Updated on 2023/12/26

 
YOKOYAMA Ken'ichi
 
Scopus Paper Info  
Total Paper Count: 0  Total Citation Count: 0  h-index: 9

Citation count denotes the number of citations in papers published for a particular year.

Affiliation
Faculty of Engineering Department of Materials Science
Job
Associate Professor
E-mail
メールアドレス
External link

Research Interests

  • Hydrogen embrittlement

  • Corrosion

  • Ti and its alloys

  • 形状記憶合金

  • 金属間化合物

  • Metal

  • Fracture

Undergraduate Education

  • 1994.03   Waseda University   Faculty of Science and Engineering   Graduated   Japan

Post Graduate Education

  • 1999.03   Waseda University   Graduate School, Division of Science and Engineering   Doctoral Program   Completed   Japan

Degree

  • Waseda University  -  Doctor of Engineering   1999.03

Biography in Kyutech

  • 2008.04
     

    Kyushu Institute of Technology   Faculty of Engineering   Department of Materials Science   Associate Professor  

Biography before Kyutech

  • 2007.04 - 2007.07   徳島大学大学院ヘルスバイオサイエンス研究部   助教   Japan

  • 2004.04 - 2007.03   徳島大学大学院ヘルスバイオサイエンス研究部   助手   Japan

  • 1999.06 - 2004.03   徳島大学歯学部   助手   Japan

  • 1998.04 - 1999.05   早稲田大学材料技術研究所   助手   Japan

Papers

  • Changes in hydrogen states after interactions between hydrogen and stress-induced martensite transformation for Ni–Ti superelastic alloy Reviewed International journal

    Ryosuke Hayashi, Ken'ichi Yokoyama

    Philosophical Magazine Letters   103 ( 1 )   2266466   2023.10

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1080/09500839.2023.2266466

    DOI: 10.1080/09500839.2023.2266466

  • 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 Reviewed International journal

    Ryosuke Hayashi, Ken’ichi Yokoyama

    Shape Memory and Superelasticity   9 ( 3 )   520 - 530   2023.09

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1007/s40830-023-00441-1

  • Inhibition of localized corrosion of Ni–Ti superelastic alloy in sodium hypochlorite solution by sodium carbonate addition Reviewed International journal

    Ryosuke Hayashi, Ken’ichi Yokoyama

    Shape Memory and Superelasticity   2023.06

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1007/s40830-023-00452-y

  • Inhibition of hydrogen absorption due to wear between Ni–Ti superelastic alloys in NaCl solution by H2O2 addition Reviewed International journal

    Kaito Nakabachi, Ken’ichi Yokoyama

    Materials Letters   324   132701   2022.10

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

  • Continuousness of interactions between hydrogen and plastic deformation of ultra-high strength steel sheet consisting of ferrite and nanometersized precipitates Reviewed International journal

    Katsutoshi Takashima, Ruoyu Han, Ken'ichi Yokoyama, Yoshimasa Funakawa

    Philosophical Magazine Letters   102 ( 10 )   324 - 334   2022.10

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    Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1080/09500839.2022.2126535

    DOI: 10.1080/09500839.2022.2126535

  • Hydrogen absorption due to wear between Ni-Ti superelastic alloys in water Reviewed International journal

    Kaito Nakabachi, Ken’ichi Yokoyama

    Materials Letters   318   132205   2022.07

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

  • Positron annihilation lifetime spectroscopy investigation of thermal aging effect for the mechanical properties of hydrogen-absorbed tantalum Reviewed International journal

    Yasuhiro Ishijima, Ken’ichi Yokoyama, Fumiyoshi Ueno, Hitoshi Abe

    Material Transactions   63 ( 4 )   592 - 599   2022.04

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  • Degradation caused by self-multiplication of damage induced by an interplay between hydrogen and the martensite transformation in a Ni-Ti superelastic alloy Reviewed International journal

    Naoya Yamaguchi, Ken'ichi Yokoyama

    Philosophical Magazine Letters   102 ( 2 )   60 - 70   2022.02

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1080/09500839.2021.2015080

  • Countermeasure for corrosion and hydrogen embrittlement of Ni-Ti superelastic alloy in acidic fluoride solution by adding sodium bicarbonate and hydrogen peroxide Reviewed International journal

    Naoya Yamaguchi, Ken'ichi Yokoyama

    Corrosion Engineering, Science and Technology   56 ( 5 )   419 - 426   2021.03

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1080/1478422X.2021.1886740

  • Compositional dependence of the apatite formation ability of Ti–Zr alloys designed for hard tissue reconstruction Reviewed International journal

    Toshiki Miyazaki, Tomoya Hosokawa, Ken'ichi Yokoyama, Takanobu Shiraishi

    Journal of Materials Science: Materials in Medicine   31   1 - 8   2020.11

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  • Marked degradation of tensile properties induced by plastic deformation after interactions between strain-induced martensite transformation and hydrogen for type 316L stainless steel Reviewed International journal

    Keisuke Nicho, Ken'ichi Yokoyama

    Metals   10   928   2020.07

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.3390/met10070928

  • 口腔内のフッ化物による歯列矯正用Ni-Ti超弾性合金の材質劣化とその対策 Invited Reviewed

    横山賢一

    日本歯科理工学会誌   39 ( 2 )   168 - 174   2020.05

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)

  • Hydrogen embrittlement induced by hydrogen charging during deformation of ultra-high strength steel sheet consisting of ferrite and nanometer-sized precipitates Reviewed International journal

    Katsutoshi Takashima, Ruoyu Han, Ken'ichi Yokoyama, Yoshimasa Funakawa

    ISIJ International   2327 - 2333   2019.12

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  • Role of interface between ferrite and martensite in hydrogen embrittlement behavior of ultra-high strength dual-phase steel sheets Reviewed International journal

    Katsutoshi Takashima, Takamasa Nishimura, Ken'ichi Yokoyama, Yoshimasa Funakawa

    ISIJ International   59 ( 9 )   1676 - 1682   2019.09

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  • Improved fracture properties of Ni-Ti superelastic alloy under sustained tensile load in physiological saline solution containing hydrogen peroxide by hydrogen charging Reviewed International journal

    Takehiro, Shimada, Ken'ichi Yokoyama, Jun'ichi Sakai

    752   1 - 7   2018.07

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

  • Hydrogen embrittlement behavior of ultra-high strength dual phase steel sheet under sustained tensile-loading test Reviewed International journal

    Katsutoshi Takashima, Yuma Yoshioka, Ken'ichi Yokoyama, Yoshimasa Funakawa

    ISIJ International   58 ( 1 )   173 - 178   2018.01

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    Language:English   Publishing type:Research paper (scientific journal)

  • Effect of metallographic structure and machining process on the apatite-forming ability of sodium hydroxide- and heat-treated titanium Reviewed

    29   109 - 118   2018.01

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  • First interactions between hydrogen and stress-induced reverce transformation of Ni-Ti superelastic alloy Reviewed International journal

    Ken'ichi Yokoyama, Tatsuki Hashimoto, Jun'ichi Sakai

    97 ( 11 )   459 - 468   2017.11

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  • After-effects induced by interactions between hydrogen and the martensite transformation in Ni-Ti superelastic alloy Reviewed International journal

    Ken'ichi Yokoyama, Yuki Hirata, Jun'ichi Sakai

    97   350 - 358   2017.09

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  • Strong interactions between hydrogen in solid solution and stress-induced martensite transformation of Ni-Ti superelastic alloy Reviewed International journal

    Ken'ichi Yokoyama, Yuki Hirata, Toshiaki Inaba, Kenichiro Mutoh, Jun'ichi Sakai

    97   11 - 18   2017.01

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  • Effects of Temperature, Phase, Elastic Deformation and Transformation on Inhibition of Localized Corrosion of Hydrogen-Charged Ni-Ti Superelastic Alloy in NaCl Solution Reviewed

    Shigekazu Nishimoto, Ken'ichi Yokoyama, Toshiaki Inaba, Kenichiro Mutoh, Jun'ichi Sakai

    Journal of Alloys and Compounds   682   22 - 28   2016.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1016/j.jallcom.2016.04.264

    Scopus

  • Inhibition of Localized Corrosion of Ni-Ti Superelastic Alloy in NaCl Solution by Hydrogen Charging Reviewed

