Personnel Information

写真a

NAKAI Masaaki


Job title

Professor
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Graduating School 【 display / non-display 】

  • Nagoya University, Graduated

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Graduate School 【 display / non-display 】

  • Nagoya University, Doctor's Course, Completed

  • Nagoya University, Master's Course, Completed

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Campus Career 【 display / non-display 】

  • 2025.04
    -
    Now
    Institute of Science Tokyo， -， Institute of Integrated Research， Division of Biomedical Materials， Department of Metallic Biomaterials， Professor
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External Career 【 display / non-display 】

  • 2010
    -
    2016
    , Associate Professor
  • 2016
    -
    2021
    Kindai University, Department of Mechanical Engineering, Faculty of Science and Engineering, Associate Professor
  • 2021
    -
    2025
    Kindai University, Department of Mechanical Engineering, Faculty of Science and Engineering, Professor
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Academic Society Affiliations 【 display / non-display 】

  • THE JAPAN INSTITUTE OF METALS AND MATERIALS

  • THE JAPAN INSTITUTE OF LIGHT METALS

  • THE IRON AND STEEL INSTITUTE OF JAPAN

  • The Japan Institute of Titanium

  • THE JAPANESE SOCIETY FOR BIOMATERIALS

  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

  • JAPAN FOUNDRY ENGINEERING SOCIETY

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Research Areas 【 display / non-display 】

  • Biomaterials

  • Structural materials and functional materials

  • Mechanics of materials and materials

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Research Theme 【 display / non-display 】

  • Open atmospheric nitridation on a metallic surface using laser irradiation, 2021.07 - 2024.03

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Published Papers & Misc 【 display / non-display 】

  1. Ueki, K; Mizutani, Y; Nakajima, T; Ueda, K; Narushima, T; Nakai, M. Formation of unique heterogeneous microstructure in biomedical Co-Cr-W-Ni-C alloys by mechanical milling and heat treatment processes JOURNAL OF ALLOYS AND COMPOUNDS. 2025.07; 1036 181631. ( DOI )

  2. Charles Gama, Wael Khair-Eldeen, Masaaki Nakai, Mohamed Abdel Hady Gepreel. Effect of Cold Rolling and Annealing on Grain Refinement of β-Type Ti-13Nb-1.5Ta-3Mo Titanium Alloy Key Engineering Materials. 2025.06; 1018 3-8. ( DOI )

  3. Nakai, M; Iwasaki, T; Kisaichi, K; Ueki, K. Effects of Dimple Surface Texturing on Wear Characteristics of Commercially Pure Ti in Comparison with Ti-6Al-4V ELI and Ti-29Nb-13Ta-4.6Zr Alloys for Dental Applications MATERIALS TRANSACTIONS. 2025.05; 66 (5): 577-583. ( DOI )

  4. Ueki, K; Hida, A; Nakai, M. Effects of Fe addition on the mechanical and corrosive properties of biomedical Co-Cr-W-Ni alloys for balloon-expandable stents JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS. 2024.12; 160 106714. ( PubMed, DOI )

  5. Nakai, M; Nagaya, K; Ueki, K; Kyogoku, H. Vibration absorption of as-built and post-heat-treated Ti-6Al-4V alloy fabricated by laser powder bed fusion additive manufacturing JOURNAL OF METALS MATERIALS AND MINERALS. 2024.09; 34 (3): 1963. ( DOI )

  6. Koichi Kobayashi, Makoto Sakamoto, Keisuke Sasagawa, Masaaki Nakai, Masashi Okamoto, Kazuhiro Hasegawa, Kengo Narita. Assessment of spinal alignment in standing position using Biplanar X-ray images and three-dimensional vertebral models Porto Biomedical Journal. 2024.05; 9 (3): 256. ( DOI )

  7. Kosuke Ueki, Kyosuke Ueda, Masaaki Nakai, Takayoshi Nakano, Takayuki Narushima. Improvement of Work-Hardening Behavior of Co-Cr-W-Ni Alloy by Adding Mn/Fe for Balloon-Expandable Stents Key Engineering Materials. 2023.12; 967 115-120. ( DOI )

  8. Li, Q; Liu, Y; Yu, HH; Nakai, M; Niinomi, M; Yamanaka, K; Chiba, A; Ishimoto, T; Nakano, T. Effect of O addition on microstructure and mechanical properties of Ti-Nb alloys with various β stability VACUUM. 2023.09; 215 112311. ( DOI )

  9. Ueki, K; Hirano, R; Nakai, M. Development of biodegradable Fe-Mn-Mg alloys by mechanical alloying and spark plasma sintering MATERIALS TODAY COMMUNICATIONS. 2023.03; 34 105465. ( DOI )

  10. Yilmazer, H; Caha, I; Dikici, B; Toptan, F; Isik, M; Niinomi, M; Nakai, M; Alves, AC. Investigation of the Influence of High-Pressure Torsion and Solution Treatment on Corrosion and Tribocorrosion Behavior of CoCrMo Alloys for Biomedical Applications CRYSTALS. 2023.03; 13 (4): 590. ( DOI )

