The oxidation behavior of Ti-46.5Al-5Nb at 900 °C

Wei Lu, Chunlin Chen, Yanjun Xi, Fuhui Wang, Lianlong He

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    The early stages of Ti-46.5Al-5Nb (at%) oxidation at 900 °C have been investigated combined with TEM and STEM. The results reveal that a layer composed of polycrystalline TiO2 and amorphous Al2O3 phase formed firstly after 5-min oxidation. The base alloy connected with the oxide scale has some deformation compared with the inner full lamellar TiAl structure. After 30-min oxidation, the phases of γ-Al2O3, κ-Al2O3, titanium nitrides and Ti5Al3O2 were formed in the area from the nitride layer to base alloy. After 50 h of oxidation, Ti5Al3O2 vanishes at the interface of oxide scale/base alloy in Ti-46.5Al-5Nb, contrary to the continuous formation of Ti5Al3O2 in γ-TiAl at the interface of oxide scale/base alloy, Al3Nb phase formed in this zone, which hinders the continuous formation of Ti5Al3O2.

    Original languageEnglish
    Pages (from-to)989-998
    Number of pages10
    JournalIntermetallics
    Volume15
    Issue number8
    DOIs
    Publication statusPublished - 2007 Aug 1

    Keywords

    • A. Titanium aluminides, based on TiAl
    • B. Oxidation
    • F. Electron microscopy, transmission

    ASJC Scopus subject areas

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

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