Effect of indentation size on plastic deformation processes in an ultrafine-grained Al-3% Mg alloy

Zs Kovács, N. Q. Chinh, J. Lendvai, Z. Horita, T. G. Langdon

    Research output: Contribution to journalConference articlepeer-review

    5 Citations (Scopus)


    An Al-3% Mg alloy was processed by Equal Channel Angular Pressing (ECAP) for 8 passes in route BC thereby reducing the grain size of the annealed sample from ∼400 μm to ∼300 nm. The as-pressed ultrafine-grained material was examined using depth-sensing indentation tests over different length scales with the overall objective of identifying the different deformation processes taking place in the bulk submicrometer crystalline material. At small indentation sizes with indentation depths of <1000 nm, plastic instabilities in the form of the Portevin-Le Châtelier (PLC) effect were observed in the as-pressed material. At the macroscopic scale, however, the alloy exhibited no PLC instabilities thereby suggesting that dislocation motion then makes only a limited contribution to the plastic deformation and the flow is controlled instead by another mechanism associated with the presence of a very large number of grain boundaries.

    Original languageEnglish
    Pages (from-to)1073-1078
    Number of pages6
    JournalMaterials Science Forum
    Issue number2
    Publication statusPublished - 2002
    EventAluminium Alloys 2002 Their Physical and Mechnaical Properties: Proceedings of the 8th International Conference ICAA8 - Cambridge, United Kingdom
    Duration: Jul 2 2002Jul 5 2002

    All Science Journal Classification (ASJC) codes

    • General Materials Science
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering


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