Electron microscopy study of different stages of oxidation of Ti-47Al-2Nb-2Cr-0.15B and Ti-45Al-15Nb at 900°C

W. Lu, C. Chen, L. He, F. Wang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The initial stage of oxidation of Ti-47Al-2Nb-2Cr-0.15B and Ti-45Al-15Nb alloys was studied. Studies reveal that the X and NbCr2 phases will form in advance in the transition layer of the 2Nb2Cr alloy compared with the 15Nb alloy. The adherence between the nitride layer and underling layer is good. However, an obvious boundary exists between the mixed layer and the inner layer. The recrystallizing of the base alloy leads to an increase of the volume fraction of grain boundaries that can increase the oxidation rate at the initial oxidation stage. An Nb-based compound forms in the transition layer, which can prevent the formation of X phase.

    Original languageEnglish
    Pages (from-to)124-133
    Number of pages10
    JournalJournal of Microscopy
    Volume231
    Issue number1
    DOIs
    Publication statusPublished - 2008 Jul

    Keywords

    • Nb additional TiAl
    • Oxidation
    • Scanning transmission electron microscopy
    • X phase

    ASJC Scopus subject areas

    • Pathology and Forensic Medicine
    • Histology

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