About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Compositionally Tuned Cryogenic Plasticity in TiZrHf-Based HCP High-Entropy Alloys |
| Author(s) |
Haomin Lyu, Kooknoh Yoon, Xiaoyu Chen, David Jany, Peter Hosemann, Daryl C. Chrzan, Andrew M. Minor |
| On-Site Speaker (Planned) |
Haomin Lyu |
| Abstract Scope |
Hexagonal TiZrHf high-entropy alloys (HEAs) are potential candidates for excellent mechanical properties over a wide temperature range. By systematically varying elemental ratios and therefore the c/a ratio, we have investigated the effect of composition in terms of crystal structure, grain morphology and stacking-fault density. To investigate low temperature deformation behavior, we have applied cryogenic nanoindentation to determine hardness, elastic modulus and pop-in behavior, while 4D-STEM strain mapping and high-resolution TEM from FIB lift-outs are used to identify deformation features and quantify twin fraction, stacking-fault width and 〈c+a〉 dislocation networks beneath representative indents. Our goal is to correlate the mechanical metrics with defect statistics to generate a plasticity map that delineates how the c/a–microstructure regulates twinning and effects strength and ductility. This composition–microstructure–property framework will guide the rational design of resilient hexagonal HEAs for demanding cryogenic structural components in liquefied-gas transport vessels and lightweight space structures.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |