Superplasticity in large-grained Fe3Al alloys

D. Lin, T. L. Lin, A. Shan, M. Chen

    Research output: Contribution to journalArticlepeer-review

    66 Citations (Scopus)

    Abstract

    The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti and Fe-28Al-4Ti (all compositions reported in this paper are in atomic percent) alloys has been investigated by tensile testing, optical microscopy and transmission electron microscopy. Tensile tests were performed at 700-900°C under a strain rate range of about 10-5-102/s.The maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263 kJ/mol for Fe-28Al and 191 KJ/mol for Fe-28Al-2Ti, which is much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation, the grain size became much finer; from about 100 μm to 20-30 μm. As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process.

    Original languageEnglish
    Pages (from-to)489-496
    Number of pages8
    JournalIntermetallics
    Volume4
    Issue number6
    DOIs
    Publication statusPublished - 1996 Sep

    Keywords

    • A. iron aluminides based on FeAl
    • B. superplastic behaviour
    • C. recovery
    • D. large grains
    • Recrystallization

    ASJC Scopus subject areas

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

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