Research field (4)：
Structural and functional materials
, Metallic materials
, Material fabrication and microstructure control
, Regenerative dentistry and dental engineering
Research keywords (2)：
摩耗
, 老朽化
Research theme for competitive and other funds (10)：
2018 - 2021 Elucidation of phenomena and mechanisms caused by the dynamic interactions between hydrogen and phase transformation
2015 - 2018 Anomalous behavior of hydrogen embrittlement and corrosion induced by hydrogen absorption during corrosion for high corrosion resistant alloys
2012 - 2015 Degradation and function induced by hydrogen absorption and states of metallic biomaterials
2009 - 2011 Fundamental study on hydrogen absorption and embrittlement of passive metal by fusion of electrochemistry and strength of materials
2008 - 2010 Characterization and elucidation of mechanism of hydrogen embrittlement accompanied with phase transformation
2006 - 2008 Characterization and elucidation of mechanisms of degradation of titanium alloys in biological environments for improvement of safety
2005 - 2007 生体環境におけるチタン合金の材質劣化に関する研究
2003 - 2005 Study of the evaluations of the severe corrosivity of body and oral cavity environments and environmental degradation and dissolution of adequately high corrosion resistant alloys
2002 - 2004 生体・口腔内環境におけるチタンの水素吸収と寿命評価
2000 - 2001 高強度・高耐食性アモルファス合金の歯科応用に関する研究
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Papers (77)：
Seo Young Rho, Jun Seob Lee, Kuga Ando, Hengjie Zhu, Seung Hoon Baek, Jae Deok Kim, Jungjae Park, Sung Kang, Ken'ichi Yokoyama. Electrochemical degradation of the hydrogen-absorption-induced passive film on an Ni-Ti superelastic alloy in an NaCl solution. Electrochimica Acta. 2024. 484. 144022
Katsutoshi Takashima, Takamasa Nishimura, Ken'ichi Yokoyama, Yoshimasa Funakawa. Delayed Fracture Enhanced by Martensite Transformed from Retained Austenite in Ultra-high Strength Steel Sheet. ISIJ International. 2024. 64. 4. 742-750
Ryosuke Hayashi, Ken'ichi Yokoyama. Changes in hydrogen states after interactions between hydrogen and stress-induced martensite transformation for Ni-Ti superelastic alloy. Philosophical Magazine Letters. 2023. 103. 1. 2266466
Ryosuke Hayashi, Ken’ichi Yokoyama. Characterization of hydrogen thermal desorption behavior and enhancement of hydrogen embrittlement in Ni-Ti superelastic alloy Induced by cathodic hydrogen charging in the presence of chloride Ions. Shape Memory and Superelasticity. 2023. 9. 3. 520-530
Ryosuke Hayashi, Ken’ichi Yokoyama. Inhibition of localized corrosion of Ni-Ti superelastic alloy in sodium hypochlorite solution by sodium carbonate addition. Shape Memory and Superelasticity. 2023
K Yokoyama, K Hamada, K Asaoka. Hydrogen embrittlement of Ni-Ti superelastic alloys. JOURNAL OF DENTAL RESEARCH. 2002. 81. A262-A262
K Yokoyama, H Ishikawa, M Nagumo. Effect of thermal cycles on toughness of heat affected zone of a Ti-killed steel. TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN. 1998. 84. 10. 740-746
K Yokoyama, H Ishikawa, M Nagumo. Role of microstructures on fracture toughness of heat affected zone of Ti-killed steel. TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN. 1997. 83. 12. 803-808