    Ken'ichi Yokoyama, Yuki Hirata, Toshiaki Inaba, Kenichiro Mutoh, Jun'ichi Sakai

    Journal of Alloys and Compounds   639   365 - 372   2015.08

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1016/j.jallcom.2015.03.069

    Scopus

  • Role of Dynamic Interactions between Hydrogen and Strain-induced Martensite Transformation in Hydrogen Embrittlement of Type 304 Stainless Steel Reviewed

    Yuma Yoshioka, Ken'ichi Yokoyama, Jun'ichi Sakai

    ISIJ International   55   1772 - 1780   2015.08

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.2355/isijinternational.ISIJINT-2015-132

    Scopus

    CiNii Article

  • Hydrogen Absorption into Austenitic Stainless Steels Under High-Pressure Gaseous Hydrogen and Cathodic Charge in Aqueous Solution Reviewed

    Masato Enomoto, Lin Cheng, Hiroyuki Mizuno, Yoshinori Watanabe, Tomohiko Omura, Jun'ichi Sakai, Ken'ichi Yokoyama, Hiroshi Suzuki, Ryuji Okuma

    Metallurgical and Materials Transactions E   1E   331 - 340   2014.12

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  • Creep Corrosion Cracking of Sn-3.0Ag and Sn-0.5Cu Solder Alloys in NaCl Solution Reviewed

    Ken'ichi Yokoyama, Akihide Nogami, Jun'ichi Sakai

    Corrosion Science   86   142 - 148   2014.09

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1016/j.corsci.2014.05.004

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  • Corrosion and Hydrogen Absorption of Commercially Pure Zirconium in Acid Fluoride Solutions Reviewed

    Ken'ichi Yokoyama, Daisuke Yamada, Jun'ichi Sakai

    Corrosion Science   73   375 - 381   2013.08

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1016/j.corsci.2013.04.027

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  • Hydrogen Absorption Behavior of Titanium Alloys by Cathodic Polarization Reviewed

    Yasuhiro Ishijima, Takafumi Motooka, Fumiyoshi Ueno, Masahiro Yamamoto, Gunzo Uchiyama, Jun'ichi Sakai, Ken'ichi Yokoyama, Eiji Tada, Tooru Tsuru, Yasuo Nojima, Sachio Fujine

    Proceedings of the 2013 21st International Conference on Nuclear Engineering   1 - 5   ICONE21-16079   2013.07

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    Language:English   Publishing type:Research paper (international conference proceedings)

    2013.07.29  -  2013.08.02

    DOI: 10.1115/ICONE21-16079

    Scopus

  • Fracture and Corrosion Behaviors of Ni-Ti Superelastic Alloy under Sustained Tensile Loading in Neutral Fluoride Solution Containing Hydrogen Peroxide Reviewed

    Atsushi Yoshida, Ken'ichi Yokoyama, Toshiaki Inaba, Kenichiro Mutoh, Jun'ichi Sakai

    Journal of Alloys and Compounds   544   24 - 29   2012.12

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1016/j.jallcom.2012.07.153

    Scopus

  • Effects of the Hydrogen Absorption Conditions on the Hydrogen Embrittlement Behavior of Ni-Ti Superelastic Alloy Reviewed

    Ken'ichi Yokoyama, Akira Nagaoka, Jun'ichi Sakai

    ISIJ International   52   255 - 262   2012.02

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.2355/isijinternational.52.255

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    CiNii Article

  • Fracture of Sustained Tensile-Loaded Sn-3.0Ag-0.5Cu Solder Alloy in NaCl Solution Reviewed

    Ken'ichi Yokoyama, Daisuke Tsuji, Jun'ichi Sakai

    Corrosion Science   53   3331 - 3336   2011.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1016/j.corsci.2011.06.010

    Scopus

  • Inhibition of Hydrogen Embrittlement of Ni-Ti Superelastic Alloy in Acid Fluoride Solution by Hydrogen Peroxide Addition Reviewed

    Ken'ichi Yokoyama, Yushin Yazaki, Jun'ichi Sakai

    Journal of Biomedical Materials Research Part A   98A   404 - 411   2011.09

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)

