Deformation-induced γ ↔ α2 phase transformation in TiAl alloy compressed at room temperature

Chunrin Chien, W. Lu, Y. Y. Cui, L. L. He, H. Q. Ye

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Deformation-induced γ ↔ α2 phase transformation in a Ti-47Al-2Cr-2Nb-0.2Y (at.%) alloy compressed at room temperature was investigated by high-resolution transmission electron microscopy (HREM) and energy dispersive spectrum (EDS). The deformation-induced (DI) γ → α2 phase transformation occurred in a twin intersection region. On the other hand, the deformation-induced α2 → γ transformation nucleated at the stacking faults of α2 phase. The composition analysis of the γ and α2 laths by EDS suggested that composition of some laths deviated much from their equilibrium values. These composition deviations promoted the deformation-induced γ ↔ α2 phase transformation to occur; EDS results also suggested that there was no composition difference between the DI-γ plate and the primary γ phase. Based on the HREM and EDS experimental results, the mechanism of the deformation-induced γ ↔ α2 phase transformation has been discussed.

    Original languageEnglish
    Pages (from-to)722-726
    Number of pages5
    JournalIntermetallics
    Volume15
    Issue number5-6
    DOIs
    Publication statusPublished - 2007 May 1

    Keywords

    • A. Titanium aluminides, based on TiAl
    • B. Phase transformations
    • D. Microstructure
    • F. Electron microscopy, transmission

    ASJC Scopus subject areas

    • Chemistry(all)
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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