Superplastic flow in a nanostructured aluminum alloy produced using high-pressure torsion

Cheng Xu, Sergey V. Dobatkin, Zenji Horita, Terence G. Langdon

    研究成果: ジャーナルへの寄稿学術誌査読

    46 被引用数 (Scopus)


    Samples of a spray-cast Al-7034 alloy were processed by high-pressure torsion (HPT) at temperatures of 293 or 473 K using an imposed pressure of 4 GPa and torsional straining through five revolutions. Processing by HPT produced significant grain refinement with grain sizes of ∼60 and ∼85 nm at the edges of the disks for the two processing temperatures. In tensile testing at room temperature, the alloy processed by HPT exhibited higher strength and lower ductility than the unprocessed material. Good superplastic properties were achieved in tensile testing at elevated temperatures with a maximum elongation of 750% for the sample processed at 473 K and tested in tension at 703 K under an initial strain rate of 1.0 × 10-2 s-1. The measured superplastic elongations are lower than in samples prepared by equal-channel angular pressing because of the use of very thin disks in the HPT processing.

    ジャーナルMaterials Science and Engineering A
    出版ステータス出版済み - 1月 25 2009

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学


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