|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Investigating the Structural Origin of the Change in Ductility of Zr-Cu-Co-Al Metallic Glasses Using 4-dimensional Scanning Transmission Electron Microscopy
||Soohyun Im, Pengyang Zhao, Yuchi Wang, Geun Hee Yoo, Eun Soo Park, Yunzhi Wang, Jinwoo Hwang
|On-Site Speaker (Planned)
The atomic structure of metallic glasses (MGs) may be inherently connected to the way shear transformation zones activate, but the details of such connection remain unclear. We investigate the medium-range ordering (MRO) and structural heterogeneity in Zr-Cu-Co-Al MGs that may directly correlate with the significant increase in ductility observed in that system. Angular correlation analysis and digital real-space reconstruction of the nanodiffraction acquired using 4-dimensional scanning transmission electron microscopy revealed that types of the MRO vary in 3 compositions, Zr45Cu50Al5, Zr55Co25Al20, and the mixture of the two, Zr50Cu25Co12.5Al12.5, with some of the MRO resembling the structural symmetry of stable intermetallic phases. Importantly, Zr50Cu25Co12.5Al12.5 shows smaller and more frustrated MRO structure, which may correlate with the substantially increased ductility in this composition. The result highlights why some MGs are intrinsically more ductile than others, which may provide important implications to designing the nanoscale structure to optimize the MGs’ properties.
||Characterization, Other, Other