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柳樂 知也

柳樂 知也 (NAGIRA, Tomoya) 0000-0002-2415-0623

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305-0047 茨城県つくば市千現1-2-1 [アクセス]
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論文 TSV

2026
  1. Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Tomoya Nagira, Susumu Takamori, Satoshi Emura, Yasuhiko Inoue. Low cycle fatigue and microstructures of Fe–15Mn–11Cr–7.5Ni–4Si alloy. Materials Science and Engineering: A. 949 (2026) 149457 10.1016/j.msea.2025.149457
  2. Takayuki Yamashita, Tomoya Nagira, Wu Gong, Takuro Kawasaki, Stefanus Harjo, Kohsaku Ushioda, Hidetoshi Fujii. Evaluation of Residual Stress Distribution in Linear Friction Welded Steel Joint via Neutron Diffraction Mapping Measurement. ISIJ International. 66 [5] (2026) ISIJINT-2025-405 10.2355/isijinternational.isijint-2025-405 Open Access
2025
  1. 柳樂 知也, 中村 照美, 澤口 孝宏, 森 正和, 森貞 好昭, 藤井 英俊. Fe-15Mn-10Cr-8Ni-4Si制振ダンパー合金の摩擦攪拌接合. 鉄と鋼. 111 [17] (2025) 1046-1056 10.2355/tetsutohagane.tetsu-2024-127 Open Access
  2. 山下 享介, 柳樂 知也, ゴン ウー, 川崎 卓郎, ハルヨ ステファヌス, 潮田 浩作, 藤井 英俊. 中性子回折マッピング測定法を用いた線形摩擦接合鋼継手の残留応力分布評価. 鉄と鋼. 111 [17] (2025) 1057-1071 10.2355/tetsutohagane.tetsu-2025-042 Open Access
  3. Tomoya Nagira, Houichi Kitano, Takashi Kimura, Fumiyoshi Yoshinaka, Susumu Takamori, Takahiro Sawaguchi, Takayuki Yamashita, Yasuhiro Aoki, Hidetoshi Fujii. In situ synchrotron X-ray imaging of curved columnar growth and ripple formation in Fe-Mn-Cr-Ni-Si alloy during GTA welding. Science and Technology of Welding and Joining. 30 [4] (2025) 296-304 10.1177/13621718251360932 Open Access
  4. Kazuma Shimizu, Shota Nakayama, Hiroto Shoji, Takumi Kawakubo, Tomoya Nagira, Mitsuru Ohata, Hidetoshi Fujii. Significance of fracture toughness for linear friction welded joint of weathering steel. Welding in the World. 69 [3] (2025) 739-750 10.1007/s40194-024-01890-7 Open Access
2024
  1. Tomoya Nagira, Terumi Nakamura, Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Yasuhiko Inoue. Microstructure and Mechanical Properties of Gas Metal Arc-welded Fe–Mn–Si Seismic Damping Alloy. ISIJ International. 64 [11] (2024) ISIJINT-2024-174 10.2355/isijinternational.isijint-2024-174 Open Access
  2. Fumiyoshi Yoshinaka, Yusuke Tsutsumi, Tomoya Nagira, Susumu Takamori, Satoshi Emura, Takahiro Sawaguchi, Hideki Katayama, Terumi Nakamura, Yasuhiko Inoue, Susumu Motomura, Atsumichi Kushibe. Effects of the Cr and Ni Concentrations on the Fatigue and Corrosion Resistances of Fe–Mn–Cr–Ni–Si Alloys for Seismic Damping Applications. ISIJ International. 64 [7] (2024) ISIJINT-2023-437 10.2355/isijinternational.isijint-2023-437 Open Access
  3. Houichi Kitano, Tomoya Nagira, Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Takayuki Yamashita, Yasuhiro Aoki, Hidetoshi Fujii. Development of a method to evaluate strain in weld solidification using in-situ observations with high-brightness synchrotron X-rays. Science and Technology of Advanced Materials: Methods. 4 [1] (2024) 2403964 10.1080/27660400.2024.2403964 Open Access
  4. Tomoya Nagira, Houichi Kitano, Takashi Kimura, Fumiyoshi Yoshinaka, Susumu Takamori, Takahiro Sawaguchi, Takayuki Yamashita, Yasuhiro Aoki, Hidetoshi Fujii, Akihisa Takeuchi, Masayuki Uesugi. In-situ observation of solidification behaviors of Fe-Mn-Cr-Ni-Si alloy during TIG melt-run welding using synchrotron radiation X-ray. Materials Characterization. 214 (2024) 114093 10.1016/j.matchar.2024.114093 Open Access
2023
  1. Tomoya Nagira, Terumi Nakamura, Takashi Kimura, Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Takayuki Yamashita, Yasuhiro Aoki, Hidetoshi Fujii. Elucidation of solidification mode of Fe-Mn-Si alloy during TIG spot welding using synchrotron X-ray. QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY. 41 [2] (2023) 1s-5s 10.2207/qjjws.41.1s Open Access
  2. Tomoya Nagira, Terumi Nakamura, Takahiro Sawaguchi, Masakazu Mori, Yoshiaki Morisada, Hidetoshi Fujii. Friction Stir Welding of Fe-15Mn-10Cr-8Ni-4Si Seismic Damping Alloy. ISIJ International. 63 [12] (2023) ISIJINT-2023-305 10.2355/isijinternational.isijint-2023-305 Open Access
  3. Zexi Wu, Tomoya Nagira, Kohsaku Ushioda, Goro Miyamoto, Hidetoshi Fujii. Microstructures and Tensile Properties of Friction Stir Welded 0.2%C-2%Si-Cr Steels. ISIJ International. 63 [6] (2023) ISIJINT-2023-047 10.2355/isijinternational.isijint-2023-047 Open Access
