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Formation of two glass phases in binary Cu-Ag liquid
Formation of two glass phases in binary Cu-Ag liquid
- Source :
- Acta Materialia. 195:274-281
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
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.
- Subjects :
- 010302 applied physics
Phase transition
Amorphous metal
Materials science
Polymers and Plastics
Metals and Alloys
Thermodynamics
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter::Disordered Systems and Neural Networks
01 natural sciences
Isothermal process
Electronic, Optical and Magnetic Materials
Condensed Matter::Soft Condensed Matter
Shear modulus
Metastability
Phase (matter)
0103 physical sciences
Ceramics and Composites
0210 nano-technology
Supercooling
Glass transition
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 195
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi.dedup.....8d3ace2c8ca7eccbc5aa96d9c4decd6c
- Full Text :
- https://doi.org/10.1016/j.actamat.2020.05.060