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Abstract
The isothermal phase of Ti-5Al-5Mo-5V-3Cr wt.% is formed within a
heat treatment at
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
. The
/
interface becomes enriched with oxygen. This may be of significance as oxygen strongly stabilizes the
phase, and the
/
interface has previously been suggested as the nucleation site for subsequent
formation.
Notes
No potential conflict of interest was reported by the authors.
Additional information
Funding
JC acknowledges support from the European Union Seventh Framework Programme under the Marie Curie [grant agreement number 628643]. Atom probe tomography measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) and the LEAP tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532) and ONR DURIP (N00014-0400798, N00014- 0610539, N00014-0910781) programs. NUCAPT is a Shared Facility of the Materials Research Center of the Northwestern University, supported by the National Science Foundations MRSEC program (DMR-1121262). We are also grateful to the Initiative for Sustainability and Energy at Northwestern (ISEN) for grants to upgrade NUCAPTs capabilities.