| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Interstitial Engineering of BCC Refractory Multi-Principal Element Alloys and their Dislocation Pathways |
| Author(s) |
Daniel Gianola |
| On-Site Speaker (Planned) |
Daniel Gianola |
| Abstract Scope |
BCC refractory multi-principal element alloys (MPEAs) are promising candidates for structural applications demanding temperatures exceeding the capacity of state-of-the-art superalloys. While excellent high temperature strength has been demonstrated in many refractory MPEAs, a fundamental understanding of the nature of dislocation pathways and their temperature dependence in these chemically complex alloys, and the role of interstitial species such as oxygen is still in its infancy. We use in-situ deformation to elucidate the pathways for dislocation slip in several BCC MPEAs, where defect dynamics can be linked to the mechanical response. We also demonstrate a metastability approach using oxygen interstitials to drive a hierarchical microstructure in Ti-Nb alloys with tensile strength exceeding 2 GPa while retaining good damage tolerance. These properties are linked to phase decomposition pathways arising from oxygen-induced immiscibility, including spinodal decomposition with nanoscale compositional undulations and an emergent dual-phase lamellar structure co-existing with the spinodal features. |
| Proceedings Inclusion? |
Planned: |