The increase in a brittle-to-ductile transition temperature in Fe-Al single crystals

Masaki Tanaka, Keiki Maeno, Kenji Higashida, Masahiro Fujikura, Kohsaku Ushioda

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    The effect of aluminium concentration on a brittle-to-ductile transition (BDT) has been investigated in Fe-Al single crystals. The BDT temperatures in Fe-4mass%Al and Fe-8mass%Al crystals with <100> specimen axis were measured by an instrumental falling weight impact tester, indicating that the BDT temperature in Fe-8%Al is higher than that in Fe-4%Al. Twin-twin intersections were seen on fracture surfaces in Fe-8%Al tested at low temperatures, which shows that the intersection was the origin of a brittle fracture. In order to highlight the effect of deformation twinning on the BDT behaviour, specimens with the <110> axis were also employed to suppress the onset of deformation twinning during the impact tests. The BDT temperature in Fe-8%Al was found to be decreased by suppressing deformation twinning, which indicates that deformation twinning is a key mechanism behind increasing the BDT temperature in Fe-Al single crystals. A model to explain the increase in the BDT temperature with aluminium content is also presented.

    Original languageEnglish
    Pages (from-to)999-1004
    Number of pages6
    Journalisij international
    Volume51
    Issue number6
    DOIs
    Publication statusPublished - Jun 15 2011

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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