Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion

Ali Alhamidi, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    54 Citations (Scopus)

    Abstract

    An Al-2024 alloy was processed by high-pressure torsion (HPT) to produce an ultrafine-grained structure with a grain size of ~240 nm. A maximum elongation of ~750% was attained with an initial strain rate of 1 × 10-2s-1 at 673 K, demonstrating the advent of high strain rate superplasticity through grain refinement by the HPT processing. Evaluation of the strain-rate sensitivity and the activation energy for the deformation confirmed that grain boundary sliding through grain boundary diffusion is the rate-controlling process for the superplastic deformation of the HPT-processed Al-2024 alloy.

    Original languageEnglish
    Pages (from-to)139-145
    Number of pages7
    JournalMaterials Science and Engineering A
    Volume622
    DOIs
    Publication statusPublished - Jan 2 2015

    All Science Journal Classification (ASJC) codes

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

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