TEM observations of twin intersections in a Ti-47Al-2Cr-2Nb-0.1Y alloy compressed at room temperature

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

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    1 Citation (Scopus)

    Abstract

    Twin intersections in TiAl alloy compressed at room temperature were investigated by high-resolution electron microscopy (HREM). One incident twin (TI) was observed to divide into three thin twin bands and leave several superlattice intrinsic stacking faults (SISFs) in the barrier twin (TB). It was a process related to the dislocation dissociation: (1/2)[1 1 2] → (1/6)[1 1 2] + SISF + (1/6)[1 1 2] + SESF + (1/6)[1 1 2]. The nucleation of type-I twin intersection was also observed. The incident twin was found to be a bundle of SISFs, instead of a perfect twin lath. In addition, a triangular striated structure around type-I twin intersection was examined by HREM. The formation mechanism of this triangular striated structure and the related dislocation reactions were discussed.

    Original languageEnglish
    Pages (from-to)201-205
    Number of pages5
    JournalJournal of Alloys and Compounds
    Volume454
    Issue number1-2
    DOIs
    Publication statusPublished - 2008 Apr 24

    Keywords

    • Atomic scale structure
    • Intermetallics
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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