  4. 柳樂 知也. FSW/FSP研究の現状. 溶接学会誌. 92 [5] (2023) 330-331 10.2207/jjws.92.330
  5. 吉中 奎貴, 澤口 孝宏, 高森 晋, 江村 聡, 中村 照美, 柳樂 知也, 櫛部 淳道, 井上 泰彦, 本村 達. 高疲労耐久性を有する溶接組立制振ダンパーを実現するFe-Mn-Cr-Ni-Si合金の開発. まてりあ. 62 [4] (2023) 229-236 10.2320/materia.62.229
2022
  1. 伍 沢西, 柳楽 知也, 潮田 浩作, 宮本 吾郎, 藤井 英俊. 摩擦攪拌合した0.2%C-2%Si-Cr鋼の組織と機械的性質. 鉄と鋼. 108 [12] (2022) 911-925 10.2355/tetsutohagane.tetsu-2022-038 Open Access
  2. Tomoya Nagira, Terumi Nakamura, Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Yasuhiro Aoki, Masayoshi Kamai, Hidetoshi Fujii, Akihisa Takeuchi, Masayuki Uesugi. Direct observation of solidification behaviors of Fe-Mn-Si alloys during TIG spot welding using synchrotron X-ray. Scripta Materialia. 216 (2022) 114743 10.1016/j.scriptamat.2022.114743
2021
  1. 西村 友宏, 松林 領汰, 森下 浩平, 吉矢 真人, 柳樂 知也, 安田 秀幸. Fe - 18 mass%Cr - Ni alloys 合金（Ni組成：8, 11, 14, 20 mass%）における準安定δ相の核生成によるマッシブ的変態の選択. 鉄と鋼. 107 [7] (2021) 558-565 10.2355/tetsutohagane.tetsu-2021-020 Open Access
  2. Takumi Kawakubo, Tomoya Nagira, Kohsaku Ushioda, Hidetoshi Fujii. Friction Stir Welding of High Phosphorus Weathering Steel —Weldabilities, Microstructural Evolution and Mechanical Properties. ISIJ International. 61 [7] (2021) ISIJINT-2021-007 10.2355/isijinternational.isijint-2021-007 Open Access
  3. Tomoya Nagira, Xiaochao Liu, Kohasaku Ushioda, Hidetoshi Fujii. Microstructural Evolutions of 2N Grade Pure Al and 4N Grade High-Purity Al during Friction Stir Welding. Materials. 14 [13] (2021) 3606 10.3390/ma14133606 Open Access
  4. Tomoya Nagira, Daisuke Yamashita, Masayoshi Kamai, Huihong Liu, Yasuhiro Aoki, Kentaro Uesugi, Akihisa Takeuchi, Hidetoshi Fujii. In situ observation of solidification crack propagation for type 310S and 316L stainless steels during TIG welding using synchrotron X-ray imaging. Journal of Materials Science. 56 [17] (2021) 10653-10663 10.1007/s10853-021-05969-0
  5. Zexi Wu, Tomoya Nagira, Kohsaku Ushioda, Goro Miyamoto, Hidetoshi Fujii. Microstructures and tensile properties of friction stir welded 0.2%C–Si–Mn steel. Materials Science and Engineering: A. 799 (2021) 140068 10.1016/j.msea.2020.140068
2020
  1. 川久保 拓海, 柳楽 知也, 潮田 浩作, 藤井 英俊. 高P耐候性鋼の摩擦攪拌接合-その接合性,組織の発達および機械的特性-. 鉄と鋼. 106 [12] (2020) 892-901 10.2355/tetsutohagane.tetsu-2020-057 Open Access
  2. 柳樂 知也. Al-Cu合金における凝固組織に及ぼす音響流の影響. 超音波TECHNO. (2020) 40-44
  3. T. Nagira, X.C. Liu, K. Ushioda, H. Fujii. Mechanism of grain structure development for pure Cu and Cu-30Zn with low stacking fault energy during FSW. Science and Technology of Welding and Joining. 25 [8] (2020) 669-678 10.1080/13621718.2020.1818032
  4. T. Nagira, D. Yamashita, M. Kamai, H. Liu, Y. Aoki, H. Fujii, K. Uesugi, A. Takeuchi. Time-resolved X-ray imaging of solidification cracking for Al-Cu alloy at the weld crater. Materials Characterization. 167 (2020) 110469 10.1016/j.matchar.2020.110469
  5. Xiaochao Liu, Yufeng Sun, Tomoya Nagira, Kohsaku Ushioda, Hidetoshi Fujii. Effect of Stacking Fault Energy on the Grain Structure Evolution of FCC Metals During Friction Stir Welding. Acta Metallurgica Sinica (English Letters). 33 [7] (2020) 1001-1012 10.1007/s40195-020-01064-6
  6. T. Nagira, X. C. Liu, K. Ushioda, H. Fujii. Influences of temperature and Sn-addition on microstructural evolution of Ag during FSW. Science and Technology of Welding and Joining. 25 [3] (2020) 198-207 10.1080/13621718.2019.1665859
2019
  1. Tomohiro Nishimura, Ryota Matsubayashi, Kohei Morishita, Masato Yoshiya, Tomoya Nagira, Hideyuki Yasuda. Selection of the Massive-like δ-γ Transformation due to Nucleation of Metastable δ Phase in Fe-18 Mass%Cr-Ni Alloys with Ni Contents of 8, 11, 14 and 20 Mass%. ISIJ International. 59 [3] (2019) 459-465 10.2355/isijinternational.isijint-2018-726 Open Access
  2. Tomohiro Nishimura, Kohei Morishita, Masato Yoshiya, Tomoya Nagira, Hideyuki Yasuda. Time-resolved and In-situ Observation of δ-γ Transformation during Unidirectional Solidification in Fe-C Alloys. Tetsu-to-Hagane. 105 [2] (2019) 290-298 10.2355/tetsutohagane.tetsu-2018-145 Open Access
  3. T. Nagira, X. C. Liu, K. Ushioda, Y. Iwamoto, G. Ano, H. Fujii. Role of annealing twinning in microstructural evolution of high purity silver during friction stir welding. Science and Technology of Welding and Joining. 24 [7] (2019) 644-651 10.1080/13621718.2019.1592931
