Superplasticity in the Ti-6Al-7Nb alloy processed by high-pressure torsion

Maki Ashida, Peng Chen, Hisashi Doi, Yusuke Tsutsumi, Takao Hanawa, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    37 Citations (Scopus)


    The Ti-6Al-7Nb alloy is considered a promising material for biomedical applications as it is free of V, which is replaced with Nb for better biocompatibility. This Ti alloy was processed by high-pressure torsion (HPT) at room temperature to refine the grain size to ~100nm. The Vickers microhardness was increased from 325 HV at the initial as-annealed state to 385 HV after the HPT processing. The HPT-processed samples were deformed under tension at 1073K (~0.58Tm, Tm is the melting point) with an initial strain rate in the range of 10-4 to 10-2s-1. The HPT-processed sample through 5 revolutions exhibited an excellent superplastic elongation of 930% at an initial strain rate of 2×10-3s-1. To conclude, HPT processing is effective in achieving superplasticity of the Ti-6Al-7Nb alloy.

    Original languageEnglish
    Pages (from-to)449-453
    Number of pages5
    JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
    Publication statusPublished - Jul 9 2015

    All Science Journal Classification (ASJC) codes

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


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