研究者業績

永瀬 丈嗣

ナガセ タケシ  (Takeshi Nagase)

基本情報

所属
兵庫県立大学 大学院 工学研究科 教授
大阪大学 大学院工学研究科 招聘教授
(兼任)超高圧電子顕微鏡センター 招聘教授
学位
博士(工学)(2003年3月 大阪大学)
Doctor(Enginnering)(Osaka University)

研究者番号
50362661
ORCID ID
 https://orcid.org/0000-0003-4868-0773
J-GLOBAL ID
200901088129356130
Researcher ID
M-1189-2015
researchmap会員ID
1000317435

外部リンク

委員歴

 7

受賞

 26

論文

 300
  • Hiroyuki Y. Yasuda, Yusuke Yamada, Masato Onishi, Hiroki Suzuki, Ken Cho, Satoshi Ichikawa, Takeshi Nagase
    Scripta Materialia 255 116401-116401 2025年1月  査読有り最終著者
  • 永瀬丈嗣
    日本金属学会会報・まてりあ 63(12) 890-890 2024年12月  査読有り筆頭著者責任著者
  • 宇野宏司, 西村宗真, 永瀬丈嗣, 柏井茂雄, 柿木哲哉
    土木学会論文集 80(17) 24-17275-n/a 2024年11月  査読有り
  • 永瀬丈嗣, 今木辰彦, 竹内章, 柳谷彰彦, 山口篤, 山﨑徹
    溶接学会誌 93(7) 418-422 2024年10月  査読有り筆頭著者責任著者
  • Takeshi Nagase, Mitsuharu Todai, Satoshi Ichikawa, Aira Matsugaki, Takayoshi Nakano
    MATERIALS TRANSACTIONS 64(9) 1041-1048 2024年9月1日  査読有り筆頭著者責任著者
  • 永瀬丈嗣
    日本原子力学会誌・アトモス 66(8) 400-404 2024年8月  査読有り招待有り筆頭著者責任著者
  • Tadaaki Matsuzaka, Akira Hyakubu, Yong Seong Kim, Aira Matsugaki, Takeshi Nagase, Takuya Ishimoto, Ryosuke Ozasa, Hyoung Seop Kim, Tomoji Mizuguchi, Ozkan Gokcekaya, Takayoshi Nakano
    Materials Chemistry and Physics 129120-129120 2024年2月  査読有り
  • 永瀬丈嗣, 當代光陽, 中野貴由
    チタン 72(1) 30-37 2024年1月  招待有り筆頭著者
  • Hiroyuki Y. Yasuda, Masaki Horiguchi, Ken Cho, Takahiro Masuda, Takeshi Nagase
    Solid State Phenomena 353 25-30 2023年12月5日  査読有り最終著者
  • 永瀬丈嗣, 柴田顕弘, 松室光昭, 武村守, 千星聡
    日本銅学会誌・銅と銅合金 62(1) 60-67 2023年8月  査読有り筆頭著者責任著者
  • Takeshi Nagase, Tomoyuki Terai, Mitsuaki Matsumuro, Mamoru Takemura
    MATERIALS TRANSACTIONS 64(8) 1982-1990 2023年8月1日  査読有り筆頭著者責任著者
  • Takeshi Nagase
    MATERIALS TRANSACTIONS 64(7) 1655-1662 2023年7月1日  査読有り筆頭著者責任著者
  • Takeshi Nagase, Takuya Tamura
    MATERIALS TRANSACTIONS 64(7) 1645-1654 2023年7月1日  査読有り筆頭著者責任著者
  • Akira Takeuchi, Takeshi Wada, Kenji Amiya, Hidemi Kato, Takeshi Nagase
    MATERIALS TRANSACTIONS 64(4) 841-848 2023年4月1日  査読有り最終著者
  • 永瀬丈嗣, 西竜治, 市川聡
    材料 72(3) 226-227 2023年3月15日  査読有り筆頭著者責任著者
  • 永瀬丈嗣
    72(3) 197-197 2023年3月15日  査読有り筆頭著者責任著者
  • 永瀬丈嗣
    鋳造工学 94 542-551 2022年9月  査読有り招待有り筆頭著者責任著者
  • 淺野和典, 永瀬丈嗣, 柏井茂雄, 兼吉高宏, 北村一浩
    日本金属学会会報・まてりあ 61(8) 493-498 2022年8月1日  査読有り招待有り
  • 柏井茂雄, 兼吉高宏, 永瀬丈嗣, 淺野和典, 北村一浩
    日本金属学会会報・まてりあ 61(7) 437-442 2022年7月1日  査読有り招待有り責任著者
  • 永瀬丈嗣, 柏井茂雄, 兼吉高宏, 淺野和典, 北村一浩
    日本金属学会会報・まてりあ 61(6) 340-345 2022年6月  査読有り招待有り筆頭著者責任著者
  • 永瀬丈嗣, 寺井智之, 松室光昭, 武村守
    粉体および粉末冶金 69(5) 185-194 2022年5月  査読有り筆頭著者責任著者
  • 永瀬丈嗣
    日本金属学会会報・まてりあ 61(3) 168-169 2022年3月  査読有り招待有り筆頭著者責任著者
  • 小笹良輔, 松垣あいら, 當代光陽, 石本卓也, 永瀬丈嗣, 中野貴由
    チタン 70(1) 44-52 2022年2月  査読有り
  • Takeshi Nagase, Mitsuharu Todai, Pan Wang, Shi-Hai Sun, Takayoshi Nakano
    Materials Chemistry and Physics 276 125409-125409 2022年1月  査読有り筆頭著者
    The design and development of TiZrHfAl medium entropy alloy (MEA), and the TiZrHfAlNb0.2 and TiZrHfAlV0.2 high entropy alloys (HEAs) is described. The combination of 4th subgroup elements (Ti, Zr, and Hf) with Al is discussed based on the periodic table and taxonomy of HEAs. The alloys were designed using alloy parameters for HEAs, predicted ground state diagrams from the Materials Project, and the calculation of phase diagrams (CALPHAD). Rapid solidification was effective to suppress the formation of intermetallic compounds, resulting in BCC/B2 phase formation. Significant differences in the constituent phases and Vickers hardness between ingots and melt-spun ribbons were found among the TiZrHfAl MEA, TiZrHfAlNb0.2, and TiZrHfAlV0.2 HEAs.
  • 永瀬丈嗣, 田村卓也
