Superplasticity of ultra-fine grained 7075 alloy processed by high-pressure torsion

Seungwon Lee, Zen Ji Horita

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)


    An Al 7075 alloy (5.63mass%Zn-2.56mass%Mg-1.68mass%Cu-0.21mass%Fe- 0.19mass%Cr-0.14mass%Si-0.02mass%Ti with balance of Al) was processed by high-pressure torsion (HPT) under an applied pressure of 6 GPa for 1, 3 and 5 revolutions with a rotation speed of 1 rpm at room temperature. Vickers microhardness saturated to a level of 220 Hv after the HPT processing and the grain size was refined to 120 nm at the state of the hardness saturation. Tensile tests were conducted with initial strain rates from 2.0 × 10-4 to 2.0 × 10-2 s-1 at temperatures as 200 °C and 250 °C (equivalent to 0.52Tm and 0.57Tm, respectively, where Tm is the melting point of the alloy). The HPT-processed samples for 3 revolutions exhibited superplastic elongations of 640% and 510% at 250 °C with initial strain rates of 2.0 × 10-3 s-1 and 2.0 × 10-2 s-1, respectively.

    Original languageEnglish
    Title of host publicationAluminium Alloys, ICAA 2014
    EditorsKnut Marthinsen, Bjørn Holmedal, Yanjun Li
    PublisherTrans Tech Publications Ltd
    Number of pages4
    ISBN (Print)9783038351207
    Publication statusPublished - 2014
    Event14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, Norway
    Duration: Jun 15 2014Jun 19 2014

    Publication series

    NameMaterials Science Forum
    ISSN (Print)0255-5476
    ISSN (Electronic)1662-9752


    Other14th International Conference on Aluminium Alloys, ICAA 2014

    All Science Journal Classification (ASJC) codes

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


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