Deformation-induced γ → DI-α2 phase transformation occurring in the twin-intersection region of TiAl alloys

C. L. Chen, W. Lu, L. L. He, H. Q. Ye

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    4 Citations (Scopus)

    Abstract

    Deformation-induced γ → DI-α2 phase transformation was verified to occur in the twin-intersection region of a Ti-45Al-8Nb (at.%) alloy compressed at room temperature. High-resolution image observations of the deformation-induced DI-α2 phase suggested that the orientation relationship between the DI-α2 and γ phases remained the typical one: (0001) DI-α2//{111}γ, [112̄0] DI-α2//<101]γ. The conversion of stacking sequence from ordered face-centered tetragonal to ordered nonequilibrium hexagonal close-packed structure was accomplished by the movement of a/6<112̄] Shockley partial dislocations on every other {111}γ plane. Compositional analysis based on energy dispersive spectra revealed that the DI-α2 phase had the same composition as the matrix γ phase. No compositional diffusion occurred because the plastic deformation was carried out at room temperature. The strong stress concentration in the intersection region was the major force to induce the γ → DI-α2 phase transformation in the process of room-temperature compression.

    Original languageEnglish
    Pages (from-to)2416-2422
    Number of pages7
    JournalJournal of Materials Research
    Volume22
    Issue number9
    DOIs
    Publication statusPublished - 2007 Sep 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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