About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
G-16: Phase Transition and Nanomechanical Properties of Refractory High-entropy Alloy Thin Films: Effects of Co-sputtering Mo and W to a TiZrHfNbTa System |
Author(s) |
Changjun Cheng, Michel J.R. Haché, Xiaofu Zhang, Yu Zou |
On-Site Speaker (Planned) |
Changjun Cheng |
Abstract Scope |
Composed of multiple principal refractory elements, refractory high-entropy alloys (RHEAs) have attracted significant attention due to their interesting structure and properties. However, current research on RHEAs mainly focuses on a few well-known compositions such as NbMoTaW, NbMoTaWV, and TiZrHfNbTa. Finding new RHEAs with improved mechanical properties is highly desirable. In this work, using a three-target (TiZrHf, NbTa, and Mo/W) magnetron co-sputtering system, we fabricate two new RHEA thin films – TiZrHfNbTaMo and TiZrHfNbTaW. The TiZrHfNbTaMo and TiZrHfNbTaW thin films exhibit an amorphous state, while the TiZrHfNbTa one shows a nanocrystalline structure. The nanoindentation results show that the addition of Mo or W in the TiZrHfNbTa increases the hardness while maintaining comparable elastic moduli. Based on strain rate sensitivity tests, we demonstrate their activation volumes and discuss their deformation mechanisms in the nanoindentation tests. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Thin Films and Interfaces |