Abstract
Abstract The alloy Ti-46.5 at. % Al-2 at. % Cr-3 at. % Nb-0.2 at. % W with a fully lamellar microstructure was subjected to creep deformation at 1073K and 270 MPa. After creep deformation, fine lamellae consisting of γ and α2 laths and β precipitates were observed, which do not exist in the undeformed material, and these observations are explained by α2 → β and α2 → β-phase transformations. To understand the mechanisms of phase transformations, an overall investigation has been made by combining transmission electron microscopy, high-resolution electron microscopy, energy-dispersive spectroscopy and the fast Fourier transform technique. It was found that the two kinds of phase transformation have a close relationship but proceed by different mechanisms. The α2 → γ-phase transformation is a kind of stress-induced phase transformation, while the α2 β/-phase transformation is due to the segregation of the elements Cr and W.
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