|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Structural Origin of Ultrastable Metallic Glasses
||Zhen Lu, Akihiko Hirata, Mingwei Chen
|On-Site Speaker (Planned)
Ultra-stable metallic glasses, fabricated by high-temperature physical vapor deposition, possess superior thermodynamic and kinetic stability. However, the structural origins of the unique glass state have not been well explored. Here we report that the outstanding thermodynamic and kinetic stability of an ultra-stable ZrCu metallic glass originates from ubiquitous crystal-like medium range order with well-defined local translational symmetry beyond nearest neighbors. The crystal-like order significantly improves the kinetic stability of the glass and the thermodynamic stability of its supercooled liquid, which is in opposition to the conventional wisdom that crystal-like order deteriorates the stability and forming ability of glasses. This study unveils the structural origin of ultrastable metallic glasses and shines insights into the intrinsic correlation of local atomic order with kinetic properties and glass transition of metallic glasses.
||Characterization, Mechanical Properties, Modeling and Simulation