Formation of Two Glass Phases in Binary Cu-Ag Liquid
Abstract
The glass transition is alternatively described as either a dynamic transition in which there is a dramatic slowing down of the kinetics, or as a thermodynamic phase transition. To examine the physical origin of the glass transition in fragile Cu-Ag liquids, we employed molecular dynamics (MD) simulations on systems in the range of 32,000 to 2,048,000 atoms. Surprisingly, we identified a 1st order freezing transition from liquid (L) to metastable heterogenous solid-like phase, denoted as the G-glass, when a supercooled liquid evolves isothermally below its melting temperature at deep undercooling. In contrast, a more homogenous liquid-like glass, denoted as the L-glass, is achieved when the liquid is quenched continuously to room temperature with a fast cooling rate of ∼10¹¹ K/sec. We report a thermodynamic description of the L-G transition and characterize the correlation length of the heterogenous structure in the G-glass. The shear modulus of the G-glass is significantly higher than the L-glass, suggesting that the first order L-G transition is linked fundamentally to long-range elasticity involving elementary configurational excitations in the G-glass.
Additional Information
© 2020 Acta Materialia Inc. Published by Elsevier Ltd. Received 19 March 2020, Revised 23 May 2020, Accepted 25 May 2020, Available online 30 May 2020. Q. A. is supported by the US. Nuclear Regulatory Commission (NRC) under Grant No. NRCHQ-84–15-G-0028. W.L.J and S.C. are supported by NSF grant with the award number DMR 1710744. K.S. is supported by the DFG, grant Sa337/10. The authors declare no competing financial interests.Attached Files
Supplemental Material - 1-s2.0-S1359645420304079-mmc1.docx
Files
Name | Size | Download all |
---|---|---|
md5:912fd50d9441a42e83e781146ee4b798
|
2.4 MB | Download |
Additional details
- Eprint ID
- 103600
- Resolver ID
- CaltechAUTHORS:20200601-110249430
- Nuclear Regulatory Commission
- NRC-HQ-84-15-G-0028
- NSF
- DMR-1710744
- Deutsche Forschungsgemeinschaft (DFG)
- Sa337/10
- Created
-
2020-06-01Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Other Numbering System Name
- WAG
- Other Numbering System Identifier
- 1384