  4. X.C. Liu, Y.F. Sun, T. Nagira, K. Ushioda, H. Fujii. Evaluation of dynamic development of grain structure during friction stir welding of pure copper using a quasi in situ method. Journal of Materials Science & Technology. 35 [7] (2019) 1412-1421 10.1016/j.jmst.2019.01.018
  5. X.C. Liu, Y.F. Sun, T. Nagira, K. Ushioda, H. Fujii. Strain rate dependent micro-texture evolution in friction stir welding of copper. Materialia. 6 (2019) 100302 10.1016/j.mtla.2019.100302
2018
  1. X. C. Liu, Y. F. Sun, T. Nagira, K. Ushioda, H. Fujii. Microstructure evolution of Cu–30Zn during friction stir welding. Journal of Materials Science. 53 [14] (2018) 10423-10441 10.1007/s10853-018-2313-5
  2. X.C. Liu, Y.F. Sun, T. Nagira, H. Fujii. Investigation of temperature dependent microstructure evolution of pure iron during friction stir welding using liquid CO2 rapid cooling. Materials Characterization. 137 (2018) 24-38 10.1016/j.matchar.2018.01.004
2017
  1. Iori Uwabe, Kento Dobara, Kohei Morishita, Tomoya Nagira, Hideyuki Yasuda. In-situ Measurement of Solute Partition Coefficient in Fe-Cr-Ni-Mo Alloys by Using X-ray Imaging and X-ray Florescence Analysis. Tetsu-to-Hagane. 103 [12] (2017) 678-687 10.2355/tetsutohagane.tetsu-2017-077 Open Access
  2. K.M. Kareh, C. O'Sullivan, T. Nagira, H. Yasuda, C.M. Gourlay. Dilatancy in semi-solid steels at high solid fraction. Acta Materialia. 125 (2017) 187-195 10.1016/j.actamat.2016.11.066
2016
  1. Tomoya Nagira, Noriaki Nakatsuka, Hideyuki Yasuda, Kentaro Uesugi, Akihisa Takeuchi. In situ Observation of Dendrite Growth in Sn-Bi Alloys under Ultrasonic Vibration Using Time-resolved X-ray Imaging. Tetsu-to-Hagane. 102 [3] (2016) 170-178 10.2355/tetsutohagane.tetsu-2015-080 Open Access
2015
  1. Masato Yoshiya, Manabu Watanabe, Kenta Nakajima, Nobufumi Ueshima, Koki Hashimoto, Tomoya Nagira, Hideyuki Yasuda. Concurrent γ-Phase Nucleation as a Possible Mechanism of δ-γ Massive-like Phase Transformation in Carbon Steel: Numerical Analysis Based on Effective Interface Energy. MATERIALS TRANSACTIONS. 56 [9] (2015) 1467-1474 10.2320/matertrans.ma201569
  2. Masato Yoshiya, Kenta Nakajima, Manabu Watanabe, Nobufumi Ueshima, Tomoya Nagira, Hideyuki Yasuda. Interface Energies of Hetero- and Homo-Phase Boundaries and Their Impact on δ-γ Massive-Like Phase Transformations in Carbon Steel. MATERIALS TRANSACTIONS. 56 [9] (2015) 1461-1466 10.2320/matertrans.ma201568
  3. Yosuke Suzuki-Yamamoto, Ryota Ozaki, Masato Yoshiya, Tomoya Nagira, Hideyuki Yasuda. Yet Another Marked Difference among Impurities as Modifier Elements for Refinement of Eutectic Si in Al-Si Alloys. MATERIALS TRANSACTIONS. 56 [9] (2015) 1475-1483 10.2320/matertrans.ma201576
  4. K. Yamane, Hideyuki Yasuda, A. Sugiyama, T. Nagira, M. Yoshiya, K. Morishita, K. Uesugi, A. Takeuchi, Y. Suzuki. Influence of Mg on Solidification of Hypereutectic Cast Iron: X-ray Radiography Study. Metallurgical and Materials Transactions A. 46 [11] (2015) 4937-4946 10.1007/s11661-015-3077-z
  5. Tomoya Nagira, Noriaki Nakatsuka, Hideyuki Yasuda, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki. Impact of melt convection induced by ultrasonic wave on dendrite growth in Sn–Bi alloys. Materials Letters. 150 (2015) 135-138 10.1016/j.matlet.2015.02.069
  6. M Yoshiya, M Sato, M Watanabe, K Nakajima, T Yokoi, N Ueshima, T Nagira, H Yasuda. Impacts of Interface Energies and Transformation Strain from BCC to FCC on Massive-like δ-γ Transformation in Steel. IOP Conference Series: Materials Science and Engineering. 84 (2015) 012049 10.1088/1757-899x/84/1/012049 Open Access
  7. T Nagira, S Morita, H Yasuda, C M Gourlay, M Yoshiya, A Sugiyama, K Uesugi. Localization of shear strain and shear band formation induced by deformation in semi-solid Al-Cu alloys. IOP Conference Series: Materials Science and Engineering. 84 (2015) 012078 10.1088/1757-899x/84/1/012078 Open Access
  8. S Morita, H Yasuda, T Nagira, C M Gourlay, K Morishita, M Yoshiya, A Sugiyama. Application of a macroscopic model to predict the band segregation induced by shear deformation of semisolid. IOP Conference Series: Materials Science and Engineering. 84 (2015) 012011 10.1088/1757-899x/84/1/012011 Open Access
  9. T Nishimura, K Morishita, T Nagira, M Yoshiya, H Yasuda. Kinetics of the δ/γ interface in the massive-like transformation in Fe-0.3C-0.6Mn-0.3Si alloys. IOP Conference Series: Materials Science and Engineering. 84 (2015) 012062 10.1088/1757-899x/84/1/012062 Open Access
