Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 96, Issue 11, Pages 416-424Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2016.1242877
Keywords
Atom probe tomography; precipitation; titanium alloys; ageing; nucleation of phase transformations
Categories
Funding
- European Union [628643]
- NSF-MRI program [DMR 0420532]
- ONR DURIP program [N00014-0400798, N00014- 0610539, N00014-0910781]
- National Science Foundations MRSEC program [DMR-1121262]
- Initiative for Sustainability and Energy at Northwestern (ISEN)
- EPSRC [EP/H004882/1, EP/L025213/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L025213/1, EP/H004882/1] Funding Source: researchfish
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The isothermal omega phase of Ti-5Al-5Mo-5V-3Cr wt.% is formed within a 2h heat treatment at 300 degrees C and identified by atom probe tomography as Ti-rich/solute lean precipitates. The composition and size remain essentially constant during ageing, although the volume fraction increases to 9.5% after ageing for 8 h. This is consistent with an ongoing transformation process of athermal. to isothermal omega. The omega/beta interface becomes enriched with oxygen. This may be of significance as oxygen strongly stabilizes the a phase, and the omega/beta interface has previously been suggested as the nucleation site for subsequent a formation.
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