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 $$ \frac{1}{2}{ }_{\beta} $$ , 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.
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