| About this Abstract |
| Meeting |
2011 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses VIII
|
| Presentation Title |
Topological and Chemical Order in Liquids and Glasses – Influence on Phase Transitions |
| Author(s) |
Ken Kelton |
| On-Site Speaker (Planned) |
Ken Kelton |
| Abstract Scope |
Recent studies have demonstrated significant short- and medium-range chemical and topological order in liquid alloys; some examples are discussed. Quantitative measurements of the time-dependent nucleation rate in a metallic glass (Zr59Ti3Cu20Ni8Al10) and associated structural studies of the supercooled liquid show that icosahedral short-range order grows significantly on supercooling and likely contributes to the glass transition. Recent studies of liquid Zr80Pt20 demonstrate medium-range order at temperatures even above the melting temperature, suggesting that it is important in liquid solidification and glass formation in this alloy. Abrupt chemical ordering is observed in supercooled liquid Cu46Zr54 near 850oC; it is correlated with a specific heat maximum, which yields information about the change in energy of the liquid with ordering. Nanoscale phase separation in Al88Y7Fe5 glass explains the poor glass stability and the high crystal nucleation rates. |
| Proceedings Inclusion? |
Undecided |