Manipulation of relaxation processes in a metallic glass through cryogenic treatment
Zhang, N. Z. 1Bian, X. L. 1Ren, C. 1Geng, C. 1Mu, Y. K. 1Ma, X. D. 1Jia, Y. D. 1Wang, Q. 1Wang, G.1
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作者信息
1. Shanghai Univ
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Abstract
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.
NSTL
Elsevier