|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Synchrotron X-ray Diffraction of Metallic Glass Rejuvenated under Triaxial Compression
||Nikolaos Panagiotopoulos, Konstantinos Georgarakis, Yi Li, Alan Lindsay Greer
|On-Site Speaker (Planned)
Metallic glasses (MGs) show extraordinary mechanical properties such as high strength and high elastic limit (on the order of 2%) but they lack ductility. One way to improve the ductility of MGs is to ‘rejuvenate’ the amorphous structure, reaching states of higher enthalpy. MGs plastically deformed under triaxial compression can undergo extreme structural rejuvenation. Calorimetric measurements suggest that the highest degree of rejuvenation achieved is equivalent to a casting cooling rate of 1010 K s‒1, and transmission electron microscopy confirmed that significant structural changes can be achieved. The present work extends such studies by using synchrotron X-ray diffraction to map the structural changes across sections of processed bulk MG rods. Measurements of strain parallel and perpendicular to the rod axis reveal complex patterns that reflect both elastic deformation and changes in MG structure. These patterns provide insight into the rejuvenation process activated by the triaxial compression method.