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- Title
Characterization of the Interfacial Structure of Coarse α Precipitates in a Metastable β-Ti Alloy Ti-5Al-5Mo-5V-3Cr.
- Authors
Zheng, Yufeng; Clark, William A. T.; Fraser, Hamish L.
- Abstract
Lattice invariant dislocations (LIDs) on the habit plane of coarse α precipitates in a metastable β titanium alloy, Ti-5Al-5Mo-5V-3Cr (Ti-5553), were characterized directly using high-resolution, high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and analyzed in terms of a topological model. Coarse α precipitates, with an areal density of ~ 0.5 laths/μm2, were formed in a sample of Ti-5553, solution heat-treated and quenched to room temperature followed by 30 min isothermal ageing at 700°C. The Burgers vector of the LIDs on the broad face of the coarse α precipitates was determined using HAADF-STEM to be 1 2 < 111 > β , with a spacing of approximately 11 nm. Such Burgers vectors are the same as those belonging to the LIDs on the broad face of refined α precipitates in the same alloy, indicating that both types of α microstructures share a common interfacial structure with the β matrix despite different morphologies and size scales.
- Subjects
SCANNING transmission electron microscopy; TITANIUM alloys; ALLOYS
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2019, Vol 71, Issue 7, p2291
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-019-03441-8