Enhanced work hardening by redistribution of oxygen in (α+β)-type Ti-4Cr-0.2O alloys

Duck Soo Kang, Norimitsu Koga, Masayuki Sakata, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Tensile deformation behavior of an (α+β) dual-phase Ti-4%Cr alloy containing 0.2% oxygen was compared to that of a low-oxygen Ti-4%Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4%Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4%Cr-0.2%O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4%Cr-0.2%O alloy in spite of its higher strength compared to the Ti-4%Cr alloy.

    Original languageEnglish
    Pages (from-to)101-107
    Number of pages7
    JournalMaterials Science and Engineering A
    Volume606
    DOIs
    Publication statusPublished - Jun 12 2014

    All Science Journal Classification (ASJC) codes

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

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