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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Structural relaxation affecting shear-transformation avalanches in metallic glasses.

Tomoaki Niiyama1, Masato Wakeda2, Tomotsugu Shimokawa3

  • 1College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.

Physical Review. E
|November 28, 2019
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Summary

Structural relaxation in metallic glasses influences avalanche behavior, leading to anisotropic event shapes and temporal clustering. This impacts shear localization and mechanical properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

Background:

  • Avalanche behaviors in amorphous plasticity follow power-law statistics and are crucial for mechanical properties of metallic glasses.
  • Structural relaxation's influence on these avalanches and shear localization is not fully understood.

Purpose of the Study:

  • To investigate how structural relaxation affects elementary avalanche behavior in metallic glasses.
  • To understand the relationship between relaxation, shear localization, and avalanche characteristics.

Main Methods:

  • Molecular-dynamics simulations of shear deformation tests on metallic glass models.
  • Comparison between less-relaxed (as-quenched) and well-relaxed (well-aged) glass models.
  • Analysis of power-law statistics, event sizes, and spatial correlation functions of atomic displacements.

Main Results:

  • Both relaxed and less-relaxed glasses exhibit power-law avalanche statistics but differ in maximum event sizes.
  • Well-relaxed glasses display shear localization and anisotropic avalanche regions.
  • Less-relaxed glasses show isotropic avalanche regions.
  • Temporal clustering in avalanche propagation direction emerges in well-relaxed glasses.

Conclusions:

  • Structural relaxation significantly alters elementary avalanche characteristics in metallic glasses, promoting shear localization and anisotropy.
  • A correlation exists between avalanche anisotropy and event size in well-relaxed metallic glasses.
  • Findings enhance understanding of amorphous plasticity and mechanical behavior of metallic glasses.