2014
  1. Tomoya Nagira, Shugo Morita, Hiroyoshi Yokota, Hideyuki Yasuda, Christopher M. Gourlay, Masato Yoshiya, Akira Sugiyama, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki. In Situ Observation of Deformation in Semi-solid Fe-C Alloys at High Shear Rate. Metallurgical and Materials Transactions A. 45 [12] (2014) 5613-5623 10.1007/s11661-014-2489-5
2013
  1. Tomoya Nagira, Hiroyoshi Yokota, Shugo Morita, Hideyuki Yasuda, Masato Yoshiya, C.M. Gourlay, Akira Sugiyama, Kentarou Uesugi, Keiji Umetani. Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-Solid Al-Cu Alloys and Water-Particle Mixture. Tetsu-to-Hagane. 99 [2] (2013) 141-148 10.2355/tetsutohagane.99.141 Open Access
  2. Tomoya Nagira, Hiroyoshi Yokota, Shugo Morita, Hideyuki Yasuda, Masato Yoshiya, Christopher M. Gourlay, Akira Sugiyama, Kentarou Uesugi, Keiji Umetani. Characterization of Shear Deformation Based on In-situ Observation of Deformation in Semi-solid Al–Cu Alloys and Water-particle Mixture. ISIJ International. 53 [7] (2013) 1195-1201 10.2355/isijinternational.53.1195 Open Access
  3. Kazuhiro Nogita, Hideyuki Yasuda, Arvind Prasad, Stuart D. McDonald, Tomoya Nagira, Noriaki Nakatsuka, Kentaro Uesugi, David H. StJohn. Real time synchrotron X-ray observations of solidification in hypoeutectic Al–Si alloys. Materials Characterization. 85 (2013) 134-140 10.1016/j.matchar.2013.08.015
  4. J. Fonseca, C. O’Sullivan, T. Nagira, H. Yasuda, C.M. Gourlay. In situ study of granular micromechanics in semi-solid carbon steels. Acta Materialia. 61 [11] (2013) 4169-4179 10.1016/j.actamat.2013.03.043
2012
  1. Tomoya Nagira, Hideyuki Yasuda, Takumi Sakimura, Kentarou Yoshida. Solidification of Al2O3–YAG eutectic composites with off-metastable eutectic composition from undercooled melt produced by melting Al2O3–YAP eutectics. Journal of the European Ceramic Society. 32 [10] (2012) 2137-2143 10.1016/j.jeurceramsoc.2012.02.007
  2. S Morita, H Yasuda, T Nagira, C M Gourlay, M Yoshiya, A Sugiyama. Macroscopic modelling of semisolid deformation for considering segregation bands induced by shear deformation. IOP Conference Series: Materials Science and Engineering. 33 (2012) 012053 10.1088/1757-899x/33/1/012053
  3. H Yasuda, T Nagira, M Yoshiya, A Sugiyama, N Nakatsuka, M Kiire, M Uesugi, K Uesugi, K Umetani, K Kajiwara. Massive transformation fromδphase toγphase in Fe–C alloys and strain induced in solidifying shell. IOP Conference Series: Materials Science and Engineering. 33 (2012) 012036 10.1088/1757-899x/33/1/012036
  4. H Yasuda, T Nagira, M Yoshiya, M Uesugi, N Nakatsuka, M Kiire, A Sugiyama, K Uesugi, K Umetani. In-situobservation of peritectic solidification in Sn-Cd and Fe-C alloys. IOP Conference Series: Materials Science and Engineering. 27 (2012) 012084 10.1088/1757-899x/27/1/012084
2011
  1. Hideyuki Yasuda, Tomoya Nagira, Masato Yoshiya, Noriaki Nakatsuka, Akira Sugiyama, Kentaro Uesugi, Keiji Umetani. Development of X-ray Imaging for Observing Solidification of Carbon Steels. ISIJ International. 51 [3] (2011) 402-408 10.2355/isijinternational.51.402 Open Access
  2. C.M. Gourlay, A.K. Dahle, T. Nagira, N. Nakatsuka, K. Nogita, K. Uesugi, H. Yasuda. Granular deformation mechanisms in semi-solid alloys. Acta Materialia. 59 [12] (2011) 4933-4943 10.1016/j.actamat.2011.04.038
  3. C.M. Gourlay, K. Nogita, A.K. Dahle, Y. Yamamoto, K. Uesugi, T. Nagira, M. Yoshiya, H. Yasuda. In situ investigation of unidirectional solidification in Sn–0.7Cu and Sn–0.7Cu–0.06Ni. Acta Materialia. 59 [10] (2011) 4043-4054 10.1016/j.actamat.2011.03.028
  4. T. Nagira, C.M. Gourlay, A. Sugiyama, M. Uesugi, Y. Kanzawa, M. Yoshiya, K. Uesugi, K. Umetani, H. Yasuda. Direct observation of deformation in semi-solid carbon steel. Scripta Materialia. 64 [12] (2011) 1129-1132 10.1016/j.scriptamat.2011.03.009
2010
  1. Hideyuki Yasuda, S. Kato, T. Shinba, T. Nagira, M. Yoshiya, Akira Sugiyama, K. Umetani, Kentaro Uesugi. Regular Structure Formation of Hypermonotectic Al-In Alloys. Materials Science Forum. 649 (2010) 131-136 10.4028/www.scientific.net/msf.649.131
2009
  1. Tomoya Nagira, Hideyuki Yasuda, Satoshi Takeshima, Takumi Sakimura, Yoshiharu Waku, Kentaro Uesugi. Chain structure in the unidirectionally solidified Al2O3–YAG–ZrO2 eutectic composite. Journal of Crystal Growth. 311 [14] (2009) 3765-3770 10.1016/j.jcrysgro.2009.05.004
