|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||Structural Evolution of Liquid Eutectic GaIn Alloy using In Situ Synchrotron X-ray Diffraction and Ab Initio Molecular Dynamics Simulation
|| , Qing Yu, X.D. Wang, Q.P. Cao, D.X. Zhang
|On-Site Speaker (Planned)
To gain structural changes in metallic liquids, the liquid eutectic Ga85.8In14.2 alloy with melting temperature of 288.65 K is studied using in situ synchrotron radiation x-ray diffraction combined with ab initio molecular dynamics (AIMD) simulation. A jump occurs in a temperature range of 350-550 K from thermal expansion curves of the liquid measured by dilatometer. This is also detected by changes in the first peak positions of pair correlation functions and structure factor. The nearest-neighbor interatomic distance increases with decreasing temperature. AIMD calculations reveal that low-coordinated polyhedra tend to evolve into high-coordinated ones during cooling. The coordination number starts to change abnormally at the vicinity of 550 K associated with atomic rearrangement in polyhedral clusters. All these results suggest that a liquid-liquid crossover indeed occurs at the temperature interval of 350-550 K prior to the onset of crystallization in the liquid eutectic GaIn alloy.
||Planned: A print-only volume