The evolution of homogeneity and grain refinement during equal-channel angular pressing: A model for grain refinement in ECAP

Cheng Xu, Minoru Furukawa, Zenji Horita, Terence G. Langdon

    Research output: Contribution to journalArticlepeer-review

    253 Citations (Scopus)

    Abstract

    Samples of pure aluminum and an Al-6061 alloy were subjected to equal-channel angular pressing (ECAP) for up to eight passes at room temperature. The Vickers microhardness was recorded on the polished cross-sections of each as-pressed billet and the results are plotted in the form of color-coded maps to provide a pictorial depiction of the hardness distributions throughout the cross-sections. The results show the hardness increases by a factor of ∼2 in the first pass through the die but thereafter there is only a minor increase. The microhardness distribution is homogeneous in the unpressed condition but becomes inhomogeneous after a single pass and then reasonably homogeneous in subsequent passes. The results reveal some differences between the behavior of pure Al and the Al-6061 alloy. These results and microscopic observations are used to develop a model for the process of grain refinement during ECAP.

    Original languageEnglish
    Pages (from-to)66-76
    Number of pages11
    JournalMaterials Science and Engineering A
    Volume398
    Issue number1-2
    DOIs
    Publication statusPublished - May 25 2005

    All Science Journal Classification (ASJC) codes

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

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