  2. Noriaki Nakatsuka, Hideyuki Yasuda, Tomoya Nagira, Masato Yoshiya. Three-dimensional alignment of FeSi2with orthorhombic symmetry by an anisotropic magnetic field. Journal of Physics: Conference Series. 165 (2009) 012021 10.1088/1742-6596/165/1/012021 Open Access
  3. Tomoya Nagira, Hideyuki Yasuda, Masato Yoshiya. Formation and microstructure of Al2O3-YAG eutectic ceramics by phase transformation from metastable system to equilibrium system. Journal of Physics: Conference Series. 165 (2009) 012006 10.1088/1742-6596/165/1/012006 Open Access
  4. H Yasuda, D Nagamatsu, T Yoshimoto, T Nagira, M Yoshiya, Y Yokoyama, A Inoue. Crystal growth in the bulk-metallic-glass Zr-based alloys by using the DC + AC levitation method. Journal of Physics: Conference Series. 144 (2009) 012056 10.1088/1742-6596/144/1/012056 Open Access
2008
  1. H. Yasuda, Y. Yamamoto, N. Nakatsuka, T. Nagira, M. Yoshiya, A. Sugiyama, I. Ohnaka, K. Umetani, K. Uesugi. In situobservation of nucleation, fragmentation and microstructure evolution in Sn–Bi and Al–Cu alloys. International Journal of Cast Metals Research. 21 [1-4] (2008) 125-128 10.1179/136404608x361800
2007
  1. Hideyuki Yasuda, Tsutomu Yoshimoto, Takuya Mizuguchi, Yuki Tamura, Tomoya Nagira, Masato Yoshiya. Effect of the Melt Flow on the Solidified Structure of Middle Carbon Steel by Means of the Levitation Method Using Alternating and Static Magnetic Fields. ISIJ International. 47 [4] (2007) 612-618 10.2355/isijinternational.47.612 Open Access
  2. Tomoya Nagira, Hideyuki Yasuda, Takumi Sakimura, Asako Kawaguchi. Effects of Shaping Conditions on the Microstructure and the Mechanical Property of the Al2O3-YAG Eutectic Composite Produced by Melting the Al2O3-YAP Eutectic Structure. MATERIALS TRANSACTIONS. 48 [9] (2007) 2312-2315 10.2320/matertrans.mb200705
2006
  1. Mikio Ito, Tomoya Nagira, Shigeta Hara. Thermoelectric properties of NaxCo2O4 with rare-earth metals doping prepared by polymerized complex method. Journal of Alloys and Compounds. 408-412 (2006) 1217-1221 10.1016/j.jallcom.2004.12.110
2005
  1. Mikio Ito, Tomoya Nagira. Effect of the Polymerized Complex Process on Doping Limit of Thermoelectric NaxCo1−yMyO2 (M=Mn, Ni). MATERIALS TRANSACTIONS. 46 [7] (2005) 1456-1461 10.2320/matertrans.46.1456
  2. Hideyuki Yasuda, Yuki Tamura, Tomoya Nagira, Itsuo Ohnaka, Yoshihiko Yokoyama, Akihisa Inoue. Nucleation and Growth in Undercooled Melts of Bulk-Metallic-Glass Forming Zr60Ni25Al15 Alloy. MATERIALS TRANSACTIONS. 46 [12] (2005) 2762-2767 10.2320/matertrans.46.2762
2004
  1. Mikio Ito, Tomoya Nagira, Daisuke Furumoto, Yoshimitsu Oda, Shigeta Hara. Synthesis of NaxCo2O4thermoelectric oxide with crystallographic anisotropy by chemical solution process. Science and Technology of Advanced Materials. 5 [1-2] (2004) 125-131 10.1016/j.stam.2003.09.009 Open Access
2003
  1. Tomoya Nagira, Mikio Ito, Shigeru Katsuyama. Thermoelectric Properties of NaxCo2O4 Prepared by the Polymerized Complex Method and Hot-Pressing. MATERIALS TRANSACTIONS. 44 [1] (2003) 155-160 10.2320/matertrans.44.155
  2. Tomoya Nagira, Mikio Ito, Shigeru Katsuyama, Shigeta Hara. Thermoelectric Properties of NaxCo2O4 Prepared by the Polymerized Complex Method and Spark Plasma Sintering. MATERIALS TRANSACTIONS. 44 [9] (2003) 1866-1871 10.2320/matertrans.44.1866
  3. Tomoya Nagira, Mikio Ito, Shigeru Katsuyama, Kazuhiko Majima, Hiroshi Nagai. Thermoelectric properties of (Na1−yMy)xCo2O4 (M=K, Sr, Y, Nd, Sm and Yb; y=0.01∼0.35). Journal of Alloys and Compounds. 348 [1-2] (2003) 263-269 10.1016/s0925-8388(02)00799-5
2002
  1. Mikio Ito, Tomoya Nagira, Yoshimitsu Oda, Shigeru Katsuyama, Kazuhiko Majima, Hiroshi Nagai. Effect of Partial Substitution of 3d Transition Metals for Co on the Thermoelectric Properties of NaxCo2O4. MATERIALS TRANSACTIONS. 43 [3] (2002) 601-604 10.2320/matertrans.43.601
  2. Mikio Ito, Tomoya Nagira, Yoshitsugu Tsuchiya, Shigeru Katsuyama, Kazuhiko Majima, Hiroshi Nagai. Microstructure and Thermoelectric Properties of NaxCo2O4 Synthesized by Spark Plasma Sintering.. Journal of the Japan Society of Powder and Powder Metallurgy. 49 [5] (2002) 406-411 10.2497/jjspm.49.406 Open Access

書籍 TSV

2025
  1. 北野 萌一, 柳樂 知也. 高輝度放射光X線と機械学習技術による溶接凝固過程の詳細解析. AI、シミュレーションを用いた劣化・破壊評価と寿命予測. 株式会社技術情報協会, 2025, 9.

