Factors influencing the flow and hardness of materials with ultrafine grain sizes

Minoru Furukawa, Zenji Horita, Minoru Nemoto, Ruslan Z. Valiev, Terence G. Langdon

    Research output: Contribution to journalArticlepeer-review

    97 Citations (Scopus)

    Abstract

    Ultrafine grain sizes were introduced into an Al-3wt%Mg solid solution alloy and a commercial Al-Mg-Li-Zr alloy through intense plastic straining by equal-channel angular (ECA) pressing at room temperature and at 673 K respectively. Tensile testing of pressed samples at room temperature revealed markedly different stress-strain curves for these two alloys, with the Al-3wt%Mg alloy exhibiting a high yield stress with little subsequent strain hardening and the Al-Mg-Li-Zr alloy exhibiting a lower yield stress and extensive strain hardening after yielding. These and other experimental results are interpreted in terms of the nature of the microstructure introduced by the ECA pressing procedure. It is concluded that significant variations may occur in the mechanical properties of nominally similar ultrafine-grained materials depending upon the pressing conditions and the extent of any relaxation which may occur during the straining process.

    Original languageEnglish
    Pages (from-to)203-215
    Number of pages13
    JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
    Volume78
    Issue number1
    DOIs
    Publication statusPublished - Jul 1 1998

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Materials Science(all)
    • Condensed Matter Physics
    • Physics and Astronomy (miscellaneous)
    • Metals and Alloys

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