| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure-Property Relationships of Bulk Metallic Glasses
|
| Presentation Title |
The L–G Phase Transition in Binary Cu–Zr Metallic Liquids |
| Author(s) |
Qi An, Yidi Shen, William Johnson, Konrad Samwer, Sydney Corona, William Goddard |
| On-Site Speaker (Planned) |
Qi An |
| Abstract Scope |
We recently found that undercooled liquid Ag and Ag-Cu alloys undergo a first-order phase transition from a homogenous liquid (L-phase) to a heterogenous solid-like (G-phase). This study extends these findings to liquid Cu-Zr bulk glass, identifying similar transitions and a heterogenous G-phase. Our results indicate this transition matches experimental observations in Vitreloy 1 and other Cu-Zr alloys. The G-phase of Cu-Zr is characterized by icosahedrally ordered cores, and a smaller heterogeneity length scale compared to Ag-Cu. This transition, linked with the emergence of elastic rigidity, influences the mechanical properties of the glass. The G-phase exhibits greater strength, rigidity, and critical stress and strain than the L-phase at room temperature. Both phases display plastic yielding through shear band formation; however, the G-phase is highly localized, while the L-phase is more homogenous. These findings suggest that the mechanical properties of metallic glasses depend on the specific glassy phase formed during processing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Phase Transformations |