An evaluation of superplasticity in aluminum-scandium alloys processed by equal-channel angular pressing

Patrick B. Berbon, Shogo Komura, Atsushi Utsunomiya, Zenji Horita, Minoru Furukawa, Minoru Nemoto, Terence G. Langdon

    研究成果: Contribution to journalReview article査読

    82 被引用数 (Scopus)

    抄録

    An Al-0.2%Sc alloy and an Al-3%Mg-0.2%Sc alloy were subjected to equal-channel angular pressing to a strain of ∼8 to produce grain sizes of ∼0.7 and ∼0.2 μm, respectively. Because of the presence of some areas of subgrain boundaries in the Al-3%Mg-0.2%Sc alloy, additional samples of this alloy were subjected to ECA pressing to a strain of ∼12. In both alloys, the grain sizes were reasonably stable up to annealing temperatures above 700 K. Tensile specimens were machined from the as-pressed samples for testing at elevated temperatures. The Al-3%Mg-0.2%Sc alloy pressed to a strain of ∼12 exhibited exceptional ductility with elongations up to a maximum of ∼1560% at 673 K at the high strain rate of 3.3 × 10-2 s-1. By contrast, the Al-0.2%Sc alloy failed under all conditions at elongations <400%. The difference in behavior between these two alloys is attributed to the nature of the deformation mechanism which serves to accommodate the superplastic process.

    本文言語英語
    ページ(範囲)772-778
    ページ数7
    ジャーナルMaterials Transactions, JIM
    40
    8
    DOI
    出版ステータス出版済み - 8 1999

    All Science Journal Classification (ASJC) codes

    • 工学(全般)

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