Superplastic behavior of large grained iron alluminides

Dongliang Lin, Aidang Shan, Dingqiang Li, Mingwei Chen, Yi Liu

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The superplastic behavior has been found in Fe3Al and FeAl alloys with large grains. The large grained Fe3Al and FeAl alloys exhibit all deformation characteristics of conventional fine grain size superplastic alloys. The values of strain rate sensitivity index (m) are all larger than 0.3 at a temperature range and a strain rate range, at which the superplastic deformation proceeds. The maximum elongation to fracture of 620% with m value of 04 for Fe-28AJ-2Ti alloy at 850 °C under an initial strain rate of 1.25 × 10-3/s and 297% with m value of 0.34 for Fe-36.5Al-2Ti alloy at 1000 °C under an initial strain rate of 2.08 × 10-2/s were obtained. The optical microscope and TEM observations have shown that during superplastic deformation grains become finer and an unstable subgrain boundary network forms, in which the subboundaries are absorbing gliding dislocations and transformed into low and high angle grain boundaries. The observed superplastic phenomenon is explained by continuous recovery and recrystallization.

    Original languageEnglish
    Pages (from-to)619-630
    Number of pages12
    JournalMaterials Science Forum
    Volume243-245
    Publication statusPublished - 1997 Jan 1

    Keywords

    • Continuous Recovery and Recrystallization
    • Intermetallics
    • Large grained Iron Aluminides
    • Superplasticity

    ASJC Scopus subject areas

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

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  • Cite this

    Lin, D., Shan, A., Li, D., Chen, M., & Liu, Y. (1997). Superplastic behavior of large grained iron alluminides. Materials Science Forum, 243-245, 619-630.