  11. Nakai, M; Narita, K; Kobayashi, K; Sasagawa, K; Niinomi, M; Hasegawa, K. Concept and Fabrication of Beta-Type Titanium Alloy Rod with Parts Possessing Different Young's Moduli for Spinal Fixation MATERIALS TRANSACTIONS. 2023.01; 64 (1): 147-154. ( DOI )

  12. Takeda, S; Ueki, K; Ueda, K; Nakai, M; Nakano, T; Narushima, T. Improvement of mechanical properties of Co-Cr-W-Ni alloy tube suitable for balloon-expandable stent applications through heat treatment MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. 2023.01; 862 144505. ( DOI )

  13. Abdullah, NB; Miyazaki, D; Yamamoto, E; Ueki, K; Nakai, M. Effect of titanium plate stiffness on bone healing in rabbit femur MECHANICAL ENGINEERING JOURNAL. 2022.12; 9 (6): 22-00282-00282. ( DOI )

  14. Abdullah, NB; Miyazaki, D; Yamamoto, E; Ueki, K; Nakai, M. Effect of low modulus titanium plate fixation on rabbit femur bone healing JOURNAL OF MATERIALS RESEARCH. 2022.08; 37 (16): 2536-2545. ( DOI )

  15. Yigit, O; Dikici, B; Kaseem, M; Nakai, M; Niinomi, M. Facile formation with HA/Sr-GO-based composite coatings via green hydrothermal treatment on β-type TiNbTaZr alloys: Morphological and electrochemical insights JOURNAL OF MATERIALS RESEARCH. 2022.08; 37 (16): 2515-2524. ( DOI )

  16. Li, Q; Huang, Q; Li, JJ; He, QF; Nakai, M; Zhang, K; Niinomi, M; Yamanaka, K; Chiba, A; Nakano, T. Microstructure and mechanical properties of Ti-Nb-Fe-Zr alloys with high strength and low elastic modulus TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA. 2022.02; 32 (2): 503-512. ( DOI )

  17. Zarka, M; Dikici, B; Niinomi, M; Ezirmik, KV; Nakai, M; Kaseem, M. The Ti3.6Nb1.0Ta0.2Zr0.2 coating on anodized aluminum by PVD: A potential candidate for short-time biomedical applications VACUUM. 2021.10; 192 Article ID 110450. ( DOI )

  18. Yanagihara, S; Ueki, K; Ueda, K; Nakai, M; Nakano, T; Narushima, T. Development of Low-Yield Stress Co-Cr-W-Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE. 2021.09; 52 (9): 4137-4145. ( DOI )

  19. Nakai, M; Iwasaki, T; Ueki, K. Differences in the effect of surface texturing on the wear loss of β-type TiNbTaZr and (α plus β)-type Ti6Al4V ELI alloys in contact with zirconia in physiological saline solution JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS. 2021.09; 124 104808. ( PubMed, DOI )

  20. Li, Q; Sun, H; Li, JJ; Yuan, XF; Nakai, M; Niinomi, M; Nakano, T. Influence of Sintering Temperature on Mechanical Properties of Ti-Nb-Zr-Fe Alloys Prepared by Spark Plasma Sintering JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE. 2021.08; 30 (8): 5719-5727. ( DOI )

  21. Li, Q; Yang, JS; Li, JJ; Zhang, R; Nakai, M; Niinomi, M; Nakano, T. Antibacterial Cu-Doped Calcium Phosphate Coating on Pure Titanium MATERIALS TRANSACTIONS. 2021.07; 62 (7): 1052-1055. ( DOI )

  22. Ueki, K; Yanagihara, S; Ueda, K; Nakai, M; Nakano, T; Narushima, T. Improvement of Mechanical Properties by Microstructural Evolution of Biomedical Co-Cr-W-Ni Alloys with the Addition of Mn and Si MATERIALS TRANSACTIONS. 2021.02; 62 (2): 229-238. ( DOI )

  23. Zarka, M; Dikici, B; Niinomi, M; Ezirmik, KV; Nakai, M; Yilmazer, H. A systematic study of β-type Ti-based PVD coatings on magnesium for biomedical application VACUUM. 2021.01; 183 ( DOI )

  24. Kosuke Ueki, Soh Yanagihara, Kyosuke Ueda, Masaaki Nakai, Takayoshi Nakano, Takayuki Narushima. Improvement of strength and ductility by combining static recrystallization and unique heat treatment in Co-20Cr-15W-10Ni alloy for stent application Materials Science Forum. 2021.01; 1016 1503-1509. ( DOI )

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Conference Activities & Talks 【 display / non-display 】

  1. Kosuke Ueki, Tomoki Nakajima, Kyosuke Ueda, Masaaki Nakai, Takayuki Narushima. Fabrication of Co-Cr-W-Ni alloys with a unique heterogeneous microstructure utilizing carbide precipitation. 13th International Conference on Processing & Manufacturing of Advanced Materials (THERMEC'2025) 2025.07.03

