Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 150, Issue 20, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5094825
Keywords
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Funding
- National Science Foundation of China [NSFC 51601064]
- National Thousand Young Talents Program of China
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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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