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Nag, S.
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article
Conjugated precipitation of twin-related α and Ti2Cu phases in a Ti-25V-3Cu alloy
Abstract
The formation of conjugated precipitates in a ternary Ti–25V–3Cu (wt.%) (Ti–24.4V–2.3Cu (at.%)) alloy subjected to isothermal aging at 500 C was investigated in this study. X-ray diffraction confirms that the equilibrium precipitates in the alloy are hexagonal α phase and bodycentered-tetragonal (bct) Ti<sub>2</sub>Cu intermetallic compound. These precipitates are composed of two geometrically symmetrical components, which are verified by transmission electron microscopy (TEM) to be twin-related variants of α and Ti<sub>2</sub>Cu phases. Atomic-level characterizations incorporating high-resolution TEM and atom probe tomography were used to investigate the early-stage nucleation process of the precipitates. The results reveal that precipitation occurs heterogeneously on plate-like (or disc-like) metastable Cu-enriched GP zones that preferentially inhabit {110}<sub>β</sub> planes. Crystallographic orientation analyses suggest that the Ti<sub>2</sub>Cu phase is related to the matrix via a definite orientation relationship of (013)<sub>Ti2Cu</sub>||(011)<sub>β</sub> and [100]<sub>Ti2Cu</sub>||[100]<sub>β</sub>, while the growth of the α phase is governed by the Potter’s OR such that (1101)<sub>α</sub>||(011)<sub>β </sub>and [1120]<sub>α</sub>||[111]<sub>β</sub>. (013)<sub>Ti2Cu</sub> and (1101)<sub>α</sub> are the twin planes of the respective phases. In spite of highly distinct crystal structures, the conjugated α and Ti<sub>2</sub>Cu phases attain a nearly perfect lattice correspondence along certain crystallographic planes, which results in a low interfacial energy configuration and favours the co-development of these phases.