A new beta titanium alloy system reinforced with superlattice intermetallic precipitates
Research output: Contribution to journal › Article › peer-review
Authors
Colleges, School and Institutes
Abstract
Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age-hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature β (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 °C/80 h) precipitated B2 TiFe <100 nm in size. The orientation relationship was found to be ⟨100⟩A2//⟨100⟩B2, {100}A2//{100}B2, with a misfit of −6.1%. The alloy was found to be very hard (HV0.5 = 6.4 GPa) and strong (σy, 0.2 = 1.9 GPa) with a density of 6.68 g cm−3. TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting.
Details
Original language | English |
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Pages (from-to) | 71-75 |
Number of pages | 5 |
Journal | Scripta Materialia |
Volume | 140 |
Early online date | 14 Jul 2017 |
Publication status | Published - 1 Nov 2017 |
Keywords
- Dislocations, Mechanical properties, Microstructure, Precipitation, Titanium alloys