Developing grain refinement and superplasticity in a magnesium alloy processed by high-pressure torsion

Masaaki Kai, Zenji Horita, Terence G. Langdon

    Research output: Contribution to journalArticlepeer-review

    174 Citations (Scopus)

    Abstract

    Experiments were conducted on a Mg-9% Al alloy to evaluate the microstructural characteristics and the tensile properties at elevated temperatures after processing by high-pressure torsion (HPT) at room temperature and at 423 K. Ultrafine grain sizes were achieved by processing samples in both an extruded and a cast condition. The results demonstrate the viability of using HPT as a processing technique for achieving significant grain refinement in magnesium alloys which are not processed easily by equal-channel angular pressing (ECAP). Superplastic ductilities were achieved in tensile testing at a temperature of 473 K with a maximum measured elongation of 810%. In general, higher superplastic elongations were achieved after processing by HPT at 423 K because of the development of some limited internal cracking when processing at room temperature.

    Original languageEnglish
    Pages (from-to)117-124
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume488
    Issue number1-2
    DOIs
    Publication statusPublished - Aug 15 2008

    All Science Journal Classification (ASJC) codes

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

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