Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.105701
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Funding
- National Science Foundation of China [NSFC 51601064]
- Fundamental Research Funds for the Central Universities [2018KFYXKJC009]
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division [DE-AC02-07CH11358]
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Relaxation processes significantly influence the properties of glass materials. However, understanding their specific origins is difficult; even more challenging is to forecast them theoretically. In this study, using microseconds molecular dynamics simulations together with an accurate many-body interaction potential, we predict that an Al90Sm10 metallic glass would have complex relaxation behaviors: In addition to the main (alpha) relaxation, the glass (i) shows a pronounced secondary (beta) relaxation at cryogenic temperatures and (ii) exhibits an anomalous relaxation process (alpha(2)) accompanying alpha relaxation. Both of the predictions are verified by experiments. Computational simulations reveal the microscopic origins of relaxation processes: while the pronounced beta relaxation is attributed to the abundance of stringlike cooperative atomic rearrangements, the anomalous alpha(2) process is found to correlate with the decoupling of the faster motions of Al with slower Sm atoms. The combination of simulations and experiments represents a first glimpse of what may become a predictive routine and integral step for glass physics.
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