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 (75)：
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
Katsutoshi Takashima, Ruoyu Han, Ken’ichi Yokoyama, Yoshimasa Funakawa. Continuousness of interactions between hydrogen and plastic deformation of ultra-high strength steel sheet consisting of ferrite and nanometer-sized precipitates. Philosophical Magazine Letters. 2022. 102. 10. 324-334
Kaito Nakabachi, Ken’ichi Yokoyama. Inhibition of hydrogen absorption due to wear between Ni-Ti superelastic alloys in NaCl solution by H2O2 addition. Materials Letters. 2022. 324. 132701
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
