Phase transformation in the nitride layer during the oxidation of TiAl-based alloys

W. Lu, C. L. Chen, F. H. Wang, J. P. Lin, G. L. Chen, L. L. He

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    The orientation relationship (OR) between the TiN and Ti2AlN phases in the nitride layer during the oxidation of TiAl-based alloy at 900 °C was determined by transmission electron microscopy (TEM). The OR is (1 1 1)TiN ∥ (0 0 0 1)Ti2AlN, [0 over(1, ̄) 1]TiN ∥ [1 1 over(2, ̄) 0]Ti2 AlN. Al can reduce the twin boundary energy of TiN, leading to the formation of many stacking faults in the Al-enriched TiN phase. The Ti2AlN phase forms at the bottom of the TiN phase when the Al content is sufficient to induce phase transformation. Phase transformation was identified in the Ti2AlN phase after electron irradiation for about 40 s.

    Original languageEnglish
    Pages (from-to)773-776
    Number of pages4
    JournalScripta Materialia
    Volume56
    Issue number9
    DOIs
    Publication statusPublished - 2007 May

    Keywords

    • Orientation relationship
    • Oxidation
    • TiAl
    • Transmission electron microscopy

    ASJC Scopus subject areas

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

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