|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Tailoring Crystallization Pathways of Metallic Glass Nanorods via Nucleus Starvation
||Sungwoo Sohn, Yujun Xie, YeonWoong Jung, Jan Schroers, Judy J. Cha
|On-Site Speaker (Planned)
Metallic glasses (MGs) are known for their sluggish crystallization kinetics, which provides unique advantages. For example, thermoplastic formability of MGs has been further extended to develop a nanomolding technique, enabling deeper investigation on crystallization and wider applications. However, crystallization mechanisms at the nanoscale are mostly unveiled due to technical difficulties, such as limitations in fabricating suitable nano-scale samples and in finding proper tools that provide sufficient resolution. Here, we show unexpected crystallization phenomena at the nanoscale, which significantly deviate from the classical-framework. By controlling the sample size and the crystallization kinetics of MG nanorods, we can tune the nuclei population and tailor the resulting crystallization phases from the expected to a new phase (for rods with diameters below ~35 nm). This is revealed by direct observation of crystallization processes using in situ TEM. Based on our results, we coin the term nucleation starvation as a strategy to tailor crystallization phases.
||Planned: Supplemental Proceedings volume