期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 894, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162407
关键词
Relaxation processes; Mechanical properties; Cryogenic treatment; Metallic glasses
资金
- National Key Research and Development Program of China [2017YFB0701902]
- NSFC [51925103, 51827801, 51801027]
- 111 Project [D16002]
The relaxation spectrum of glassy solids has long been considered to probe their structural features and deformation mechanisms. By systematically investigating the structural evolution, dynamical relaxations, and mechanical properties of a Zr-based metallic glass, it was found that local excitations trigger β-relaxation with no memory effect of the thermal history or initial free volume content, while some local denser areas created by cryogenic treatment might contribute to β'-relaxation at a much lower energy, playing a crucial role in the fundamental deformation mechanisms of metallic glasses. These findings help advance understanding of the relationship between local excitations and mechanical properties, potentially guiding the development of high-performance amorphous alloys.
The relaxation spectrum of glassy solids has long been considered to probe their structural features and deformation mechanisms. Here, by systematically investigating the structural evolution, dynamical re-laxations and mechanical properties of a Zr-based metallic glass subjected to different cryogenic treatment time, we build a bridge to connect the relaxation processes and mechanical properties. It is found that the /3 -relaxation triggered by local excitations has no memory effect of the thermal history or initial free volume content of the system. However, some local denser areas with a high potential energy created by CT might contribute to /3 '-relaxation that activated at a much lower energy, which may play a crucial important role in the fundamental deformation mechanisms of metallic glasses. The relaxation behaviors and the related improved mechanical properties can be rationalized in terms of the atomic-level stress theory. These findings will advance our understanding of the intrinsic correlation between local excitations and me-chanical properties of metallic glasses, thereby may help guide to develop amorphous alloys with high mechanical performance. (c) 2021 Elsevier B.V. All rights reserved.
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