    日本銅学会誌・銅と銅合金 60(1) 167-175 2021年8月  査読有り筆頭著者責任著者
  • Takeshi Nagase, Akihiro Shibata, Mitsuaki Matsumuro, Mamoru Takemura, Satoshi Semboshi
    MATERIALS TRANSACTIONS 62(6) 856-863 2021年6月1日  査読有り筆頭著者責任著者
    The ingots of CuxZnMnNi (x = 1,2) medium-entropy (ME) brasses were fabricated using metallic mold-casting process without a vacuum chamber. The molten metal was obtained by high-frequency melting of the mixture of pure Cu, pure Ni, and pre-alloy ingots of Mn-Cu and Zn-Ni using silica-based crucible in Ar flow. The metallic mold-casting ingots were obtained using centrifugal casting in air atmosphere. The composite of body-centered-cubic (BCC) and face-centered-cubic (FCC) phases were obtained in the ingots of equiatomic CuZnMnNi ME brass, while a near-single FCC phase was obtained in the ingots of non-equiatomic Cu2ZnMnNi ME brass, where the identification of the constituent phases was mainly performed by XRD analysis. The ingots showed superior deformability and high 0.2% proof stress during compression test conducted at room temperature.
  • Takuya Ishimoto, Ryosuke Ozasa, Kana Nakano, Markus Weinmann, Christoph Schnitter, Melanie Stenzel, Aira Matsugaki, Takeshi Nagase, Tadaaki Matsuzaka, Mitsuharu Todai, Hyoung Seop Kim, Takayoshi Nakano
    Scripta Materialia 194 113658-113658 2021年3月  査読有り
    BioHEAs, specifically designed high entropy alloy (HEA) systems for biomedical applications, represent a new era for biometals. However, recent challenges are (1) the poor shape customizability, and (2) the inevitable severe segregation due to the intrinsic fact that HEA is an ultra-multicomponent alloy system. To achieve shape customization and suppression of elemental segregation simultaneously, we used an extremely high cooling rate (~10 K/s) of the selective laser melting (SLM) process. We, for the first time, developed pre-alloyed Ti Nb Ta Zr Mo BioHEA powders and SLM-built parts with low porosity, customizable shape, excellent yield stress, and good biocompatibility. The SLM-built specimens showed drastically suppressed elemental segregation compared to the cast counterpart, representing realization of a super-solid solution. As a result, the 0.2% proof stress reached 1690 ± 78 MPa, which is significantly higher than that of cast Ti Nb Ta Zr Mo (1140 MPa). The SLM-built Ti Nb Ta Zr Mo BioHEA is promising as a next-generation metallic material for biomedical applications. 7 1.4 0.6 0.6 1.4 0.6 1.4 0.6 0.6 1.4 0.6 1.4 0.6 0.6 1.4 0.6
  • Hiroyuki Y. Yasuda, Yusuke Yamada, Ken Cho, Takeshi Nagase
    Materials Science and Engineering: A 809 140983-140983 2021年2月  査読有り
    Deformation behavior of equiatomic HfNbTaTiZr high entropy alloy single crystals and polycrystals were investigated. The single crystalline specimens could be obtained from the coarse-grained polycrystals annealed just below the melting point. 1/2<111> screw dislocations played an important role in the deformation behavior, similar to body centered cubic (bcc) metals. Moreover, a yield stress anomaly was found to appear in the alloys solutionized at 1473 K. The yield stress decreased rapidly with increasing temperature up to 673 K, while the stress increased at 873 K. Further increase in temperature resulted in a decrease in yield stress. It is also noted that the microstructure of the alloys depended strongly on annealing temperature. At 773–1073 K, phase separation into two bcc phase took place, while the hexagonal close-packed (hcp) phase was precipitated at 773–973 K. The ω phase which is typical in β-titanium alloys was also observed at 673 K. The strain-rate sensitivity of the deformation behavior and micro-Vickers hardness after the heat treatment suggest that the dynamic precipitation of the hcp phase is responsible for the yield stress anomaly.
