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Deformation-Induced Crystal Growth or Redissolution, and Crystal-Induced Strengthening or Ductilization in Metallic Glasses Containing Nanocrystals

  • 0Materials Science Program, Oregon State University, Corvallis, OR 97331, USA.
Materials (basel, Switzerland) +

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June 19, 2024

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June 19, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Crystal size in metallic glasses (MGs) inverts their mechanical properties. Small crystals increase strength, while larger ones enhance ductility, offering new design possibilities for MG composites.

Area Of Science

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background

  • Metallic glasses (MGs) typically show reduced strength with increased ductility upon crystal incorporation.
  • Deformation in MGs, especially shear banding, can trigger crystal formation or growth.

Purpose Of The Study

  • To investigate the influence of crystal size on the mechanical properties and deformation behavior of nanocrystal-bearing metallic glasses.
  • To determine if established trends in MG-crystal interactions are size-dependent.

Main Methods

  • Conducting molecular dynamics simulations of tensile tests on metallic glasses containing nanocrystals.
  • Analyzing the interplay between crystal size, shear bands, and mechanical property evolution during deformation.

Main Results

  • Small crystals (< shear band size) enhance MG strength and dissolve within propagating shear bands.
  • Larger crystals (> shear band size) improve ductility at the expense of strength, with increased crystal volume fraction during deformation.

Conclusions

  • The relationship between crystals and deformation in MGs is size-dependent, potentially inverting known trends.
  • Understanding crystal size effects is crucial for tailoring the mechanical properties of metallic glasses and their composites.

Keywords:

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