High-strain rate superplasticity of Inconel 718 through grain refinement by high-pressure torsion

Yoichi Takizawa, Kenshi Otsuka, Takahiro Masuda, Takahiro Kajita, Manabu Yumoto, Yoshiharu Otagiri, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    A Ni-based superalloy (Inconel 718) was successfully processed by high-pressure torsion (HPT) under a pressure up to 6GPa at room temperature. The grain size after the HPT processing was reduced to ~100nm. Tensile testing at 1073K led to the advent of superplasticity with a maximum elongation of 1190% at a strain rate of 2×10-2s-1 which is well in the range of high-strain-rate superplasticity. This superplastic flow was accompanied by a significant decrease in the flow stress.

    Original languageEnglish
    Pages (from-to)178-182
    Number of pages5
    JournalMaterials Science and Engineering A
    Volume648
    DOIs
    Publication statusPublished - Nov 11 2015

    All Science Journal Classification (ASJC) codes

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

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