会議録 TSV

口頭発表 TSV

2026
  1. 柳樂 知也, 北野 萌一, 吉中 奎貴, 高森 晋, 澤口 孝宏, 小林 正樹, 山下享介, 青木祥宏, 藤井英俊. 放射光X線を利用したFe-Mn-Si系合金における レーザ溶接中の凝固現象のその場観察. 日本金属学会2026年春期第178回講演大会. 2026
2025
  1. 柳樂 知也, 北野 萌一, 吉中 奎貴, 高森 晋, 小林 正樹, 澤口 孝宏, 山下 享介, 青木 祥宏, 藤井 英俊. TIG溶接の低溶接速度下でのオーステナイト鋼の組織形成のその場観察. 溶接学会 2025年度秋季全国大会 (117回). 2025
  2. 山下　享介, 潮田浩作, 藤井英俊, 柳樂 知也, ゴンウー, 川崎卓郎, ハルヨステファヌス. 線形摩擦接合した厚鋼板の中性子回折による残留応力マッピング測定. 日本金属学会 2025年秋期第177回講演大会. 2025
  3. 井上泰彦, 本村達, 櫛部淳道, 梅村建次, 柳樂 知也, 吉中 奎貴. 新組成FMS合金を用いた溶接組立制振ブレースの性能評価 その１ 材料特性評価. 2025年度日本建築学会大会. 2025
  4. 本村達, 佐藤恭章, 井上泰彦, 櫛部淳道, 梅村建次, 柳樂 知也, 吉中 奎貴. 新組成FMS合金を用いた溶接組立制振ブレースの性能評価 その2 溶接組立部材を用いた低サイクル疲労試験. 2025年度日本建築学会大会. 2025
  5. 梅村建次, 井上泰彦, 渡井一樹, 佐藤恭章, 本村達, 櫛部淳道, 柳樂 知也, 吉中 奎貴. 新組成FMS 合金を用いた溶接組立制振ブレースの性能評価 その4 実大ブレースの地震波応答試験. 2025年度日本建築学会大会. 2025
  6. 佐藤恭章, 井上泰彦, 本村達, 櫛部淳道, 梅村建次, 柳樂 知也, 吉中 奎貴. 新組成FMS 合金を用いた溶接組立制振ブレースの性能評価 その3 実大ブレースの低サイクル疲労試験. 2025年度日本建築学会大会. 2025
  7. 柳樂 知也, 北野 萌一, 吉中 奎貴, 高森 晋, 澤口 孝宏, 山下享介, 青木祥宏, 藤井英俊. 放射光X線を利用したオーステナイト鋼の組織形成のその場観察. 第262回溶接冶金研究委員会. 2025
  8. 山下 享介, 虎本 陸希, 潮田 浩作, 藤井 英俊, 柳樂 知也, ゴンウー, 川崎卓郎, ハルヨステファヌス. 線形摩擦接合した鋼継手の水素脆化と残留応力. 第262回溶接冶金研究委員会. 2025
  9. 柳樂 知也, 北野 萌一, 吉中 奎貴, 小林 正樹, 高森 晋, 澤口 孝宏, 山下享介, 青木祥宏, 藤井英俊. X線イメージングを利用したFe-Mn-Si系合金の溶接凝固割れ感受性の評価. 溶接学会2025年度春季全国大会. 2025
  10. 山下享介, 潮田浩作, 藤井英俊, 柳樂 知也, 吉中 奎貴, 澤口 孝宏, ゴン　ウー, ハルヨ　ステファヌス, 川崎　卓郎. 摩擦攪拌接合したFe-Mn-Si系制振ダンパー合金接合部の相安定性. 溶接学会2025年度春季全国大会. 2025
  11. 山下享介, 潮田浩作, 藤井英俊, 柳樂 知也, 吉中 奎貴, 澤口 孝宏, ゴンウー, 川崎卓郎, ハルヨステファヌス. 引張変形中その場中性子回折法による 摩擦攪拌接合した制振ダンパー合金接合部の変形挙動解析. 日本金属学会2025年春期第176回講演大会. 2025
  12. 清水万真, 三浦拓也, 柳樂 知也, 大畑 充, 藤井英俊. 線形摩擦接合継手の破壊靭性とその意義の検討. 鉄鋼協会研究プロジェクト「摩擦接合技術の高度化と鋼材設計指針の提案」最終成果報告会～摩擦接合を含む革新的な固相接合技術～シンポジウム. 2025
  13. 柳樂 知也, 中村照美, 澤口 孝宏, 森正和, 森貞好昭, 藤井英俊. 制振ダンパー用Fe-Mn-Si系合金の摩擦攪拌接合技術の開発. 鉄鋼協会研究プロジェクト「摩擦接合技術の高度化と鋼材設計指針の提案」最終成果報告会～摩擦接合を含む革新的な固相接合技術～シンポジウム開催案内. 2025
2024
  1. YOSHINAKA, Fumiyoshi, SAWAGUCHI, Takahiro, TAKAMORI, Susumu, EMURA, Satoshi, NAGIRA, Tomoya, 井上泰彦. Deformation microstructure and fatigue property of new weldable bidirectional-TRIP steel. The 14th Asia-Pacific Conference on Fracture and Strength (APCFS 2024). 2024
  2. 高森 晋, 柳樂 知也, 吉中 奎貴, 檜原 高明, 上野 豪, 澤口 孝宏. Fe-Mn-Si系制振ダンパー金型鋳造材の組織と引張特性に及ぼすTiとCrの影響. 公益社団法人日本鋳造工学会 第184回全国講演大会. 2024
  3. 柳樂 知也, 北野 萌一, 小林 正樹, 吉中 奎貴, 澤口 孝宏, 山下享介, 青木祥宏, 藤井英俊. Fe-Mn-Si系合金のアーク溶接における凝固現象の解明. 溶接学会2024年度秋季全国大会. 2024
  4. 北野 萌一, 柳樂 知也. 高輝度放射光X 線その場観察による 溶接凝固部のひずみ場評価. 第258回溶接冶金研究委員会. 2024
  5. NAGIRA, Tomoya, SAWAGUCHI, Takahiro, 中村　照美, 森 正和, 森貞 好昭, 藤井 英俊. Friction stir welding of Fe-Mn-Si seismic damping alloy. 13th International Symposium on Friction Stir Welding. 2024
