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Study on hydrogen-defect interaction in nuclear materials by using PAS and TDS

Research Project

Project/Area Number 17H03517
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

Toyama Takeshi  東北大学, 金属材料研究所, 准教授 (50510129)

Co-Investigator(Kenkyū-buntansha) 大澤 一人  九州大学, 応用力学研究所, 助教 (90253541)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Keywords陽電子消滅法 / 中性子照射 / 電子線照射 / 昇温脱離分析 / 水素捕獲 / 陽電子消滅 / 空孔型欠陥 / 照射欠陥 / 昇温脱離測定 / 原子力エネルギー / 水素 / 金属物性 / 格子欠陥
Outline of Final Research Achievements

Deuterium trapping at irradiation-induced defects in tungsten, a candidate material for plasma facing components in fusion reactors, was revealed by positron annihilation spectroscopy. Pure tungsten was electron-irradiated (8.5 MeV at ~373 K and to a dose of ~1 mdpa) or neutron-irradiated (at 573 K to a dose of ~0.3 dpa), followed by post-irradiation annealing at 573 K for 100 h in deuterium gas of ~0.1 MPa. In both cases of electron- or neutron-irradiation, vacancy clusters were found by positron lifetime measurements. In addition, positron annihilation with deuterium electrons was demonstrated by coincidence Doppler broadening measurements, directly indicating deuterium trapping at vacancytype defects.
This is expected to cause significant increase in deuterium retention in irradiated-tungsten.

Academic Significance and Societal Importance of the Research Achievements

水素脆化は広い学問分野にまたがる学際的な課題であり、これまでに多くの研究が行われてきた。本研究は、実験手法および理論計算の最近の進歩をもとに水素-空孔型欠陥の相互作用に焦点を当てるものであり、水素脆化研究において水素拡散・捕獲プロセスをより良く理解するための材料科学からの知見を与える。原子力材料の劣化機構解明につながるのみならず、材料科学的にも大きな意義がある研究である。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (18 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (2 results) Journal Article (9 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 9 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Int'l Joint Research] SCK/CEN(ベルギー)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] SCK/CEN(ベルギー)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Effects of neutron flux on irradiation-induced hardening and defects in RPV steels studied by positron annihilation spectroscopy2020

    • Author(s)
      T. Toyama, T. Yamamoto, N. Ebisawa, K. Inoue, Y. Nagai, G. R. Odette
    • Journal Title

      Journal of Nuclear Materials

      Volume: 532 Pages: 152041-152041

    • DOI

      10.1016/j.jnucmat.2020.152041

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Stable structure of hydrogen atoms trapped in tungsten divacancy2019

    • Author(s)
      K. Ohsawa, T. Toyama, Y. Hatano, M. Yamaguchi, H. Watanabe
    • Journal Title

      Journal of Nuclear Materials

      Volume: 527 Pages: 151825-151825

    • DOI

      10.1016/j.jnucmat.2019.151825

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Defect characterization, mechanical and thermal property evaluation in CVD-W after low-dose neutron irradiation2019

    • Author(s)
      Yi Xiaoou、Zhang Lei、Han Wentuo、Chen Jiao、Liu Pingping、Lv Yanwei、Song Jiupeng、Xue Luwei、Geng Diancheng、Yoshida Kenta、Toyama Takeshi、Zhan Qian、Wan Farong、Ohnuki Somei、Nagai Yasuyoshi
    • Journal Title

      International Journal of Refractory Metals and Hard Materials

      Volume: 85 Pages: 105004-105004

    • DOI

      10.1016/j.ijrmhm.2019.105004

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dynamics evaluation of hydrogen isotope behavior in tungsten simulating damage distribution2019

    • Author(s)
      Moeko Nakata, Keisuke Azuma, Akihiro Togari, Qilai Zhou, Mingzhong Zhao, Takeshi Toyama, Yuji Hatano, Naoaki Yoshida, Hideo Watanabe, Masashi Shimada, Dean Buchenauer, Yasuhisa Oya
    • Journal Title

      Fusion Engineering and Design

      Volume: 146 Pages: 2096-2096

    • DOI

      10.1016/j.fusengdes.2019.03.114

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 陽電子消滅法で調べたタングステン中の照射欠陥への重水素捕獲2019