    DOI: 10.1002/jbm.a.33124

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  • Evaluation of Hydrogen Absorption Behaviour During Acid Etching for Surface Modification of Commercial Pure Ti, Ti-6Al-4V and Ni-Ti Superelastic Alloys Reviewed

    Akira Nagaoka, Ken'ichi Yokoyama, Jun'ichi Sakai

    Corrosion Science   52   1130 - 1138   2010.04

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    DOI: 10.1016/j.corsci.2009.12.029

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  • Improvements in Fracture Properties of Ni-Ti Superelastic Alloy in Physiological Saline Solution Containing Hydrogen Peroxide by Surface Modification Reviewed

    Ken'ichi Yokoyama, Tokunori Kanemura, Jun'ichi Sakai

    Materials Science and Engineering A   513-514   267 - 275   2009.07

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  • Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential Reviewed

    Asahi Ota, Yushin Yazaki, Ken'ichi Yokoyama, Jun'ichi Sakai

    Materials Transactions   50   1843 - 1849   2009.07

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  • Relationship Between Hydrogen Absorption and Corrosion Behavior of Ti-6Al-4V Alloy Immersed in Acidic Fluoride Solutions Reviewed

    Atsushi Fujita, Toshio Ogawa, Ken'ichi Yokoyama, Jun'ichi Sakai

    Materials Transactions   50   1183 - 1189   2009.05

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  • Hydrogen Embrittlement Behavior Induced by Dynamic Martensite Transformation of Ni-Ti Superelastic Alloy Reviewed

    Ken'ichi Yokoyama, Miho Tomita, Jun'ichi Sakai

    Acta Materialia   57   1875 - 1885   2009.04

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  • 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 Reviewed

    Tokunori Kanemura, Ken'ichi Yokoyama, Jun'ichi Sakai

    Corrosion Science   50   2785 - 2795   2008.10

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  • Susceptibility to Hydrogen Absorption and Hydrogen Thermal Desorption of Titanium Alloys Immersed in Neutral Fluoride Solution under Applied Potential Reviewed

    Ken'ichi Yokoyama, Katsutoshi Takashima, Jun'ichi Sakai

    Materials Transactions   49   1661 - 1666   2008.07

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  • Effects of Potential, Temperature and pH on Hydrogen Absorption and Thermal Desorption Behaviors of Ni-Ti Superelastic Alloy in 0.9% NaCl Solution Reviewed

    Miho Tomita, Ken'ichi Yokoyama, Jun'ichi Sakai

    Corrosion Science   50   2061 - 2069   2008.07

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  • Hydrogen Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Subjected to Tensile Deformation after Hydrogen Charging Reviewed

    Miho Tomita, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai

    Materials Science and Engineering A   476   308 - 315   2008.03

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  • Hydrogen Embrittlement of Ni-Ti Superelastic Alloy Aged at Room Temperature after Hydrogen Charging Reviewed

    Ken'ichi Yokoyama, Toshio Ogawa, Katsutoshi Takashima, Kenzo Asaoka, Jun'ichi Sakai

    Materials Science and Engineering A   466   106 - 113   2007.09

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  • Fracture of Ni-Ti Superelastic Alloy under Sustained Tensile Load in Physiological Saline Solution Containing Hydrogen Peroxide Reviewed

    Ken'ichi Yokoyama, Toshio Ogawa, Atsushi Fujita, Kenzo Asaoka, Jun'ichi Sakai

    Journal of Biomedical Materials Research Part A   82A   558 - 567   2007.09

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  • Hydrogen Absorption and Thermal Desorption Behaviors of Ni-Ti Superelastic Alloy Subjected to Sustained Tensile-Straining Test with Hydrogen Charging Reviewed

    Ken'ichi Yokoyama, Miho Tomita, Kenzo Asaoka, Jun'ichi Sakai

    Scripta Materialia   57   393 - 396   2007.09

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  • Effects of Potential on Hydrogen Absorption and Desorption Behaviors of Titanium in Neutral Fluoride Solutions Reviewed

    Katsutoshi Takashima, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai

    Journal of Alloys and Compounds   431   203 - 207   2007.04

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  • Fracture of Sustained Tensile-Loaded Ti-0.2% Pd Alloy in Acid and Neutral Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Toshio Ogawa,Kenzo Asaoka,Jun'ichi Sakai

