九州工業大学 大学院 工学府 物質工学専攻  マテリアル工学コース / 工学部 マテリアル工学科

環境材料強度学研究室

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研究業績

2009年

  • Asahi Ota, Yushin Yazaki, Ken'ichi Yokoyama and Jun'ichi Sakai, Hydrogen absorption and thermal desorption behavior of Ni-Ti superelastic alloy immersed in neutral NaCl and NaF solutions under applied potential, Materials Transactions, 2009, vol. 50, 1843-1849.
  • Atsushi Fujita, Toshio Ogawa, Ken'ichi Yokoyama and Jun'ichi Sakai, Relationship between hydrogen absorption and corrosion behavior of Ti-6Al-4V alloy immersed in acidic fluoride solutions, Materials Transactions, 2009, vol. 50, pp. 1183-1189.
  • Ken'ichi Yokoyama, Tokunori Kanemura and Jun'ichi Sakai, Improvements in fracture properties of Ni-Ti superelastic alloy in physiological saline solution containing hydrogen peroxide by surface modification, Materials Science and Engineering A, 2009, vol. 513-514, pp. 267-275.
  • Ken'ichi Yokoyama, Miho Tomita and Jun'ichi Sakai, Hydrogen embrittlement behavior induced by dynamic martensite transformation of Ni-Ti superelastic Alloy, Acta Materialia, 2009, vol. 57, pp. 1875-1885.

2008年

  • Tokunori Kanemura, Ken'ichi Yokoyama and Jun'ichi Sakai, Effects of acid type on corrosion and fracture behaviors of Ni-Ti superelastic alloy under sustained tensile load in physiological saline solution containing hydrogen peroxide, Corrosion Science, 2008, vol. 50, pp. 2785-2795.
  • Miho Tomita, Ken'ichi Yokoyama and Jun'ichi Sakai, Effects of potential, Temperature and pH on hydrogen absorption and thermal desorption behaviors of Ni-Ti superelastic alloy in 0.9% NaCl solution, Corrosion Science, 2008, vol. 50, pp. 2061-2069.
  • Ken'ichi Yokoyama, Katsutoshi Takashima and Jun'ichi Sakai, Susceptibility to hydrogen absorption and hydrogen thermal desorption of titanium alloys immersed in neutral fluoride solution under applied potential, Materials Transactions, 2008, vol. 49, pp. 1661-1666.
  • Miho Tomita, Ken'ichi Yokoyama, Kenzo Asaoka and Jun'ichi Sakai, Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging, Materials Science and Engineering A, 2008, vol. 476, pp. 308-315.

2007年

  • Ken'ichi Yokoyama, Miho Tomita, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen absorption and thermal desorption behaviors of Ni-Ti superelastic alloy subjected to sustained tensile-straining test with hydrogen charging. Scripta Materialia, vol. 57, 2007, pp. 393-396.
  • Ken'ichi Yokoyama, Toshio Ogawa, Katsutoshi Takashima, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen embrittlement of Ni-Ti superelastic alloy aged at room temperature after hydrogen charging. Materials Science and Engineering A, vol. 466, 2007, pp. 106-113.
  • Ken'ichi Yokoyama, Toshio Ogawa, Atsushi Fujita, Kenzo Asaoka, Jun'ichi Sakai, Fracture of Ni-Ti superelastic alloy under sustained tensile load in physiological saline solution containing hydrogen peroxide. Journal of Biomedical Materials Research Part A, vol. 82A, 2007, pp. 558-567.
  • Katsutoshi Takashima, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai, Effects of potential on hydrogen absorption and desorption behaviors of titanium in neutral fluoride solutions. Journal of Alloys and Compounds, vol. 431, 2007, pp. 203-207.

2006年

  • Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen absorption of titanium and nickel-titanium alloys during long-term immersion in neutral fluoride solution. Journal of Biomedical Materials Research Part B: Applied Biomaterials, vol. 78B, 2006, pp. 204-210.
  • Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai, Effects of moisture and dissolved oxygen in methanol and ethanol solutions containing hydrochloric acid on hydrogen absorption and desorption behaviors of Ni-Ti superelastic alloy. Materials Science and Engineering A, vol. 422, 2006, pp. 218-226.
  • Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai, Fracture of sustained tensile-loaded Ti-0.2% Pd alloy in acid and neutral fluoride solutions. Materials Science and Engineering A, vol. 419, 2006, pp. 122-130.

