Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 65, Issue 10, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-022-1953-x
Keywords
metallic glass; aging; rejuvenation; homogenous flow; free volume
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51971178]
- Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province [2021JC-12]
- Natural Science Foundation of Chongqing [cstc2020jcyj-jqX0001]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX2021015]
- NSFC [12072344]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Research Grant Council (RGC)
- Hong Kong government through the General Research Fund (GRF) [CityU11200719, CityU11213118]
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The research on aging and rejuvenation of metallic glasses during high-temperature deformation reveals that structural rejuvenation depends on ambient temperature and strain rate, rather than the initial structure.
High-temperature deformation has been demonstrated as an effective measure to rejuvenate and optimize the mechanical properties of metallic glasses (MGs). Clarifying the competition between aging and rejuvenation during high-temperature deformation is helpful in rejuvenating MGs accurately. Signatures of aging and rejuvenation in a La30Ce30Ni10Al20Co10 MG were investigated via high-temperature deformation and mechanical relaxation. The coupling of thermal history, aging, and mechanical disordering determines the transient deformation and the structural state of MGs. The stress overshoot and anelastic deformation induce structural rejuvenation, increasing the concentration of defects and erasing thermal history. Therefore, the eventually steady-state condition is dependent on ambient temperature and strain rate instead of the initial structure. Furthermore, the one-to-one relationship between defect concentration and strain rate clarifies the structural nature of rejuvenation in amorphous materials. Such a relationship also contributes toward a comprehensive understanding of the structural rejuvenation behavior in amorphous materials.
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