LIANG Shuyi; ZHANG Langting; ZHU Hangchen; XING Guanghui; QIAO Jichao

doi:10.7498/aps.74.20250392

Abstract

This study aims to establish the intrinsic link between the high-temperature rheological behavior and kinetic relaxation characteristics of La-based metallic glasses. By conducting dynamic mechanical analysis and high-temperature tensile strain-rate jump experiments on three La-based metallic glasses with significant β relaxation, and combining the findings within the free volume theory framework, their high-temperature rheological properties are investigated systematically. The results show that the steady-state flow stress and activation volume evolution trend are consistent within the normalized temperature range. The average activation energy for high-temperature rheology aligns with the activation energy range of α relaxation, confirming the strong association between rheological behavior and α relaxation. The activation energy for β relaxation shows an opposite trend, indicating that it may precede α relaxation. A dynamic competition between defect annihilation and generation governs the rheological behavior, and kinetic parameters reveal the temperature and strain-rate sensitivity of metallic glasses. This study lays a theoretical foundation for optimizing the high-temperature mechanical properties of La-based metallic glasses and also provides new insights into understanding the coupling relationship between multi-scale relaxation behavior and rheological mechanisms in metallic glasses.

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Corresponding author: QIAO Jichao, qjczy@nwpu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12472069, 52271153), the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University, China (Grant No. CX2024012), the China Association for Science and Technology (CAST) Youth Talent Support Program-Doctoral Student Special Project, and the Shaanxi Undergraduate Training Program on Innovation and Entrepreneurship, China (Grant No. S202310699565).

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Vol. 74, Issue 13 - 2025-07-05

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