  6. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏. Fe-Mn-Si系合金における溶接技術の開発と溶接部の低サイクル疲労特性. 溶接学会2024年度春季全国大会. 2024
  7. 柳樂 知也. 放射光X線を利用した鋳造・溶接時の凝固現象の解明. 日本鉄鋼協会2024年春季(第187回)講演大会. 2024 招待講演
2023
  1. KITANO, Houichi, NAGIRA, Tomoya. Detailed Evaluation of In-situ Observations of Weld Solidification Behavior by Synchrotron Radiation X-rays Utilizing Data Scienc. MRM2023/IUMRS-ICA2023. 2023 招待講演
  2. 中山翔太, 清水万真, 庄司博人, 川久保拓海, 柳樂 知也, 藤井英俊, 大畑充. 耐候性鋼の線形摩擦接合継手の破壊靭性に及ぼす接合条件の影響. 溶接構造シンポジウム2023. 2023
  3. 北野 萌一, 柳樂 知也. 高輝度放射光 X 線イメージングと高速度カメラ観察を活用した溶接凝固部のその場観察. 第 21 回『溶接の研究』講習会. 2023 招待講演
  4. NAGIRA, Tomoya, YOSHINAKA, Fumiyoshi, 山下 享介, 青木 祥宏, 藤井 英俊. In situ observation of solidification behaviors of Fe-Mn-Si alloy during TIG welding. PRICM11. 2023 招待講演
  5. 高森 晋, 吉中 奎貴, 檜原 高明, 上野 豪, 柳樂 知也, 澤口 孝宏. Fe-Mn-Si系制振ダンパー金型鋳造材のCr量増加に伴う組織と材料特性の変化. 公益社団法人日本鋳造工学会　第182回全国講演大会. 2023
  6. 北野 萌一, 柳樂 知也. 放射光 X 線を用いたその場観察による 溶接凝固部の変位・ひずみ場の評価. 日本機械学会 M&M2023 材料力学カンファレンス. 2023
  7. 柳樂 知也, 中村照美, 澤口 孝宏, 森正和, 森貞好昭, 藤井英俊. 制振ダンパー用Fe-Mn-Si系合金の摩擦攪拌接合部の微細組織と機械的特性. 溶接学会2023年度秋季全国大会. 2023
  8. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏. Fe-Mn-Si系合金への溶接技術の適用と溶接部の疲労特性. 第254回溶接冶金研究委員会. 2023 招待講演
  9. 清水万真, 大畑充, 川久保拓海, NAGIRA, Tomoya, 藤井英俊. Fracture Toughness for Linear Friction Welded Joint of Weathering Steel. The 76th IIW Annual Assembly, Commission X. 2023
  10. 柳樂 知也. 放射光X線を利用した溶接凝固現象および凝固割れ形成挙動の解明. 大阪大学接合科学研究所　第20回産学連携シンポジウム. 2023 招待講演
  11. 高森 晋, 吉中 奎貴, 檜原 高明, 上野 豪, 柳樂 知也, 澤口 孝宏. Fe-Mn-Si系制振ダンパー材の凝固過程とミクロ偏析. 公益社団法人日本鋳造工学会 第181回全国講演大会. 2023
  12. 柳樂 知也, 中村 照美, 木村 隆, 吉中 奎貴, 澤口 孝宏, 青木　祥宏, 山下　享介, 藤井　英俊. X線イメージングを利用したオーステナイト鋼の溶接凝固現象の解明. 溶接学会2023年度春季全国大会. 2023
  13. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏, 青木　祥宏, 山下　享介, 藤井　英俊. 放射光X線を利用したFe-Mn-Si系合金のビード部における 溶接凝固現象のその場観察. 日本金属学会2023年春期第172回講演大会. 2023
2022
  1. NAGIRA, Tomoya, NAKAMURA, Terumi, 木村 隆, YOSHINAKA, Fumiyoshi, SAWAGUCHI, Takahiro, 山下享介, 青木 祥宏, 藤井　英俊. In situ observation of solidification mode of Fe-Mn-Si alloy during TIG spot welding using synchrotron X-ray. Visual-JW 2022 (The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation). 2022
  2. 川久保　拓海, 山下　享介, 潮田　浩作, 藤井　英俊, 柳樂 知也, 中村 照美, ゴンウー, 川崎卓郎, ハルヨステファヌス. 耐候性厚鋼板を用いた線形摩擦接合継手の残留応力. 日本鉄鋼協会第184回秋季講演大会　/　https://isij.or.jp/index.php. 2022
  3. 川久保拓海, 山下　享介, 潮田　浩作, 藤井英俊, 柳樂 知也, 中村 照美, ゴンウー, 川崎卓郎, ハルヨステファヌス. 耐候性厚鋼板を用いた線形摩擦接合継手の残留応力. 溶接学会 2022年度秋季全国大会 https://jweld.jp/tournament/national-convention-meeting/. 2022
