An evaluation of the flow behavior during high strain rate superplasticity in an al-mg-sc alloy

Shogo Komura, Zenji Horita, Minoru Furukawa, Minoru Nemoto, Terence G. Langdon

    Research output: Contribution to journalArticlepeer-review

    172 Citations (Scopus)

    Abstract

    An Al-3 pct Mg-0.2 pct Sc alloy was fabricated by casting and subjected to equal-channel angular pressing to reduce the grain size to ∼0.2 μm. Very high tensile elongations were achieved in this alloy at temperatures over the range from 573 to 723 K, with elongations up to >2000 pct at temperatures of 673 and 723 K and strain rates at and above 10-2 s-1. By contrast, samples of the same alloy subjected to cold rolling (CR) yielded elongations to failure of <400 pct at 673 K. An analysis of the experimental data for the equal-channel angular (ECA)-pressed samples shows consistency with conventional superplasticity including an activation energy for superplastic flow which is within the range anticipated for grain boundary diffusion in pure Al and interdiffusion in Al-Mg solid solution alloys.

    Original languageEnglish
    Pages (from-to)707-716
    Number of pages10
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume32
    Issue number13
    DOIs
    Publication statusPublished - 2001

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys

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