About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Tension-compression asymmetry in HfNbTaTiZr RHEAs studied with in situ neutron diffraction |
| Author(s) |
Lia Amalia, john whitlow, xuesong fan, nathan grain, kaijun yin, eric a. lass, yanfei gao, jian-min zuo, ke an, yan chen, dunji yu, peter liaw, anshu raj, shuozhi xu, christopher tandoc, yong-jie hu |
| On-Site Speaker (Planned) |
Lia Amalia |
| Abstract Scope |
Refractory high-entropy alloys (RHEAs), composed of elements such as Hf, Nb, Ta, Ti, and Zr, offer excellent high-temperature strength, making them attractive for aerospace, power generation, and nuclear applications. However, they have limited room-temperature ductility and pronounced tension-compression asymmetry, rooted in the temperature- and orientation-dependent motion of ½〈111〉 screw dislocations in BCC structures. While prior studies have demonstrated promising strength-ductility combinations, real-time insights into deformation behavior remain limited. This work employs in situ neutron diffraction to investigate the tensile and compressive deformation mechanisms of seven compositions based on the HfNbTaTiZr system. By analyzing lattice strain, peak intensity evolution, dislocation character, and dislocation density, this study aims to uncover how compositional variations influence the asymmetry and underlying deformation processes. The findings will provide new mechanistic understanding of RHEAs and inform future alloy design strategies. |
| Proceedings Inclusion? |
Planned: |