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 |
Glass Formation and Shear Banding in CrMnFeCoNi High-entropy Metallic Glasses: A Molecular Dynamics Study |
Author(s) |
Marie Joëlle Charrier, Daniel Thomas Utt, Arne Jan Klomp, Karsten Albe |
On-Site Speaker (Planned) |
Marie Joëlle Charrier |
Abstract Scope |
Metallic glasses are strong but brittle, whereas high-entropy alloys show remarkable ductility. In this work, we use atomistic computer simulations to study the combination of these two materials classes. We utilize high quench rates to kinetically suppress crystallization in the Cantor (CoCrFeMnNi) high-entropy alloy to obtain a metallic glass. Our findings reveal that the thermodynamic state of the glass depends on the chemical and structural short- / medium-range order. This is critically affected by quench rate. Slowly quenched and, thus, well-relaxed glasses exhibit a higher number of preferred structural motifs compared to a poorly-relaxed glass. In glasses with high structural ordering, the failure mechanism switches from metal-like to brittle during mechanical testing. The yield strength and stiffness increase and the glass deforms via shear localization. Compared to a Cantor nanocrystal, a well-relaxed glass shows superior strength but reduced stiffness. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Modeling and Simulation, Mechanical Properties |