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Improvement in radiation resistance in refractory transition metals such as tungsten by radiation induced ductilization

Research Project

Project/Area Number 13308022
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionTohoku University

Principal Investigator

KURISHITA Hiroaki  Tohoku University, IMR, International research center for nuclear materials science, Associate Professor, 金属材料研究所, 助教授 (50112298)

Co-Investigator(Kenkyū-buntansha) HATAKAYAMA Masahiko  Tohoku University, IMR, International research center for nuclear materials science, Research associate, 金属材料研究所, 助手 (30375109)
HIRAOKA Yutaka  Okayama University of Science, Department of applied physics, Professor, 理学部, 教授 (70228774)
TAKIDA Tomohiro  Allied Material Corp., Electronic materials dept., Assistant Manager, 主査
湯蓋 邦雄 (湯蓋 邦夫)  東北大学, 金属材料研究所, 助手 (00302208)
Project Period (FY) 2001 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥53,040,000 (Direct Cost: ¥40,800,000、Indirect Cost: ¥12,240,000)
Fiscal Year 2004: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2003: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2002: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2001: ¥28,210,000 (Direct Cost: ¥21,700,000、Indirect Cost: ¥6,510,000)
Keywordsradiation-induced precipitation / radiation-induced martensitic transformation / ultra-fine grain / dispersoids / high energetic perticle irradiation / radiation damage / radiation embrittlement / radiation hardening / 結晶粒 / メカニカルアロイング / 中性子照射 / 室温延性 / 組織制御 / シンク密度 / 機械的性質 / 再結晶温度 / タングステン / 微細結晶粒・粒子分散 / Mo_2C / WC / 析出 / 燒結 / 脆化
Research Abstract

Methodologies for significant improvement in resistance to radiation embrittlement in refractory transition metals such as tungsten involve the applications of radiation-induced intergranular precipitation, radiation-induced martensitic transformation and introduction of a very high density of sinks for irradiation induced point defects. Therefore, pre-irradiation microstructural states and irradiation conditions for each of the three aspects to effectively occur have been examined. It is shown that radiation-induced intergranular precipitation can occur in microstructures comprising fine grains and fine grain-boundary dispersoids with a lower dislocation density under a temperature-cycle irradiation condition. Radiation-induced martensitic transformation can occur in microstructures of fine grains with a high purity matrix under irradiation at lower irradiation temperatures with higher doses. The introduction of a very high density of sinks can include the above two aspects of the microstructural conditions providing that the purity is high in the fine grains with a lower dislocation density, and can provide beneficial effects over wide irradiation conditions. This situation was, however, quite difficult especially for tungsten with maintaining other properties including sufficient relative density and toughness before irradiation. In this study, the desired microstructure has been successfully introduced for W-(0.3-0.7)%TiC by advanced powder metallurgical methods : e.g., the grain size is as low as 50-100nm with the relative density of approximately 99% and the fracture strength of 2GPa. It has been demonstrated so far that W-(0.3-0.7)%TiC exhibits very high resistance to irradiation by fast neutrons and high energy ions such as He and N_2. The results show that the material is very promising for the use as divertors and structural materials exposed to irradiation environments.

Report

(5 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (28 results)

All 2005 2004 2003 2002 Other

All Journal Article (24 results) Publications (4 results)

  • [Journal Article] Radiation Embrittlement Behavior of Fine-Grained Molybdenum Alloys with 0.2wt%TiC Addition2005

    • Author(s)
      Y.Kitsunai
    • Journal Title

      J. Nucl. Mater. 346

      Pages: 233-243

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Microstructure Control to Improve the Resistance to Radiation Embrittlement in Vanadium2005

    • Author(s)
      H.Kurishita
    • Journal Title

      J. Nucl. Mater. 343

      Pages: 318-324

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Microstructure and Bend Ductility of W-0.3mass%TiC Alloys Fabricated by Advanced Powder-Metallurgical Processing2005

    • Author(s)
      Y.Ishijima
    • Journal Title

      Mater. Trans. 46

      Pages: 568-574

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Radiation Embrittlement Behavior of Fine-Grained Molybdenum Alloys with 0.2wt%TiC Addition2005

    • Author(s)
      Y.Kitsunai
    • Journal Title

      J.Nucl.Mater. 346

      Pages: 233-243

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Microstructure Control to Improve the Resistance to Radiation Embrittlement In Vanadium2005

    • Author(s)
      H.Kurishita
    • Journal Title

      J.Nucl.Mater. 343

      Pages: 318-324

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Microstructure and Bend Ductility of W-0.3mass%TiC Alloys Fabricated by Advanced Powder-Metallurgical Processing2005

    • Author(s)
      Y.Ishijima
    • Journal Title

      Mater.Trans. 46

      Pages: 568-574

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Microstructure and Bend Ductility of W-0.3mass%TiC Alloys Fabricated Advanced Powder-Metallurgical Processing2005

