Mechanical properties of a spray-cast aluminum alloy processed by severe plastic deformation

Cheng Xu, Megumi Kawasaki, Minoru Furukawa, Zenji Horita, Terence G. Langdon

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Experiments were conducted to evaluate the mechanical properties of a spray-cast Al-7034 alloy processed by severe plastic deformation. The alloy was received with an average grain size of ∼2.1 μm and processed by equal-channel angular pressing (ECAP) at a temperature of 473 K to give a grain size of ∼0.3 μm after 6 or 8 passes. Following ECAP, the mechanical properties were evaluated at room temperature (298 K) and at an elevated temperature of 673 K. In tensile testing at ambient temperature, the stress-strain curves show very short regions of strain hardening after ECAP and low values for the ultimate tensile strength by comparison with the unpressed alloy. This lack of strength is due to the high pressures imposed by ECAP and the consequent fragmentation and dissolution of the rod-like MgZn2 precipitates. It is shown that the strength may be restored by performing an appropriate ageing treatment after ECAP. Superplastic ductilities were recorded at a temperature of 673 K with tensile elongations exceeding 1000%. Careful inspection of the polished surfaces of samples pulled to fracture in the superplastic condition revealed the occurrence of extensive internal cavitation. Quantitative measurements showed the development of these internal cavities is consistent with conventional superplastic alloys.

    Original languageEnglish
    Title of host publicationSupplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
    Pages141-148
    Number of pages8
    EditionPART 1
    Publication statusPublished - Dec 1 2007
    Event5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
    Duration: Jul 4 2006Jul 8 2006

    Publication series

    NameMaterials Science Forum
    NumberPART 1
    Volume539-543
    ISSN (Print)0255-5476

    Other

    Other5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
    CountryCanada
    CityVancouver
    Period7/4/067/8/06

    All Science Journal Classification (ASJC) codes

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

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