| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
|
Characterization of Minerals, Metals and Materials 2025: In-Situ Characterization Techniques
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| Presentation Title |
Lattice Parameter Evolution During the β-to-α and β-to-ω Transformations of Iron and Aluminum Modified Ti-11Cr(at.%) |
| Author(s) |
Joann Ballor, Jonathan Poplawsky, Arun Devaraj, Scott Misture, Carl J. Boehlert |
| On-Site Speaker (Planned) |
Joann Ballor |
| Abstract Scope |
β-Ti alloys, Ti-11Cr, Ti-11Cr-0.85Fe, Ti-11Cr-5.3Al, and Ti-11Cr-0.85Fe-5.3Al (at.%) underwent a 400°C aging treatment for up to 12 hours to induce the β-to-ω and β-to-α phase transformations. Lattice parameters were measured in-situ using high-temperature X-ray diffraction. Phase compositions were measured ex-situ using atom probe tomography. The ω and α phases formed in Ti-11Cr. With the 0.85at.% Fe addition, the ω phase disappeared after 7.5 hours of aging. The 5.3at.% Al addition inhibited the ω-phase transformation. During aging, Cr and Fe diffused into the β phase, Ti diffused into the ω phase, and Ti and Al diffused into the α phase. The β-phase lattice parameter decreased with increased Cr and Fe contents. The relationship between the β-phase lattice parameter, the average atomic radius, the average d-shell energy, and the molybdenum equivalency is described. The c/a ratios of the α- and ω-phases were dependent on the change in the β-phase lattice parameters. |
| Proceedings Inclusion? |
Planned: |