  4. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏, 青木 祥宏, 山下　享介, 藤井　英俊. 放射光X線を利用したFe-Mn-Si系合金のビード部における溶接凝固現象の解明. 溶接学会 2022年度秋季全国大会（第111回） https://jweld.jp/tournament/. 2022
  5. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏, 青木祥宏, 山下享介, 藤井英俊. 放射光X線を利用したFe-Mn-Si系合金の溶接凝固現象の解明. 第249回溶接冶金研究委員会. 2022 招待講演
  6. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏, 青木 祥宏, 山下 享介, 藤井 英俊. 放射光X線を利用したFe-Mn-Si系合金の凝固モードの解析. 溶接学会 2022年度春季全国大会. 2022
  7. 川久保　拓海, 潮田　浩作, 藤井　英俊, 柳樂 知也, 中村 照美. 線形摩擦接合した耐候性鋼の微細組織と機械的特性に及ぼす接合温度の影響. 溶接学会 2022年度春季全国大会. 2022
  8. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏, 青木祥宏, 山下享介, 藤井英俊. 放射光X線を利用したFe-Mn-Si系合金の溶接凝固現象の解明. 日本金属学会 2022年春期第170回講演大会. 2022
  9. 柳樂 知也, Nikulin Ilya, 中村 照美, 澤口 孝宏, 森貞 好昭, 森 正和, 藤井 英俊. 制振ダンパー用Fe-Mn-Si系合金の摩擦攪拌接合. 日本鉄鋼協会2022年春季(第183回)講演大会シンポジウム／https://www.isij.or.jp/event/event2022/20220315-2.html. 2022
2021
  1. 柳樂 知也. 放射光X線を利用した凝固割れ発生・進展挙動のその場観察. 大阪大学接合科学研究所「東京セミナー」溶融加工プロセスでの凝固割れ発生現象とその防止. 2021 招待講演
  2. 川久保拓海, 潮田浩作, 藤井英俊, 柳樂 知也, 中村 照美. 耐候性厚鋼板の線形摩擦接合. 2021年度 溶接学会秋季全国大会. 2021
  3. 柳樂 知也, 中村 照美, 吉中 奎貴, 澤口 孝宏, 劉　恢弘, 青木祥宏, 釜井正善, 藤井英俊. 高空間分解X線イメージングを利用したFe-Mn-Si系合金における溶接凝固現象のその場観察. 2021年度 溶接学会秋季全国大会. 2021
  4. 初田　和大, 土谷　博昭, 川久保　拓海, 柳樂 知也, 藤井　英俊, 藤本　慎司. 摩擦攪拌接合を施した高リン炭素鋼に形成するさび層の耐食性. 日本鉄鋼協会第182回秋季講演大会/https://isij.or.jp/index.php. 2021
  5. 柳樂 知也, 山下大輔, 釜井正善, 劉恢弘, 青木祥宏, 藤井英俊. 放射光X線を利用したTIG溶接中の凝固割れ発生・進展挙動のその場観察. 第２４５回溶接冶金研究委員会. 2021 招待講演
  6. 柳樂 知也, ニクリン イリヤ, 中村 照美, 澤口 孝宏, 森貞　好昭, 藤井　英俊. 高Mn系制振ダンパー合金のFSWと組織形成機構. 溶接学会2021年度春季全国大会. 2021
  7. 安田秀幸, 西村友宏, 松林領汰, 森下浩平, 吉矢真人, 柳樂 知也. Fe-18%Cr-Ni(8, 11, 14, 20%Ni)合金における準安定δ相の核生成によるマッシブ的δ-γ変態の選択. 日本鉄鋼協会2021年第181回春季講演大会. 2021
  8. 柳樂 知也. 金属合金の凝固・変形のその場観察を利用した 溶接・鋳造欠陥、組織形成機構の解明. 日本金属学会2021年春季期第168回講演大会 https://confit.atlas.jp/guide/event/jim2021spring/top. 2021 招待講演
  9. 柳樂 知也, Xiaochao Liu, 潮田浩作, 藤井英俊. Micro-texture evolution of Ag with low stacking fault energy during friction stir welding. The 19th International Conference on Textures of Materials. 2021
2020
  1. 柳樂 知也, 劉　小超, 潮田　浩作, 藤井　英俊. 低い積層欠陥エネルギーを有するfcc金属におけるFSW中の微細組織形成機構の解明. 2020年度溶接学会秋季全国大会. 2020

その他の文献 TSV

2025
  1. NAGIRA, Tomoya, NAKAMURA, Terumi, SAWAGUCHI, Takahiro, 森正和, 森貞好昭, 藤井英俊. Tensile deformation behavior of friction stir welded joint of Fe-Mn-Si alloy. Proceedings of 13th International Symposium on Friction Stir Welding. 1 (2025) 1-7
2022
  1. 柳樂 知也. 放射光(SPring-8)を利用したアーク溶接における凝固欠陥形成機構の解明. 検査技術. (2022) 56-61

公開特許出願 TSV

  1. ＦＭＳ鋼用溶接ワイヤおよび溶接継手 (2024)

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