About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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Presentation Title |
High Strength Nanocrystalline CoAl Intermetallics with Room Temperature Deformability |
Author(s) |
Xinghang Zhang, Ruizhe Su , Dajla Neffati , Yashashree Kulkarni |
On-Site Speaker (Planned) |
Xinghang Zhang |
Abstract Scope |
Intermetallics have high strength, but are often brittle at room temperature. Here we present a deformable nanocrystalline CoAl intermetallics. In situ micropillar compression studies show that nanocrystalline CoAl exhibits ultra-high yield strength, exceeding 4.5 GPa, much higher than that of traditional coarse grained and nanocrystalline B2 intermetallics. Surprisingly, nanocrystalline CoAl intermetallics also shows prominent work hardening to a flow stress of 5.7 GPa up to 20% compressive strain. Transmission electron microscopy studies show that deformation induces abundant dislocations inside CoAl grains, which accommodate plastic deformation. Molecular dynamics simulations reveal unique deformation mechanisms of the nanocrystalline intermetallics. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, |