Orientation faults of γ lamellae in a Ti-40 at% Al alloy

Yang, Y. S.; Wu, S.K.

doi:10.1016/0956-716x(91)90390-m

Cited by 26 publications

(1 citation statement)

References 10 publications

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“…It can be observed from figure 2.c that shear of alternate (0001)α 2 planes in the <1010>α 2 direction changes the stacking sequence of (0001)α 2 ABABAB to ABCABC stacking of (111) γ. This transformation is reported to occur by the glide of (a/6)<1010>α 2 Shockley partials shearing the (0001)α 2 planes [29,[38][39][40]. A large number of such γ nuclei are formed which eventually coalesce to form a single γ lath.…”

Section: Dissolution Of the α 2 Phasementioning

confidence: 96%

Observation of structural modulations and formation of H-carbides and ζ-silicides during α2 → γ transformation in fully lamellar γ-TiAl

Karadge

Gouma

2002

MRS Proc.

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The present paper illustrates the experimentally observed microstructures related to α 2 γ + Ti 2 AlC (Hcarbide) and Ti 5 Si 3 (ζ silicide) phase transformations in fully lamellar Ti-46Al-2Cr-3Nb-0.2W-0.2Si-0.1C alloy. These transformations were observed by in-situ heat treatments in the TEM at temperatures up to 800°C and by post heat treatment examination in a high-resolution transmission electron microscope. α 2 dissolution was observed to start both inside the lath and at the α 2 /γ interface. H-type carbides were observed to nucleate inside the α 2 lath, which explains the appearance of long arrays of well-aligned structures along prior α 2 laths in creep-deformed samples. ζ silicide precipitates nucleate at the α 2 /γ interface, this growth occurs epitaxially along the pre-existing <0001>α 2 direction. Modulated structures were observed during the α 2 H, newly formed γ and at the α 2 / ζ interface. All these modulated structures consist of regular arrangement of stacking faults and dislocations.

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Section: Dissolution Of the α 2 Phasementioning

confidence: 96%