About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
In-operando Observation of Twinning Mechanism in a High-entropy Alloy |
Author(s) |
Q. Yang, Y. Hu, Jian Min Zuo |
On-Site Speaker (Planned) |
Jian Min Zuo |
Abstract Scope |
How does deformation twin form is a fundamental question in crystal plasticity that has long been debated, and the question continues to attract interest in the metals community because of its prominent role in providing strength and ductility through twinning-induced plasticity. In strong and ductile high-entropy alloys (HEAs), the same role has also been suggested for nanotwins, but how twins form in HEAs is unclear. Here, we report our exploration of twinning mechanisms in Al0.1CrCoFeNi using a combination of mechanical sensing and direct TEM imaging. The experiment was performed in-situ inside a transmission electron microscope (TEM). By observing dislocation motions in compressed nanopillars oriented for twin formation, we followed the intermittent development of twins and their interaction with dislocations. The results will be interpreted based on proposed twinning mechanisms. Insights about the propensity of twin formation in HEAs will be highlighted. |
Proceedings Inclusion? |
Planned: |