  2. Masaaki Nakai, Kosuke Ueki, Takahisa Shiraishi, Takanori Kiguchi. High fatigue limit / tensile strength ratio of beta-type Ti-Cr alloy for biomedical applications. 13th International Conference on Processing & Manufacturing of Advanced Materials (THERMEC'2025) 2025.06.30

  3. Charles Gama, Wael Khair-Eldeen, Mohamed A.H. Gepreel, Masaaki Nakai. Effect of cold rolling and annealing on grain refinement of β-type Ti-13Nb-1.5Ta-3Mo titanium alloy. 13th International Conference on Engineering and Innovative Materials (13th ICEIM) 2024.09

  4. Kosuke Ueki, Akira Hida, Kyosuke Ueda, Masaaki Nakai, Takayuki Narushima. Development of high-performance Co-Cr based alloy for next-generation balloon-expandable stent. 2nd International conference on Materials science, Engineering and Technology 2024.09

  5. Norain Binti Abdullah, Daisuke Miyazaki, Ei Yamamoto, Masaaki Nakai, Tamio Ida. Effect of titanium implant plate fixation with different stiffness on defect healing of rabbit femur bone. Malaysia-Japan Visionaries Conference 2024 (MJVC 2024) 2024.09

  6. Masaaki Nakai, Daisuke Miyazaki, Hiroya Ishii, Norain Binti Abdullah, Kosuke Ueki, Ei Yamamoto. Effect of fixation using implant plates made of titanium alloys with different Young's moduli on callus formation during bone healing. 7th Kuala Lumpur International Conference on Biomedical Engineering 2024 and 8th Asian Prosthetic & Orthotic Scientific meeting 2024 (BioMed-APOSM2024) 2024.08

  7. Natsumi Kinouchi, Yasuhiro Aoki, Kohsaku Ushioda, Masaaki Nakai, Hidetoshi Fujii. Microstructures and mechanical properties of low-temperature linear friction welded near β Ti -17 alloy joint. 77th IIW Annual Assembly and International Conference on Welding and Joining 2024.07

  8. Masaaki Nakai, Takeshi Iwasaki, Kosuke Kisaichi, Kosuke Ueki. Effects of laser-processed surface texturing on wear behaviors of titanium alloys in contact with zirconia for dental applications. European Association on Applications of Surface and Interface Analysis (ECASIA'24) 2024.06

  9. Masaaki Nakai, Kohei Nagaya, Kosuke Ueki, Hideki Kyogoku. Vibration absorption of as-built and solution-treated Ti-6Al-4V alloy fabricated by laser powder bed fusion additive manufacturing. The 6th International Conference on Applied Physics and Materials Applications (ICAPMA2023) 2023.12

  10. Norain Binti Abdullah, Daisuke Miyazaki, Ei Yamamoto, Kosuke Ueki, Masaaki Nakai, Tamio Ida. Effect of a newly developed titanium implant plate fixation on new bone formation during early stage of healing. The 12th Asian Pacific Conference on Biomechanics (AP-BIOMECH 2023) 2023.11

  11. K. Ueki, R. Hirano, M. Nakai. Effect of Mg addition on mechanical and corrosive properties of biodegradable Fe-Mn alloy fabricated by mechanical alloying and spark plasma sintering. Biomaterials International 2023 2023.07

  12. Masaaki Nakai, Takeshi Iwasaki, Kosuke Ueki. Wear properties of biomedical titanium alloys with dimple textured surface through laser processing. Thermec'2023 2023.07

  13. Kosuke Ueki, Kyosuke Ueda, Masaaki Nakai, Takayoshi Nakano, Takayuki Narushima. Improvement of work-hardening behavior of Co-Cr-W-Ni alloy by adding Mn / Fe for balloon-expandable stents. Thermec'2023 2023.07

  14. Masaaki Nakai, Kengo Narita, Mitsuo Niinomi. Heat treatment to fabricate beta-type titanium alloy rod with partially different Young’s modulus for spinal fixation applications. World Titanium Conference 2023 (Ti-2023) 2023.06

  15. Norain Binti Abdullah, Daisuke Miyazaki, Ei Yamamoto, Kosuke Ueki, Masaaki Nakai. Effects of elastic modulus differences between titanium alloys and bone on bone formation during early stage of healing. 第61回日本生体医工学会大会2022 2022.06

  16. Masaaki Nakai. Effect of dimple texture on wear behaviors of β-type Ti-Nb-Ta-Zr and (α+β)-type Ti-6Al-4V ELI alloys in contact with zirconia for biomedical applications. 2nd International Symposium on Light Alloys and Composite Materials (2nd UHAKS) 2022.03

  17. Norain Binti Abdullah, Daisuke Miyazaki, Masaaki Nakai, Kosuke Ueki, Ei Yamamoto. Effects of titanium plate fixation on callus formation during early stage of bone healing. 第4回日本金属学会第７分野講演会 2021.12

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