|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||Direct Investigation of Crystallization of Metallic Glass Nanostructures Using In Situ TEM
||Sung Woo Sohn, Yeonwoong Jung, Yujun Xie, Chinedum Osuji, Jan Schroers, Judy Cha
|On-Site Speaker (Planned)
Nanoscale metallic glasses combine the attractive mechanical properties of metallic glasses such as high elasticity and high fracture toughness with large surface areas, widening their applications ranging from catalysts to bioimplants. Despite the successful development of nanomanufacturing processes such as thermoplastic formation, reliable fabrication of metallic glass nanostructures of arbitrary compositions and shapes remains challenging. To improve the processing of nanoscale metallic glasses, crystallization at the nanoscale must be understood. We directly investigate nucleation and crystallization of metallic glass nanorods by heating individual nanorods inside a transmission electron microscope, in situ. We uncover several unexpected crystallization phenomena, all driven by the nanoscale confinement. We directly show that the crystallization characteristics deviate significantly at the nanoscale below ~ 30 nm compared to the bulk samples. In this talk, I will highlight these marked differences, which include increase in crystallization temperature, slowed grain growth, and single-phase crystallization.
||Planned: A print-only volume