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<p>A unique global strain approach based on the transition state theory was proposed to quantify the creep-recovery processes of metallic glasses, in which the structure of glasses is predominantly governed by the macroscopic strain. This methodology allows for the calculation of strain-dependent activation energy and activation volume for flow defects. The activation energy and volume of creep both increase linearly with the magnitude of strain. Upon the glass-to-liquid transition, they get large and strain-independent, which serves as a signature of the glass transition. During creep recovery, the cooperation of deformation units increases the activation volume but decreases activation energy due to the decrease in free volume. Notably, only a fraction of the anelasticity accumulated during creep persists in the recovery process; the rest is suppressed by structural relaxation. The results introduce physical insights into the deformation and relaxation of metastable solids that are not available in the usual rate-dependent theory developed for crystal plasticity.</p>

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Creep and recovery behavior of metallic glasses in a global strain approach within transition state theory

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Langting Zhang,
  • Yajuan Duan,
  • Yunjiang Wang,
  • Eloi Pineda,
  • Yong Yang,
  • Jean-Marc Pelletier,
  • Takeshi Wada,
  • Hidemi Kato,
  • Daniel Crespo,
  • Jichao Qiao

摘要

A unique global strain approach based on the transition state theory was proposed to quantify the creep-recovery processes of metallic glasses, in which the structure of glasses is predominantly governed by the macroscopic strain. This methodology allows for the calculation of strain-dependent activation energy and activation volume for flow defects. The activation energy and volume of creep both increase linearly with the magnitude of strain. Upon the glass-to-liquid transition, they get large and strain-independent, which serves as a signature of the glass transition. During creep recovery, the cooperation of deformation units increases the activation volume but decreases activation energy due to the decrease in free volume. Notably, only a fraction of the anelasticity accumulated during creep persists in the recovery process; the rest is suppressed by structural relaxation. The results introduce physical insights into the deformation and relaxation of metastable solids that are not available in the usual rate-dependent theory developed for crystal plasticity.