| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-115: Kink Band Boundary Structure and Evolution in NbTaTiHf MEA |
| Author(s) |
Xiaoyu Chen, David Cook, Madelyn Irene Payne, Andrew Minor, Robert Ritchie, Mark Asta |
| On-Site Speaker (Planned) |
Xiaoyu Chen |
| Abstract Scope |
Recently, body-centered cubic (BCC) refractory multi-principal element alloys (MEA) have demonstrated significant potential as structural materials under extreme conditions. However, their practical applications remain limited due to their low tensile ductility and damage tolerance ability. The kink band deformation mechanism has emerged as a promising approach to enhance damage tolerance by reorienting crystals into favorable slip directions. In this study, we investigate the core structure of 1/2<111> edge dislocations at the kink band boundaries in BCC MEA NbTaTiHf. Our analysis reveals that the 1/2<111> edge dislocation consists of a 1/2<100> and a 1/2<011> partial dislocation. Additionally, a series of in-situ electron backscatter diffraction (EBSD) scans of kink band propagation provide insights into the origin and directional movement of kink bands. These findings, which detail the structure and evolution of kink bands, contribute to a deeper understanding of defect mechanics and plasticity, aiding in the design of more damage-tolerant BCC MEAs. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |