About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Bulk Metallic Glasses XX
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Presentation Title |
Structural Symmetry of Medium Range Ordering in Metallic Glasses Revealed by Angular Correlation Analysis of 4D-STEM Nanodiffraction |
Author(s) |
Gabriel Calderon, Jiyoung Kim, Geun-Hee Yoo, Chaoyi Liu, Soohyun Im, Minhazul Islam, Yue Fan, Eun Soo Park, Jinwoo Hwang |
On-Site Speaker (Planned) |
Jinwoo Hwang |
Abstract Scope |
Angular correlation (AC) analysis of 4D-STEM nanodiffraction was used to determine the type and degree of medium range ordering (MRO) that constitutes the nanoscale heterogeneity in Zr-Cu and Zr-Cu-Al metallic glasses (MGs). AC reveals significant changes in MRO as the composition changes, such as from binary to ternary, as well as from eutectic to hypereutectic. The changes include the splitting of 2-fold peaks (which indicates the separation of MRO types) in more fragile glasses, and the emergence of strong 6-fold symmetries in more strong glasses. We correlate these results to the changes in fragility, ductility, and glass forming ability of these glasses. ACs from atomistic models were also simulated and compared to the experimental ACs from the same composition, which is a necessary effort to advance toward developing new atomistic models that generate fully realistic MRO structures. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Modeling and Simulation, Mechanical Properties |