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• W2037308405 abstract "Abstract The structure of γ-α2 interfaces in binary and Ta-containing Ti-Al alloys was analysed by high-resolution transmission electron microscopy and image simulations. Growth of α2-Ti3Al plates was found to be due to a ledge mechanism, consisting of Shockley partial dislocations on alternate (111)γ planes. The interface is atomically flat between the ledges and addition of 2 at.% Ta was found to transform arrays of growth ledges in the binary alloy into islands on the plate faces in the Ta-containing alloy for identical heat treatments. The height of the ledges and islands was always a multiple of two (111)γ planes, the c parameter (0·463 nm) of the α2-phase. The islands were bounded by 90° (edge) and 30° (screw) Shockley partial dislocations. The 30° partial dislocation cores were localized, whereas the 90° partial dislocation cores appeared to be highly delocalized because of the presence of a high density of kinks, which in one case was found to be about 0·65 nm−1. The ratio of 30° partials to 90° partials accomplishing the γ↔α2 transformation was found to be 3 to 1, which differs from the ideal ratio of 2 to 1 found during f.c.c.↔h.c.p. diffusional transformations. These results are interpreted in terms of the growth mechanisms and morphology of the α2-phase. The image simulation studies show that the contrast of alternate (0002) planes in α2-Ti3Al is due to beam tilt parallel to the interface plane rather than to actual ordering within the structure. A mechanism for creation of compositional faults at a pre-existing γ-α2 interface is proposed, and this gives rise to γ-TiAl lamellae within the α2-Ti3Al structure." @default.
• W2037308405 created "2016-06-24" @default.
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• W2037308405 date "1992-11-01" @default.
• W2037308405 modified "2023-10-16" @default.
• W2037308405 title "High-resolution electron microscopy of γ-α₂interfaces in titanium aluminide" @default.
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• W2037308405 doi "https://doi.org/10.1080/01418619208201588" @default.
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