    Materials Science and Engineering A   419   122 - 130   2006.04

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  • 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 Reviewed

    Toshio Ogawa,Ken'ichi Yokoyama,Kenzo Asaoka,Jun'ichi Sakai

    Materials Science and Engineering A   422   218 - 226   2006.04

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  • Hydrogen Absorption of Titanium and Nickel-Titanium Alloys During Long-Term Immersion in Neutral Fluoride Solution Reviewed

    Ken'ichi Yokoyama,Toshio Ogawa,Kenzo Asaoka,Jun'ichi Sakai

    Journal of Biomedical Materials Research Part B: Applied Biomaterials   78B   204 - 210   2006.04

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  • Hydrogen Embrittlement of Work-Hardened Ni-Ti Alloy in Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Kazuyuki Kaneko,Toshio Ogawa,Keiji Moriyama,Kenzo Asaoka,Jun'ichi Sakai

    Biomaterials   26   101 - 108   2005.04

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  • Susceptibility to Delayed Fracture of Alpha-Beta Titanium Alloy in Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Toshio Ogawa,Kenzo Asaoka,Jun'ichi Sakai

    Corrosion Science   47   1778 - 1793   2005.04

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  • Hydrogen Embrittlement of Ni-Ti Superelastic Alloy in Ethanol Solution Containing Hydrochloric Acid Reviewed

    Toshio Ogawa,Ken'ichi Yokoyama,Kenzo Asaoka,Jun'ichi Sakai

    Materials Science and Engineering A   393   239 - 246   2005.04

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  • Distribution and Thermal Desorption Behavior of Hydrogen in Titanium Alloys Immersed in Acidic Fluoride Solutions Reviewed

    Toshio Ogawa,Ken'ichi Yokoyama,Kenzo Asaoka,Jun'ichi Sakai

    Journal of Alloys and Compounds   396   269 - 274.   2005.04

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  • Evaluation of Hydrogen Absorption Properties of Ti-0.2% Pd Alloy in Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Toshio Ogawa,Kenzo Asaoka,Jun'ichi Sakai

    Journal of Alloys and Compounds   400   227 - 233   2005.04

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  • Re: Kaneko K et al. Degradation in performance of orthodontic wires caused by hydrogen absorption during short-term immersion in 2.0% acidulated phosphate fluoride solution. Angle Orthod. 2004;74 : 487-495. Response

    Ken'ichi Yokoyama

    The Angle Orthodontist ( E H ANGLE EDUCATION RESEARCH FOUNDATION, INC )   75 ( 1 )   146 - 146   2005.01

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  • Hydrogen Absorption of Titanium in Acidic Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Toshio Ogawa,Kenzo Asaoka,Jun'ichi Sakai

    Materials Science and Engineering A   384   19 - 25   2004.04

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  • Hydrogen Absorption Behavior of Beta Titanium Alloy in Acid Fluoride Solutions Reviewed

    Toshio Ogawa,Ken'ichi Yokoyama,Kenzo Asaoka,Jun'ichi Sakai

    Biomaterials   25   2419 - 2425   2004.04

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  • Fracture Associated with Hydrogen Absorption of Sustained Tensile-Loaded Titanium in Acid and Neutral Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Kazuyuki Kaneko,Youji Miyamoto,Kenzo Asaoka,Jun'ichi Sakai,Michihiko Nagumo

    Journal of Biomedical Materials Research Part A   68A   150 - 158   2004.04

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  • Fracture of Nickel-Titanium Superelastic Alloy in Sodium Hypochlorite Solution Reviewed

    Ken'ichi Yokoyama,Kazuyuki Kaneko,Eiji Yabuta,Kenzo Asaoka,Jun'ichi Sakai

    Materials Science and Engineering A   369   43 - 48   2004.04

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  • Delayed Fracture of Ni-Ti Superelastic Alloys in Acidic and Neutral Fluoride Solutions Reviewed

    Ken'ichi Yokoyama,Kazuyuki Kaneko,Keiji Moriyama,Kenzo Asaoka,Jun'ichi Sakai,Michihiko Nagumo

