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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Crystallography

Background:

  • Elastic stability governs material responses like melting, plasticity, and fracture in crystalline solids.
  • Previous studies focused on dislocation-mediated or defect accumulation-mediated amorphization.
  • High-entropy alloys (HEAs) present unique material properties due to their complex atomic structures.

Purpose of the Study:

  • To investigate elastic stability in high-entropy alloys (HEAs).
  • To characterize the mechanism of amorphization under tensile loading in HEAs.
  • To elucidate the relationship between local atomic environment and elastic strain-induced amorphization.

Main Methods:

  • In situ mechanical testing under tensile loading.
  • Atomic-resolution characterization using transmission electron microscopy (TEM).
  • First-principles calculations and atomic-resolution chemical mapping.

Main Results:

  • Observed sudden loss of lattice ordering (amorphization) in HEAs at approximately 10% elastic strain.
  • Identified a novel elastic strain-induced amorphization mechanism distinct from dislocation or defect-mediated processes.
  • Correlated amorphization with depressed dislocation nucleation, attributed to local atomic environment inhomogeneity in HEAs.

Conclusions:

  • Elastic strain-induced amorphization represents a new form of elastic instability in HEAs.
  • The findings highlight the critical role of local atomic environment inhomogeneity in HEA mechanical behavior.
  • Provides fundamental insights into elastic instability and incipient plasticity in advanced materials.