  • Yuuka Iijima, Takeshi Nagase, Aira Matsugaki, Pan Wang, Kei Ameyama, Takayoshi Nakano
    Materials & Design 202 109548-109548 2021年2月  査読有り
    Applying empirical alloy parameters (including Mo equivalent), the predicted ground state diagram, and thermodynamic calculations, noble nonequiatomic Ti–Zr–Hf–Nb–Ta–Mo high-entropy alloys for metallic biomaterials (BioHEAs) were designed and newly developed. It is found that the Moeq and valence electron concentration (VEC) parameters are useful for alloy design involving BCC structure formation in bio medium-entropy alloys and BioHEAs. Finally, we find a Ti Zr Hf Nb Ta Mo (at.%) BioHEA that exhibits biocompatibility comparable to that of CP–Ti, higher mechanical strength than CP–Ti, and an appreciable room-temperature tensile ductility. The current findings pave the way for new Ti–Zr–Hf–Nb–Ta–Mo BioHEAs development and are applicable for another BioHEA alloys system. 28.33 28.33 28.33 6.74 6.74 1.55
  • Mitsuharu Todai, Takeshi Nagase, Takayoshi Nakano
    Materials Science Forum 1016 1797-1801 2021年1月  査読有り
    In this study, we sucsess the fabrication of dense compornent of Ti-20at.%X (X = Cr and Nb) alloys by Selected laser melting (SLM) pwocess, from a mixture of poweder element powders. The volume rasio of pore and non-molten particles is dependent of the enegy density. The difficulty of fabrication of Ti-X alloy comporment is dependent of melting temperature of X element. Thus, Ti-20at.%Cr alloys, which has the lowest melting temperature of X is easier to monufacture of dense comporment. The Ti-20at.%Cr alloys and Ti-20at.%Nb comprise β-Ti single-phase components without any non-molten particles and macroscopic defects. In addtion, the {001}〈100〉 crystallographic texture of these Ti-Cr and Ti-Nb alloys can be controlled effectively by optimizing the SLM parameters. This means that the SLM is key techmelogy of controlling of Young’s modulus and shape at the same time because Young's modulus of be-ta phase in Ti alloys is strongly related to the crystal orientation.
  • Hiroyuki Y. Yasuda, Hiroyuki Miyamoto, Takuya Inagaki, Ken Cho, Takeshi Nagase
    Materials Science Forum 1016 1690-1695 2021年1月  査読有り
    In AlxCoCrFeNi high entropy alloys (x = 0.3–0.5), the NiAl phase with the B2 structure is precipitated rapidly along the fcc grain boundaries. During recrystallization after conventional cold rolling, the NiAl precipitates effectively suppress the grain growth, which results in the ultrafine-grained microstructure. It should be noted that no severe plastic deformation is necessary to obtain the microstructure. The volume fraction of the NiAl precipitates increases with increasing x. As a result, the average grain size of the fcc matrix (<italic>d</italic>m) after the recrystallization decreases with increasing x, and therefore, a minimum <italic>d</italic>m of 0.5 μm can be obtained at x = 0.5. The grain refinement by the NiAl precipitates is consistent with the Zener-Smith model. At x = 0.5, the alloy with <italic>d</italic>m = 0.5 μm exhibits a yield stress of 1163 MPa and an elongation of 24% at room temperature.
  • Takeshi Nagase
    Materials Science Forum 1016 990-996 2021年1月  査読有り筆頭著者責任著者
