Papers - YOKOYAMA Ken'ichi
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Electrochemical degradation of the hydrogen-absorption-induced passive film on an Ni–Ti superelastic alloy in an NaCl solution Reviewed International journal
Seo-Young Rho, Jun-Seob Lee, Kuga Ando, Hengjie Zhu, Seung-Hoon Baek, Jae Deok Kim, Jungjae Park, Sung Kang, Ken'ichi Yokoyama
Electrochimica Acta 144022 2024.04
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Delayed fracture enhanced by martensite transformed from retained austenite in ultra-high strength steel sheet Reviewed International journal
Katsutoshi Takashima, Takamasa Nishimura, Ken'ichi Yokoyama, Yoshimasa Funakawa
ISIJ International 742 - 750 2024.04
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 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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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 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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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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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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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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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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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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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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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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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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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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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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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