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

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

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    45 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)170-175
    Number of pages6
    JournalMaterials Science and Engineering A
    Volume500
    Issue number1-2
    DOIs
    Publication statusPublished - Jan 25 2009

    All Science Journal Classification (ASJC) codes

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

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