|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||High-resolution transmission electron microscopy study of rejuvenation in bulk metallic glasses
||Iurii Ivanov, Lindsay A. Greer
|On-Site Speaker (Planned)
Even for a single composition, bulk metallic glasses (BMGs) offer access to a wide range of structures and properties. There is particular interest in rejuvenation of BMGs to higher-energy states, as this improves their plasticity; lack of ductility impedes the wider exploitation of BMGs. Rejuvenation methods include: fast re-quenching, elastostatic loading, heavy plastic deformation, and cryothermal cycling (of particular interest as an easily applied, shape-preserving method). Characterization of these structural changes remains challenging. We present methods by which BMG rejuvenation can be characterized by transmission electron microscopy (TEM): electron diffraction (ED), and aberration-corrected high-resolution TEM (HRTEM). We focus on rejuvenated Zr-based BMGs. ED provides information on the average volume per atom and on characteristic features of the short-range and medium-range order (SRO and MRO) at the microscale. In complement to this, HRTEM allows extraction of such information locally (at nanoscale) with atomic resolution.
||Characterization, Other, Other