Ultrafine-grained magnesium-lithium alloy processed by high-pressure torsion: Low-temperature superplasticity and potential for hydroforming

Hirotaka Matsunoshita, Kaveh Edalati, Mitsuaki Furui, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    73 Citations (Scopus)

    Abstract

    A Mg-Li alloy with 8wt% Li was processed by severe plastic deformation (SPD) through the process of high-pressure torsion (HPT) to achieve ultrafine grains with an average grain size of ~500nm. Tensile testing with an initial strain rate of 10-3s-1 showed that the alloy exhibited superplasticity at a temperature of 323K or higher. Tensile testing in boiling water confirmed that the specimens were elongated to 350-480% at 373K under the initial strain rates of 10-3s-1 to 10-2s-1 with a strain rate sensitivity of ~0.3. The current study suggests that not only superplastic forming but also superplastic hydroforming should be feasible after the grain refinement using the HPT method.

    Original languageEnglish
    Pages (from-to)443-448
    Number of pages6
    JournalMaterials Science and Engineering A
    Volume640
    DOIs
    Publication statusPublished - Jul 9 2015

    All Science Journal Classification (ASJC) codes

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

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