    Journal of Biomedical Materials Research Part A   69A   105 - 113   2004.04

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  • Degradation in Performance of Orthodontic Wires Caused by Hydrogen Absorption During Short-Term Immersion in 2.0% Acidulated Phosphate Fluoride Solution Reviewed

    Kazuyuki Kaneko,Ken'ichi Yokoyama,Keiji Moriyama,Kenzo Asaoka,Jun'ichi Sakai

    The Angle Orthodontist   74   487 - 495   2004.04

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  • Effects of Constituting Phases in Ni-Ti Shape Memory Alloy on Susceptibility to Hydrogen Embrittlement Reviewed

    Ken'ichi Yokoyama,Tatsuya Eguchi,Kenzo Asaoka,Michihiko Nagumo

    Materials Science and Engineering A   374   177 - 183   2004.04

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  • Degradation of Tensile Strength of Ni-Ti Superelastic Alloy Due to Hydrogen Absorption in Methanol Solution Containing Hydrochloric Acid Reviewed

    Ken'ichi Yokoyama,Toshio Ogawa,Kenzo Asaoka,Jun'ichi Sakai,Michihiko Nagumo

    Materials Science and Engineering A   360   153 - 159   2003.04

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  • Hydrogen Embrittlement of Ni-Ti Superelastic Alloy in Fluoride Solution Reviewed

    Ken'ichi Yokoyama,Kazuyuki Kaneko,Keiji Moriyama,Kenzo Asaoka,Jun'ichi Sakai,Michihiko Nagumo

    Journal of Biomedical Materials Research Part A   65A   182 - 187   2003.04

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  • Susceptibility to Delayed Fracture of Ni-Ti Superelastic Alloy Reviewed

    Ken'ichi Yokoyama,Shiyozo Watabe,Kenichi Hamada,Jun'ichi Sakai,Kenzo Asaoka,Michihiko Nagumo

    Materials Science and Engineering A   341   91 - 97   2003.04

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  • Delayed Fracture of Beta Titanium Orthodontic Wire in Fluoride Aqueous Solutions Reviewed

    Kazuyuki Kaneko,Ken'ichi Yokoyama,Keiji Moriyama,Kenzo Asaoka,Jun'ichi Sakai,Michihiko Nagumo

    Biomaterials   24   2113 - 2120   2003.04

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  • Hydrogen Embrittlement of Nickel-Titanium Alloy in Biological Environment Reviewed

    Kenzo Asaoka,Ken'ichi Yokoyama,Michihiko Nagumo

    Metallurgical and Materials Transactions A   33A   495 - 501   2002.04

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  • Hydrothermal Modification of Titanium Surface in Calcium Solutions Reviewed

    Kenichi Hamada,Masayuki Kon,Takao Hanawa,Ken'ichi Yokoyama,Youji Miyamoto,Kenzo Asaoka

    Biomaterials   23   2265 - 2272   2002.04

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  • Fracture Mechanisms of Retrieved Titanium Screw Thread in Dental Implant Reviewed

    Ken'ichi Yokoyama,Tetsuo Ichikawa,Hiroki Murakami,Youji Miyamoto,Kenzo Asaoka

    Biomaterials   23   2459 - 2465   2002.04

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  • Ni-Ti 超弾性合金の遅れ破壊特性-日本歯科理工学会研究奨励賞-

    Ken'ichi Yokoyama

    DE: The Journal of Dental Engineering ( 日本歯科理工学会 )   139   37 - 38   2001.08

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)

  • Degradation and Fracture of Ni-Ti Superelastic Wire in an Oral Cavity Reviewed

    Ken'ichi Yokoyama,Kenichi Hamada,Keiji Moriyama,Kenzo Asaoka

    Biomaterials   22   2257 - 2262   2001.04

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    Language:English   Publishing type:Research paper (scientific journal)

  • Fracture Analysis of Hydrogen-Charged Nickel-Titanium Superelastic Alloy Reviewed

    Ken'ichi Yokoyama,Kenichi Hamada,Kenzo Asaoka

    Materials Transactions   42   141 - 144   2001.04

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    Language:English   Publishing type:Research paper (scientific journal)

  • Brittle Fracture Initiation Associated with Strain Localization in Heat Affected Zone of a Low Carbon Steel Reviewed