    • Author(s)
      Y.Ishijima
    • Journal Title

      Mater.Trans. 46.3

      Pages: 568-574

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Current Status of Ductile Tungsten Alloy Development by Mechanical Alloying2004

    • Author(s)
      Y.Ishijima
    • Journal Title

      J. Nucl. Mater. 329-333

      Pages: 775-779

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying2004

    • Author(s)
      T.Takida
    • Journal Title

      Mater. Trans. 45

      Pages: 143-148

    • NAID

      10011981897

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Neutron Iirradiation on the Microstructure and Hardness in Particle Dispersed Ultra-Fine Grained V-Y Alloys2004

    • Author(s)
      S.Kobayashi
    • Journal Title

      Mater. Trans. 45

      Pages: 29-33

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of Fast Neutron Irradiation on Microstructures in Particle Dispersed Ultra-Fne Grained V-Y Alloys2004

    • Author(s)
      S.Kobayashi.
    • Journal Title

      J. Nucl. Mater. 329-333

      Pages: 447-451

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Current Status of Ductile Tungsten Alloy Development by Mechanical Alloying2004

    • Author(s)
      Y.Ishijima
    • Journal Title

      J.Nucl.Mater. 329-333

      Pages: 775-779

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying2004

    • Author(s)
      T.Takida
    • Journal Title

      Mater.Trans. 45

      Pages: 143-148

    • NAID

      10011981897

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of Neutron Iirradiation on the Microstructure and Hardness in Particle Dispersed Ultra-Fine Grained V-Y Alloys2004

    • Author(s)
      S.Kobayashi
    • Journal Title

      Mater.Trans. 45

      Pages: 29-33

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of Fast Neutron Irradiation on Microstructures in Particle Dispersed Ultra-Fne Grained V-Y Alloys2004

    • Author(s)
      S.Kobayashi
    • Journal Title

      J.Nucl.Mater. 329-333

      Pages: 447-451

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying2004

    • Author(s)
      T.Takida
    • Journal Title

      Mater.Trans. 45.1

      Pages: 138-145

    • NAID

      10011981897

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Development of High-Toughness W-Alloy by Mechanical Alloying2003

    • Author(s)
      H.Kurishita
    • Journal Title

      Proc. 4th Workshop on the Materials Science and Technology for Spallation Neutron Source

      Pages: 62-67

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Strength Proof Evaluation of Diffusion-Jointed W/Ta Interface by Small Punch Test2003

    • Author(s)
      J-F.Li
    • Journal Title

      J. Nucl. Mater. 321

      Pages: 129-134

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] R&D of a MW-Class Solid-Target for a Spallation Neutron Source2003

    • Author(s)
      M.Kawai
    • Journal Title

      J. Nucl. Mater. 318

      Pages: 38-55

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Strength Proof Evaluation of Diffusion-Jointed W/Ta Interface by Small Punch Test2003

    • Author(s)
      J-F.Li
    • Journal Title

      J.Nucl.Mater. 321

      Pages: 129-134

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] R&D of a MW-Class Solid-Target for a Spallation Neutron Source2003

    • Author(s)
      M.Kawai
    • Journal Title

      J.Nucl.Mater. 318

      Pages: 38-55

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Improvement in Ductility of Refractory Metals by Neutron Irradiation2002

    • Author(s)
      H.Kurishita
    • Journal Title

      Basic Studies in the Field of High-Temperature Engineering

      Pages: 103-112

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Improvement in Ductility of Refractory Metals by Neutron Irradiation2002

    • Author(s)
      H.Kurishita
    • Journal Title

      Basic Studies in the Field of High-Temperature Engineering, OECD

      Pages: 103-112

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Development of High-Toughness W-Alloy by Mechanical Alloying

    • Author(s)
      H.Kurishita
    • Journal Title

      Proc.4th WS on the Materials Science and Technology for Spallation Neutron Source May 2003

      Pages: 62-67

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Y.Ishijima, H.Kurishita, K.Yubuta, H.Arakawa, M.Hasegawa, Y.Hiraoka, T.Takida: "Current Status of Ductile Tungsten Alloy Development by Mechanical Alloying"J.Nucl.Mater.. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Takida, H.Kurishita, M.Mabuchi, T.Igarashi, Y.Doi, T.Nagae: "Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying"Mater.Trans.. 45・1. 138-145 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] J-F.Li, M.Kawai, K.Kikuchi, T.Igarashi, H.Kurishita, R.Watanabe, A.Kawasaki: "Strength Proof Evaluation of Diffusion-joined W/Ta Interface by Small Punch Test"J.Nucl.Mater.. 321. 129-134 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Kawai, M.Furusaka, K.Kikuchi, H.Kurishita, R.Watanabe, J-F.Li, et al.: "R&D of A MW-Class Solid-Target for s Spallation Neutron Source"J.Nucl.Mater.. 318. 38-55 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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