About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
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| Presentation Title |
Improved Mechanical Behavior in Metastable Ti–50Nb via Oxygen-Induced Phase Evolution |
| Author(s) |
Julia T. Purstl, Ravit Silverstein, Solène Comby-Dassonneville, Bailey Rhodes, Nicolò Maria della Ventura, Christoph Gammer, Jeremiah Thomas, Thomas Cornélius, Olivier Thomas, Daniel S. Gianola |
| On-Site Speaker (Planned) |
Julia T. Purstl |
| Abstract Scope |
With recent advances in complex alloy design, there is growing interest in the role of interstitial oxygen on mechanical properties. Here, we investigate how nanoscale chemically ordered domains and local strain fields around O interstitials affect deformation in a model bcc Ti–50Nb–1 at% O alloy. Using TEM, in-situ 4D-(T/)SEM under applied strain, and micro-compression with μ-Laue synchrotron XRD, we explore thermal and stress-induced phase transformations originating from O-rich nanodomains.
We track the O-driven formation of secondary phase embryos and show their evolution to hcp α and orthorhombic O′ and α″ phases. Surprisingly, oxygen suppresses the formation of the otherwise detrimental ω-phase, favoring transformations along the bcc–hcp Burgers path. The interaction between these O-stabilized phases and dislocations enhances strength and alters deformation pathways under thermal ageing and applied stress. These results show that oxygen interstitials can guide alloy design, offering a pathway toward high-performance Ti-based alloys with more sustainable production. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Titanium, Phase Transformations |