2005年

  • Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai, Evaluation of hydrogen absorption properties of Ti-0.2mass% Pd alloy in fluoride solutions. Journal of Alloys and Compounds, vol. 400, 2005, pp. 227-233.
  • Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai, Distribution and thermal desorption behavior of hydrogen in titanium alloys immersed in acidic fluoride solutions. Journal of Alloys and Compounds, vol. 396, 2005, pp. 269-274.
  • Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai, Susceptibility to delayed fracture of alpha-beta titanium alloy in fluoride solutions. Corrosion Science, vol. 47, 2005, pp. 1778-1793.
  • Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen embrittlement of Ni-Ti superelastic alloy in ethanol solution containing hydrochloric acid. Materials Science and Engineering A, vol. 393, pp. 239-246.
  • Ken'ichi Yokoyama, Kazuyuki Kaneko, Toshio Ogawa, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions. Biomaterials, vol. 26, 2005, pp. 101-108.

2004年

  • Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen absorption of titanium in acidic fluoride solutions. Materials Science and Engineering A, vol. 384, 2004, pp. 19-25.
  • Ken'ichi Yokoyama, Tatsuya Eguchi, Kenzo Asaoka, Michihiko Nagumo, Effect of constituent phase of Ni-Ti shape memory alloy on susceptibility to hydrogen embrittlement. Materials Science and Engineering A, vol. 374, 2004, pp. 177-183.
  • Kazuyuki Kaneko, Ken'ichi Yokoyama, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai, Degradation in performance of orthodontic wires caused by hydrogen absorption during short-term immersion in 2.0% acidulated phosphate fluoride solution. The Angle Orthodontist, vol. 74, 2004, pp. 487-495.
  • Ken'ichi Yokoyama, Kazuyuki Kaneko, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai, Michihiko Nagumo, Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions. Journal of Biomedical Materials Research Part A, vol. 69 A, 2004, pp. 105-113.
  • Toshio Ogawa, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai, Hydrogen absorption behavior of beta titanium alloy in acid fluoride solutions. Biomaterials, vol. 25, 2004, pp. 2419-2425.
  • Ken'ichi Yokoyama,KazuyukiKaneko, Eiji Yabuta, Kenzo Asaoka, Jun'ichi Sakai, Fracture of nickel-titanium superelastic alloy in sodium hypochlorite solution. Materials Science and Engineering A, vol. 369, 2004, pp. 43-48.
  • Ken'ichi Yokoyama, Kazuyuki Kaneko, Youji Miyamoto, Kenzo Asaoka, Jun'ichi Sakai, Michihiko Nagumo, Fracture associated with hydrogen absorption of sustained tensile-loaded titanium in acid and neutral fluoride solutions. Journal of Biomedical Materials Research Part A, vol. 68A, 2004, pp. 150-158.

2003年

  • Ken'ichi Yokoyama, Toshio Ogawa, Kenzo Asaoka, Jun'ichi Sakai, Michihiko Nagumo, Degradation of tensile strength of Ni-Ti superelastic alloy due to hydrogen absorption in methanol solution containing hydrochloric acid, Materials Science and Engineering A, vol. 360, 2003, pp. 153-159.
  • Kazuyuki Kaneko, Ken'ichi Yokoyama, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai, Michihiko Nagumo, Delayed fracture of beta titanium orthodontic wire in fluoride aqueous solutions. Biomaterials, vol. 24, 2003, pp. 2113-2120.
  • Ken'ichi Yokoyama, Kazuyuki Kaneko, Keiji Moriyama, Kenzo Asaoka, Jun'ichi Sakai, Michihiko Nagumo, Hydrogen embrittlement of Ni-Ti superelastic alloy in fluoride solution. Journal of Biomedical Materials Research Part A, vol. 2003, pp. 182-187.
  • Ken'ichi Yokoyama, Shiyozo Watabe, Kenichi Hamada, Jun'ichi Sakai, Kenzo Asaoka, Michihiko Nagumo, Susceptibility to delayed fracture of Ni-Ti superelastic alloy. Materials Science and Engineering A, vol. 341, 2003, pp. 91-97.
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