|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Crystallization of a Au-based Bulk Metallic Glass: Influence of the Initial Glassy State
||Owain Houghton, Yurii Ivanov, A. Lindsay Greer
|On-Site Speaker (Planned)
On heating, a bulk metallic glass (BMG) first enters the supercooled-liquid region, and then crystallizes. Conventionally, the state of the BMG is considered irrelevant for crystallization; the supercooled liquid has no ‘memory’ of the initial glass. The Au49Pd2.3Ag5.5Cu26.9Si16.3 BMG chosen for the present work has been very widely studied, not least because this composition can be melted and revitrified in fast differential scanning calorimetry (FDSC) – this allows characterization immediately after glass formation. These studies show clearly that (contrary to the conventional view) the state of the BMG does affect the crystallization. We use FDSC, HRTEM and STEM characterization to extend the published studies and explore how changes to the glassy state (the extent of α and β relaxation and embedded crystalline nuclei) can affect the crystallization upon heating. The findings are relevant not only for metallic, but also for silicate and perhaps other, glassy systems.
||Phase Transformations, Characterization,