<i>In Situ</i> Synchrotron X-ray Analysis: Application of High-Pressure Sliding Process to Ti Allotropic Transformation

  • Horita Zenji
    Graduate School of Engineering, Kyushu Institute of Technology Magnesium Research Center, Kumamoto University Synchrotron Light Application Center, Saga University Department of Materials Science and Engineering, Kyushu University
  • Maruno Daisuke
    Department of Materials Science and Engineering, Kyushu University
  • Ikeda Yukimasa
    Department of Materials Science and Engineering, Kyushu University
  • Masuda Takahiro
    Department of Materials Science and Engineering, Kyushu University Department of Mechanical Engineering and Materials Science, Yokohama National University
  • Tang Yongpeng
    Graduate School of Engineering, Kyushu Institute of Technology Department of Materials Science and Engineering, Kyushu University
  • Arita Makoto
    Department of Materials Science and Engineering, Kyushu University
  • Higo Yuji
    Japan Synchrotron Radiation Research Institute
  • Tange Yoshinori
    Japan Synchrotron Radiation Research Institute
  • Ohishi Yasuo
    Japan Synchrotron Radiation Research Institute

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Other Title
  • 高圧スライド法を用いたTi同素変態のその場放射光X線解析
  • コウアツ スライドホウ オ モチイタ Ti ドウ ソ ヘンタイ ノ ソノ バ ホウシャコウ Xセン カイセキ

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Abstract

<p>In this study, severe plastic deformation through high-pressure sliding (HPS) was applied for in situ high-energy X-ray diffraction analysis at SPring-8 in JASRI (Japan Synchrotron Radiation Research Institute). Allotropic transformation of pure Ti was examined in terms of temperatures, pressures and imposed strain using a miniaturized HPS facility. The true pressure applied on the sample was estimated from the peak shift. Peak broadening due to local variation of pressure was reduced using white X-ray. The phase transformation from α phase to ω phase occurred at a pressure of ∼4.5 GPa. Straining by the HPS processing was effective to promote the transformation to the ω phase and to maintain the ω phase even at ambient pressure. The reverse transformation from ω phase to α phase occurred at a temperature of ∼110℃ under ambient pressure, while under higher pressure as ∼4 GPa, the ω phase remained stable even at ∼170℃ covered in this study. It was suggested that the reverse transformation from the ω phase to the α phase is controlled by thermal energy.</p><p> </p><p>Mater. Trans. 62 (2021) 167-176に掲載</p>

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