期刊
JOURNAL OF CHEMICAL PHYSICS
卷 150, 期 20, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.5094825
关键词
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资金
- National Science Foundation of China [NSFC 51601064]
- National Thousand Young Talents Program of China
Glassy materials are nonequilibrium and their energy states have crucial influences on properties. Recent studies have shown that oscillating deformations (vibrations) can cause either accelerated aging (lowering energy) or rejuvenation (elevating energy); however, the underlying atomic mechanisms remain elusive. Using metallic glasses (MGs) as model systems, we show that the vibration-induced accelerated aging is correlated with the strain field of the stringlike atomic motions stemming from the Johari-Goldstein (beta) relaxation, whereas the rejuvenation is associated with nonlinear response and the formation of nanoscale shear bands attributing to the activation of alpha relaxation. Both processes are affected by thermal fluctuations, which result in an optimal temperature for accelerated aging. These results suggest intrinsic correlations among relaxation dynamics, mechanical properties, and the vibration induced structural rearrangements in MGs. Published under license by AIP Publishing.
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