Rejuvenation of La-based metallic glass by controlling different modes of relaxation

Metallic glasses (MGs) have multiple dynamic relaxation modes, among which α and β relaxations are two typical modes. The rejuvenation of MGs usually refers to the increase in the total enthalpy of structural relaxation. However, the control mechanism of single-mode relaxation and the contributions...

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Bibliographic Details
Published in:Scripta materialia 2025-02, Vol.256, p.116418, Article 116418
Main Authors: Yang, Yifan, Geng, Jing, Cao, Yunwei, Fan, Li, Shi, Bo
Format: Article
Language:English
Subjects:
Metallic glass
Stress field
Structural relaxation
Temperature field
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Summary:Metallic glasses (MGs) have multiple dynamic relaxation modes, among which α and β relaxations are two typical modes. The rejuvenation of MGs usually refers to the increase in the total enthalpy of structural relaxation. However, the control mechanism of single-mode relaxation and the contributions of different relaxation modes to the total enthalpy are still unclear. We investigated the effects of stress, temperature and their coupling fields on α and β relaxations through experimental and molecular dynamics (MD) simulations. We found that the temperature field activated more sites for β relaxation, while the prolonged stress leads to the aggregations and connections of a quantity of localized atomic clusters and even activates α relaxation. The coupled field integrates the characteristics of stress and temperature fields and results in a clear splitting of α and β relaxations. Our work provides useful insights into the single-mode regulation of α and β relaxations in MGs. [Display omitted]
ISSN:1359-6462
DOI:10.1016/j.scriptamat.2024.116418