    Fast electron irradiation can induce the solid-state amorphization (SSA) of many intermetallic compounds. The occurrence of SSA stimulated by fast electron irradiation was found in the Al0.5TiZrPdCuNi high-entropy alloy (HEA). The relationship between the occurrence of SSA in intermetallic compounds under fast electron irradiation and the empirical alloy parameters for predicting the solid-solution-formation tendency in HEAs was discussed. The occurrence of SSA in intermetallic compounds was hardly predicted, only by the alloy parameters of <italic>δ</italic> or Δ<italic>H</italic>mix, which have been widely used for predicting solid-solution formation in HEAs. All intermetallic compounds with Δ<italic>H</italic>mix ≤ -35 kJ/mol and those with <italic>δ</italic> ≥ 12.5 exhibit the occurrence of SSA. This implies that the intermetallic compounds with a largely negative Δ<italic>H</italic>mix value and a largely positive <italic>δ</italic> parameter are favorable for the occurrence of SSA.
  • Takeshi Nagase
    Materials 13(22) 5268-5268 2020年11月21日  査読有り筆頭著者責任著者
    The Ti–Ag alloy system is an important constituent of dental casting materials and metallic biomaterials with antibacterial functions. The binary Ti–Ag alloy system is characterized by flat liquidus lines with metastable liquid miscibility gaps in the phase diagram. The ternary Ti–Ag-based alloys with liquid phase separation (LPS) were designed based on the mixing enthalpy parameters, thermodynamic calculations using FactSage and Scientific Group Thermodata Europe (SGTE) database, and the predicted ground state diagrams constructed by the Materials Project. The LPS behavior in the ternary Ti–Ag–Nb alloy was investigated using the solidification microstructure analysis in arc-melted ingots and rapidly solidified melt-spun ribbons via trans-scale observations, combined with optical microscopy (OM), scanning electron microscopy (SEM) including electron probe micro analysis (EPMA), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM). The solidification microstructures depended on the solidification processing in ternary Ti–Ag–Nb alloys; macroscopic phase-separated structures were observed in the arc-melted ingots, whereas fine Ag globules embedded in the Ti-based matrix were observed in the melt-spun ribbons.
  • Takeshi Nagase, Tomoyuki Terai, Mitsuaki Matsumuro, Mamoru Takemura
    ISIJ International 60(11) 2615-2624 2020年11月15日  査読有り筆頭著者責任著者
  • Takeshi Nagase, Toru Maruyama, Kazunori Asano, Yoshio Igarashi
    MATERIALS TRANSACTIONS 61(9) 1853-1861 2020年9月1日  査読有り筆頭著者責任著者
  • T. Nagase, M. Todai, T. Nakano
    Scripta Materialia 186 242-246 2020年9月  査読有り筆頭著者
  • 永瀬丈嗣, 柴田顕弘, 松室光昭, 武村守, 千星聡
    日本銅学会誌・銅と銅合金 59(1) 24-31 2020年8月  査読有り筆頭著者責任著者
  • Takeshi Nagase
    MATERIALS TRANSACTIONS 61(7) 1369-1380 2020年7月1日  査読有り筆頭著者責任著者
  • Takeshi Nagase, Mitsuharu Todai, Takayoshi Nakano
    Crystals 10(6) 527-527 2020年6月20日  査読有り筆頭著者
    The liquid phase separation (LPS) behavior in Co-Cr-based high-entropy alloys (HEAs) is an important target for the development of Co-Cr-based HEAs for metallic biomaterials (BioHEAs). The solidification microstructure in Ag-Co-Cr-Fe-Mn-Ni-Ag, Co-Cr-Cu-Fe-Mn-Ni-Cu, and Co-Cr-Cu-Fe-Mn-Ni-B HEAs, which were designed as the combination of the equiatomic CoCrFeMnNi with Ag, Cu, and the interstitial element of B, was investigated as the fundamental research of LPS in Co-Cr-based HEAs. Ingots of equiatomic AgCoCrFeMnNi, equiatomic CoCrCuFeMnNi, non-equiatomic CoCrCuxFeMnNi (x = 2, 3), and CoCrCuxFeMnNiB0.2 (x = 1, 2, 3) with a small amount of B were fabricated using the arc-melting process. A macroscopic phase-separated structure was observed in the ingots of the equiatomic AgCoCrFeMnNi and CoCrCuxFeMnNiB0.2 (x = 2, 3) HEAs. The addition of a small amount of B enhanced the LPS tendency in the Co-Cr-Fe-Mn-Ni-Cu HEAs. The LPS behavior was discussed through the heat of mixing and computer coupling of phase diagrams and thermochemistry (CALPHAD).