    Ken'ichi Yokoyama,Michihiko Nagumo

    Metallurgical and Materials Transactions A   29A   551 - 558   1998.04

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    Language:Japanese   Publishing type:Research paper (scientific journal)

  • Ti脱酸低炭素鋼溶接熱影響部の靭性に対する熱履歴の効果 Reviewed

    横山賢一,石川寛朗,南雲道彦

    鉄と鋼   84   740 - 746   1998.04

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    Language:Japanese   Publishing type:Research paper (scientific journal)

  • 低炭素鋼溶接熱影響部の靭性試験における荷重低下現象 Reviewed

    横山賢一,南雲道彦

    鉄と鋼   83   323 - 328   1997.04

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    Language:Japanese   Publishing type:Research paper (scientific journal)

  • Ti脱酸低炭素鋼溶接熱影響部の破壊靭性に及ぼす組織の役割 Reviewed

    横山賢一,石川寛朗,南雲道彦

    鉄と鋼   83   803 - 808   1997.04

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    Language:Japanese   Publishing type:Research paper (scientific journal)

  • Microstructures Relevant to Brittle Fracture Initiation at the Heat Affected Zone of Weldment of a Low Carbon Steel Reviewed

    Kenji Ohya,Jongseop Kim,Ken'ichi Yokoyama,Michihiko Nagumo

    Metallurgical and Materials Transactions A   27A   2574 - 2582   1996.04

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    Language:English   Publishing type:Research paper (scientific journal)

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Conference Prsentations (Oral, Poster)

  • 超高強度薄鋼板の遅れ破壊特性と鋼板組織の関係

    高島克利,横山賢一

    自動車技術会2022年春季大会 

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    Event date: 2022.05.25 - 2022.05.27   Language:Japanese  

Grants-in-Aid for Scientific Research

  • 高耐食性合金の腐食に伴う水素吸収が引き起こす特異な脆化挙動と腐食促進

    Grant number:15K06507  2015.04 - 2018.03   基盤研究(C)

  • 生体用金属材料における水素の吸収と存在状態による機能の劣化と誘起

    Grant number:24560885  2012.04 - 2015.03   基盤研究(C)

  • 不働態化金属の水素吸収と脆化に関する電気化学と材料強度学との融合による基礎的研究

    Grant number:21560757  2009.04 - 2012.03   基盤研究(C)

  • 相変態を伴う水素脆性の特徴と機構解明

    Grant number:20760473  2008.04 - 2011.03   若手研究(B)

  • 生体内でのチタン合金の安全確保のための材質劣化のキャラクタリゼイションと機構解明

    Grant number:18560702  2006.04 - 2008.03   基盤研究(C)

  • 生体・口腔環境の過酷腐食性と適合高耐食合金の溶出・環境劣化の評価に関する研究

    Grant number:15560632  2003.04 - 2005.03   基盤研究(C)

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Social activity outside the university

  • マテリアル工学シリーズ①:ものづくりを支える新材料-理学と工学の違いって何だろう?-

    Role(s):Lecturer

    九州大学工業大学  長崎県立佐世保西高等学校  2022.07.28

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    Audience: High school students

    Type:Visiting lecture

  • マテリアル工学シリーズ①:ものづくりを支える新材料-理学と工学の違いって何だろう?-

    Role(s):Lecturer

    九州大学工業大学  愛媛県立伊予高等学校  2022.07.21

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    Audience: High school students

    Type:Visiting lecture

  • 高品質・高性能なものづくりを支える新材料-サイエンスとエンジニアリング-

    2016.12.19

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    Audience: High school students

    Type:Visiting lecture

    愛媛県立松山北高等学校

  • 高品質・高性能なものづくりを支える新材料-サイエンスとエンジニアリング-

    2016.08.26

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    Audience: High school students

    Type:Visiting lecture

    熊本県立天草高等学校

  • 高品質・高性能なものづくりを支える新材料-サイエンスとエンジニアリング-

    2015.07.09

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    Audience: High school students

    Type:Visiting lecture

    広島県立広島皆実高等学校

  • 高性能なものづくりを支える新材料-サイエンスとエンジニアリング-

    2014.11.21

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    Audience: High school students

    Type:Visiting lecture

    山口県立岩国高等学校

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