期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 154, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2022.103288
关键词
Metallic glass; Stress relaxation; Creep; Non-elastic deformation
资金
- NSFC [12072344]
- Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province [2021JC-12]
- MICINN [PID2020-112975GB-I00]
- Generalitat de Catalunya [2017SGR0042]
- Hong Kong government through the General Research Fund (GRF) [CityU11200719, CityU11213118]
- Research Grant Council (RGC)
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
Due to the disordered arrangement of atoms and deviation from thermodynamic equilibrium, the physical and mechanical properties of metallic glasses can change with time, temperature, and strain or stress. This study presents a theoretical framework based on the hierarchically correlated atomic theory, allowing for a quantitative description of the non-elastic deformation in metallic glasses.
Due to the structurally disordered arrangement of atoms and deviation from thermodynamic equilibrium, the physical and mechanical properties of metallic glasses can vary with time, temperature and magnitude of strain or stress. The current work provides a theoretical framework based on the hierarchically correlated atomic theory, which allows a quantitative description of the non-elastic deformation in metallic glasses. The defect concentration is adopted as an order parameter, which can evolve with temperature and non-elastic strain owing to correlated atomic movements. Through our hierarchically correlated atomic theory, we derive the characteristic times for local shear events in metallic glasses that entail activation, growth and/or annihilation of flow defects, which however are not accounted for in the previous mean field theories. Finally, we demonstrate that the current theoretical framework can be validated by the stress relaxation and creep experiments on typical La-based metallic glasses, which in turn provides quantitative insights into the non-elastic deformation mechanisms in metallic glasses.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据