  • 永瀬丈嗣, 丸山徹
    日本鉄鋼協会会報・ふぇらむ 25(4) 218-227 2020年4月  査読有り招待有り筆頭著者
  • Takeshi Nagase, Yuuka Iijima, Aira Matsugaki, Kei Ameyama, Takayoshi Nakano
    Materials Science and Engineering C 107 2020年2月  査読有り
    © 2019 The Authors Novel TiZrHfCr0.2Mo and TiZrHfCo0.07Cr0.07Mo high-entropy alloys for metallic biomaterials (bio-HEAs) were developed based on the combination of Ti–Nb–Ta–Zr–Mo alloy system and Co–Cr–Mo alloy system as commercially-used metallic biomaterials. Ti–Zr-Hf-Cr-Mo and Ti–Zr-Hf-Co-Cr-Mo bio-HEAs were designed using (a) a tree-like diagram for alloy development, (b) empirical alloy parameters for solid-solution-phase formation, and (c) thermodynamic calculations focused on solidification. The newly-developed bio-HEAs overcomes the limitation of classical metallic biomaterials by the improvement of (i) mechanical hardness and (ii) biocompatibility all together. The TiZrHfCr0.2Mo and TiZrHfCo0.07Cr0.07Mo bio-HEAs showed superior biocompatibility comparable to that of commercial-purity Ti. The superior biocompatibility, high mechanical hardness and low liquidus temperature for the material processing in TiZrHfCr0.2Mo and TiZrHfCo0.07Cr0.07Mo bio-HEAs compared with the Ti–Nb–Ta–Zr–Mo bio-HEAs gave the authenticity of the application of bio-HEAs for orthopedic implants with multiple functions.
  • 當代光陽, 永瀬丈嗣, 中野貴由
    チタン 68(1) 59-63 2020年2月  査読有り招待有り
  • 當代光陽, 永瀬丈嗣, 中野貴由
    軽金属 70(1) 14-23 2020年2月  査読有り招待有り
  • T. Nagase, T. Terai, T. Kakeshita, K. Morita
    Materials Transactions 61(2) 311-317 2020年2月  査読有り筆頭著者責任著者
  • Takeshi Nagase, Mitsuharu Todai, Takayoshi Nakano
    Materials Transactions 61(4) 567-576 2020年  査読有り
    © 2020 The Japan Institute of Metals and Materials. CoCr and CoCrMo-based alloys are commercially used in the industry especially for high wear resistance and superior chemical and corrosion performance in hostile environments. These alloys were widely recognized as the important metallic biomaterials. Here, the first development of CoCrMoFeMnW and CoCrMoFeMnWAg high-entropy alloys (HEAs) based on CoCrMo metallic biomaterials is reported. Ingots of six-component Co2.6Cr1.2Mo0.2FeMnW0.27 (Co41.5Cr19.1Mo3.2Fe16Mn16W4.3, at%) HEAs with a minor · phase and of seven-component Co4.225Cr1.95Mo0.2FeMnW0.2Ag0.5 (Co46.6Cr21.5Mo2.2Fe11Mn11W2.2Ag5.5, at%) and Co2.6Cr1.2Mo0.1FeMnW0.1Ag0.18 (Co42.1Cr19.4Mo1.6Fe16.2Mn16.2W1.6Ag2.9, at%) HEAs without an · phase were fabricated. The alloy was designed by a taxonomy of HEAs based on the periodic table, a treelike diagram, predicted phase diagrams constructed by Materials Project, and empirical alloy parameters for HEAs. The · phase formation prevented the formation of solid solutions in CoCrMo-based HEAs without a Ni element. The · phase formation in as-cast ingots was discussed based on the composition dependence and valence electron concentration theory.
  • Takeshi Nagase, Tomoyuki Kakeshita, Kotaro Matsumura, Koichiro Nakazawa, Satoshi Furuya, Nobuaki Ozoe, Katsumi Yoshino
    Materials & Design 184 108172-108172 2019年12月  査読有り
  • 永瀬丈嗣, 寺山朗, 長岡孝, 府山伸行, 阪本辰顕
    鋳造工学 2019年10月  査読有り
  • 永瀬丈嗣
    金属 2019年10月  査読有り

MISC

 19

書籍等出版物

 4

講演・口頭発表等

 436

共同研究・競争的資金等の研究課題

 35