Suppression of Grain Boundary α Formation by Addition of Silicon in a Near-β Titanium Alloy

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  • Nakai Masaaki
    Department of Mechanical Engineering, Faculty of Science and Engineering, Kindai University
  • Niinomi Mitsuo
    Department of Materials Science and Engineering, Faculty of Science and Technology, Meijo University Institute for Materials Research, Tohoku University Department of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Liu Huihong
    Joining and Welding Research Institute, Osaka University
  • Kitashima Tomonori
    Research Center for Structural Materials, National Institute for Materials Science

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Abstract

<p>The effect of Si addition on the microstructure and mechanical properties of a near-β titanium alloy Ti-17 with fully lamella microstructure was investigated. It was found that the microstructure of Ti-17 with silicon exhibited the absence of a continuously thick α layer along prior-β grain boundaries (grain boundary α), while the grain boundary α was distinctively formed in Ti-17 without Si. The formation of (Ti, Zr) silicide particles at the prior-β grain interior and its grain boundaries were observed, and the presence of these particles were related to the disappearance of grain boundary α similar to the oxygen scavenging effect of boride particles reported previously. With regard to mechanical properties, Ti-17 with silicon exhibits higher strength and lower ductility compared with Ti-17 without Si. Ductile transgranular fracture morphology was observed even on the fracture surface of Ti-17 with Si after tensile test.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (9), 1749-1754, 2019-07-01

    The Japan Institute of Metals and Materials

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