Production of Superplastic Ti–6Al–7Nb Alloy Using High-Pressure Sliding Process

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  • Watanabe Kyohei
    Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University
  • Ashida Maki
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU)
  • Masuda Takahiro
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University
  • Kral Petr
    Institute of Physics of Materials, ASCR CEITEC – IPM, Institute of Physics of Materials, ASCR
  • Takizawa Yoichi
    Technology Department, Nagano Forging Co., Ltd.
  • Yumoto Manabu
    Technology Department, Nagano Forging Co., Ltd.
  • Otagiri Yoshiharu
    Technology Department, Nagano Forging Co., Ltd.
  • Sklenicka Vaclav
    Institute of Physics of Materials, ASCR CEITEC – IPM, Institute of Physics of Materials, ASCR
  • Hanawa Takao
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU)
  • Horita Zenji
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University

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<p>A Ti–6Al–7Nb alloy was processed by severe plastic deformation through high-pressure sliding (HPS) at room temperature for grain refinement. The microstructure consists of grains with sizes of 200–300 nm in diameter having high and low angles boundaries. Superplasticity appeared with the total elongation of more than 400% and this was more likely when the tensile specimen is deformed in the direction parallel than perpendicular to the sliding direction. However, the superplastic elongation is almost the same irrespective of whether the sliding was made in the single direction or in the reversible directions as far as the total sliding distance is the same. The total elongation is invariably higher for the tensile testing at 1123 K than at the other temperatures, reaching the highest elongation of 790% at the initial strain rate of 1 × 10−3 s−1. The strain rate sensitivity and the activation energy for the deformation were determined to be more than ∼0.3 and 199 kJ/mol, respectively. The microstructural observation reveals that the α phase region covers more than 85% of the tensile specimens after deformation and their grains are equiaxed in shape. It is concluded that the superplastic deformation is mainly controlled by grain boundary sliding through thermally activation by lattice diffusion.</p><p> </p><p>This Paper was Originally Published in Japanese in J. JILM 68 (2018) 9–15.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (9), 1785-1791, 2019-07-01

    公益社団法人 日本金属学会

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