About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
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Advances in Refractory High Entropy Alloys and Ceramics
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| Presentation Title |
Tension-Compression Asymmetry in HfNbTaTiZr Refractory High-Entropy Alloys Studied with In Situ Neutron Diffraction |
| Author(s) |
Lia Amalia, Nathan Grain, Anshu Raj, Xin Wang, Kaijun Yin, John Whitlow, Xuesong Fan, Christopher Tandoc, Yanfei Gao, Ke An, Yan Chen, Dunji Yu, Shuozi Xu, Jian-Min Zuo, Yong-Jie Hu, Eric A. Lass, Peter Liaw |
| On-Site Speaker (Planned) |
Peter Liaw |
| Abstract Scope |
Refractory high-entropy alloys (RHEAs) offer excellent high-temperature strength, making them attractive for aerospace, power generation, and nuclear applications. However, they are often limited in room-temperature ductility, and some alloy systems show pronounced tension-compression asymmetry. The cause of these limitations is 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. The present work employs in situ neutron diffraction to investigate the tensile and compressive deformation mechanisms of the Hf-Nb-Ta-Ti-Zr system with varying degrees of body-centered-cubic (BCC) phase stability. By analyzing the lattice strain, peak- intensity evolution, dislocation character, and dislocation density, the goal of this study is to uncover how compositional variations and BCC phase stability influence the asymmetry and underlying deformation processes. The findings will provide new mechanistic understanding of RHEAs and inform future alloy design strategies. |