near dislocations.
  • The findings introduce the concept of linear complexions as stable nanoscale precipitate arrays.
  • This research opens new theoretical and experimental avenues for investigating Fe-Ni alloys and related systems.