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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Physical Chemistry

Background:

  • MAX phases undergo diverse phase transformations under extreme environments like irradiation.
  • Some MAX phases transform from hexagonal to gamma (γ) phase, then to face-centered cubic (fcc), while others become amorphous.
  • Mechanisms and compositional influences on these transformations remain poorly understood.

Purpose of the Study:

  • To elucidate the distinct transformation pathways and energetics of the γ-to-fcc transformation in MAX phases.
  • To understand the role of composition in MAX phase irradiation response.
  • To develop a generalized rule for predicting MAX phase transition behaviors.

Main Methods:

  • In situ ion irradiation experiments.
  • Transmission electron microscopy (TEM) for structural analysis.
  • Density-functional theory (DFT) calculations for energetic analysis.

Main Results:

  • Demonstrated distinct transformation pathways for the γ-to-fcc transition in various MAX phases.
  • Identified structural distortion and bond covalency in the γ-phase as key determinants of transformation outcome.
  • Established a generalized rule predicting phase transition behavior based on atomic radii and electronegativity.

Conclusions:

  • The study provides a comprehensive understanding of MAX phase transformation mechanisms under irradiation.
  • The developed predictive rule aids in designing MAX phase materials for extreme environments.
  • Insights into multi-stage phase transformations are crucial for related complex materials in harsh conditions.