    • Author(s)
      外山健 網恭平 佐藤紘一 Qiu, Xu 井上耕治 永井康介 波多野雄治
    • Journal Title

      陽電子科学

      Volume: 12 Pages: 23-29

    • NAID

      40021833091

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Contribution of irradiation-induced defects to hardening of a low-copper reactor pressure vessel steel2018

    • Author(s)
      Shimodaira Masaki、Toyama Takeshi、Yoshida Kenta、Inoue Koji、Ebisawa Naoki、Tomura Keiko、Yoshiie Toshimasa、Konstantinovic Milan J.、Gerard Robert、Nagai Yasuyoshi
    • Journal Title

      Acta Materialia

      Volume: 155 Pages: 402-409

    • DOI

      10.1016/j.actamat.2018.06.015

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of neutron irradiation on rhenium cluster formation in tungsten and tungsten-rhenium alloys2018

    • Author(s)
      Hwang Taehyun、Hasegawa Akira、Tomura Keiko、Ebisawa Naoki、Toyama Takeshi、Nagai Yasuyoshi、Fukuda Makoto、Miyazawa Takeshi、Tanaka Teruya、Nogami Shuhei
    • Journal Title

      Journal of Nuclear Materials

      Volume: 507 Pages: 78-86

    • DOI

      10.1016/j.jnucmat.2018.04.031

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Deuterium trapping at vacancy clusters in electron/neutron-irradiated tungsten studied by positron annihilation spectroscopy2018

    • Author(s)
      Toyama T.、Ami K.、Inoue K.、Nagai Y.、Sato K.、Xu Q.、Hatano Y.
    • Journal Title

      J. Nucl. Mater.

      Volume: 499 Pages: 464-470

    • DOI

      10.1016/j.jnucmat.2017.11.022

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The damage depth profile effect on hydrogen isotope retention behavior in heavy ion irradiated tungsten2017

    • Author(s)
      Fujita, Hiroe Uemura, Yuki Sakurada, Shodai Azuma, Keisuke Zhou, Qilai Toyama, Takeshi Yoshida, Naoaki Hatano, Yuji Chikada, Takumi Oya, Yasuhisa
    • Journal Title

      FUSION ENGINEERING AND DESIGN

      Volume: 125 Pages: 468-472

    • DOI

      10.1016/j.fusengdes.2017.05.141

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] 電子線照射W-X合金(X = Mo, Ta, Re)中の照射欠陥形成に対する添加元素効果2020

    • Author(s)
      外山健, 波多野雄治, Zhao Can, 井上耕治, 薮内敦, 木野村淳, 永井康介
    • Organizer
      日本金属学会2020年春期(第166回)講演大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 中性子照射タングステンの水素同位体吸収・放出の動力学2019

    • Author(s)
      外山 健 , 矢嶋 美幸 , 大野 哲靖 , 桒原 竜弥 , V. Kh Alimov , 波多野 雄治
    • Organizer
      第36回 プラズマ・核融合学会 年会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Deuterium trapping at irradiation-induced defects in tungsten stdied by positron annihilation spectroscopy2019

    • Author(s)
      T. Toyama, K. Ami, K. Inoue, Y. Nagai, K. Sato, Q. Xu, Y. Hatano
    • Organizer
      4th International Workshop on Models and Data for Plasma-Material Interaction in Fusion Devices
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Ultra-fine defects in a neutron-irradiated Reactor Pressure Vessel steel studied by positron annihilation spectroscopy2018

    • Author(s)
      T. Toyama, M. Shimodaira, K. Yoshida, K. Inoue, Y. Nagai, M. J. Konstantinovic, R. Gerard
    • Organizer
      ICPA-18
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 陽電子消滅法で調べた原子炉圧力容器鋼監視試験片中で照射初期に形成する微小欠陥2018

    • Author(s)
      外山 健、吉田 健太、下平 昌樹、 井上 耕治、永井 康介、Milan Konstantinovic、Robert Gerard
    • Organizer
      日本金属学会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 陽電子消滅法で調べた照射初期に形成する微小欠陥2018

    • Author(s)
      外山 健、吉田 健太、下平 昌樹、 井上 耕治、永井 康介、Milan Konstantinovic、Robert Gerard
    • Organizer
      日本アイソトープ協会研究発表会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Deuterium trapping at vacancy clusters in neutron-irradiated tungsten studied by positron annihilation spectroscopy2017

    • Author(s)
      T. Toyama, K. Inoue, Y. Nagai, K. Ami, Y. Hatano
    • Organizer
      Positron Study on Defects
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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