About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Bulk Metallic Glasses XX
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Presentation Title |
The Strain Rate Sensitivity of Heterogeneous Thin Film Metallic Glasses: Interplay between Nanoscale Heterogeneity and Dynamic Plasticity |
Author(s) |
Yucong Gu, Xiao Han, Feng Yan, Lin Li |
On-Site Speaker (Planned) |
Lin Li |
Abstract Scope |
The dynamic mechanical properties of metallic glasses (MGs) are crucial to capturing the deformation signatures, as well as for structural and functional applications. In this work, we investigate the influence of nanoscale structural heterogeneity of MGs on dynamic plasticity, focusing on the variation in strain rate sensitivity and the transition of deformation mechanisms, using a combined experimental and simulation approach. The Cu50Zr50 thin-film MGs with different nanoscale heterogeneities are synthesized using magnetron sputtering, and a transition in strain rate sensitivity as the indentation rate increases is found in the MG films with a higher heterogeneity. The mesoscale shear transformation zone dynamics simulations reveal the underlying mechanisms of the transition stem from a change in deformation mechanisms. The observed strain rate sensitivity and the corresponding mechanisms are summarized in a deformation mechanism map to provide insights into the structure and property relationship of MGs on the nanoscale. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, |