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1990 Fiscal Year Final Research Report Summary

High Resolution Electron-Microscope Study of Damage Evolution Processes in Metals and Their Alloys Irradiated with High Energy Particles

Research Project

Project/Area Number 62420045
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionHiroshima University

Principal Investigator

SHIMOMURA Yoshiharu  Faculty of Engineering, Hiroshima University, Professor, 工学部, 教授 (40033831)

Co-Investigator(Kenkyū-buntansha) MUKODA Ichiro  Faculty of Engineering Hiroshima University, Research Assoc., 工学部, 助手 (70209980)
KITANO Yasuyuki  Faculty of Science, Hiroshima University, Assoc. Professor, 理学部, 助教授 (20033855)
FUKUSHIMA Hiroshi  Faculty of Engineering, Hiroshima University, Research Assoc., 工学部, 助手 (70156769)
YAMAKAWA Khoji  Faculty of Engineering, Hiroshima University, Assoc. Professor, 工学部, 助教授 (50029493)
Project Period (FY) 1987 – 1990
KeywordsCryotransfer Electron Microscopy / Low Temperature Fission Neutron irradiation / Fusion Neutron Irradiation / Structure of Displacement Damage Cascades / Formation of Voids / 2-1 / 2-D Method / Molecular Dynamical Computer Simulation / Cascade Energy Overlapping
Research Abstract

In the present work, we developed the cryotransfer technique of electron microscopy of ion- and neutron-irradiated at low temperature. From the experimental results of cryotransfer TEM of ion-, fission-neutron- and fusion-neutron-irradiated metals at low temperature, the following processes are decleared for the formation and evolution of damage cascades in high energy particle-irradiated metals. (1) When the primary snock-on atom is generated in metals, it stops after the collision with other lattice atoms and forms the displacement damage cascade whose the central part is occupied by high concentration of vacancies and is surrounded by the interstitial mantle. Previously it was believed that vacancies agglomerate to form TEM visible clusters (i. e. cascade collapse) and interstitials escapes to nearby sinks. In the present work, it was found that vacancies form sub-electron microscope size of clusters which are invisible by TEM while interstitials form TEM visible clusters. (2) It wa … More s clarified that sub-EM sizes of clusters of both vacancy and interstitial type were formed together with visible defects. (3) With increasing the fluence, TEM-invisible clusters tend to change to TEM visible clusters. This occurs due to the assistance of lattice relaxation by emitted energies from new cascades formed nearby previously formed ones. This effect is named by the present scientists "cascade energy overlapping". We believe that this effect is due to the shock-wave emitted at new formed cascade. The details of mechanism is at present studying by molecular-dynamical simulation with super-computer.
(4) Interstitial atoms are emitted intensely towards the outside of cascade core and form TEM visible clusters. The distance was found to be fairly larger when it was compared with that due to the replacement collision sequence. We are proposing that an interstitial atom is transported by surfriding mechanism on the shock wave generated. This may be a reason why many interstitial dot defects form at concentrated place (i. e. groupings). These point defect processes of the formation of damages in metals which are irradiated at high temperature was examined extensively especially for the damage structure evolution and void formation. Less

  • Research Products

    (36 results)

All Other

All Publications (36 results)

  • [Publications] 下村 義治: "Cascade energy overlapping effect on defect structure development disclosed by cryoーtrnsfer observation of DーT neutronーirradiated" Materials Science Forum. 15ー18. 1093-1098 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "20 K cryoーtransfer TEM observation of nascent displacement cascade damages in low temperature DーT neutronーirradiated metals at RTNSーII" Journal of Nuclear Materials. 155ー157. 1181-1189 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福島 博: "Nature and stability of TEM observed defects in 14ーMeV neutronーirradiated Au and Cu" Journal of Muclear Materials. 155ー157. 1205-1210 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山川 浩二: "Defects in fissionーneutron irradiated Mo at high temperature in the Joyo reactor" Journal of Nuclear Materials. 155ー157. 1211-1216 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福島 博: "Irradiation damages due to ions created in the vicinity of a filament in a TEM" J.Electron Microsc.38. 473-476 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福島 博: "Cryotransfer transmission electron microscopy experiment of lowーtemperature 14 MeVーneutronーirradiated aluminium" Phil.Mag.A60. 415-431 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "Point Defect Processes of damaging in DーT neutronーirradiated metals revealed by low temperature cryotransfer TEM method" Ann.Res.Report of Japanese contributions for Japanーus collaboration on RTNSーII utilization(Japanーus fusion cooperation program,Monbusho). 39-101 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西口 理恵子: "Comparison of PKA energy speactra,gasーatom production and damage energy deposition in neutron irradiation at various facilities" Journal of Nuclear Materials. 176. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 渡辺 仁志夫: "Computer simulation of displacement cascade structures in DーT neutronーirradiated Au,Ag,Cu,Ni and Al with the MARLOWE code" Journal of Nuclear Materials. 176. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福島 博: "On the nature of TEMーobserved defect clusters in lowーdose neutronーand ionーirradiated Cu,Ag and Au at room temperature" Journal of Nuclear Materials. 176. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福島 博: "Annealing experiments of low temperature 14 MeV neutronーirradiated ordered and disordered Cu_3Au by TEM" Journal of Nuclear Materials. 176. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "Cascada structure in low temperature fission and fusion neutronーirradiated metals" Journal of Nuclear Materials. 174. 210-219 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山川 浩二: "Types of damages in fissionーneutron irradiated Cu and Cuーdilute alloys at 200℃" The Science Reports of the Research Institutes Tohoku Univ.A35.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "Fundamental Processes of Damage Formation in Neutronーirradiated Metals" The Science Reports of the Research Institutes Tohoku Univ.A35.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "Structure of small point defect clusters in irradiated Cu by computer simulation" Proc of International Conference of Fusion Reactor Materialsー5(ICFRMー5)(Nov.1991,Florida,USA).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "GROUPINGS OF INTERSTITIAL CLUSTERS IN DーT NEUTRON IRRADIATED PURE AU,AG AND CU" Proc of International Conference of Fusion Reactor Materialsー5(ICFRMー5)(Nov.1991,Florida,USA).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山川 浩二: "VOID FORMATION IN NEUTRONーIRRADIATED Cu AND IT′S ALLOYS" Proc of International Conference of Fusion Reactor Materialsー5(ICFRMー5)(Nov.1991,Florida,USA).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 下村 義治: "Structural Relaxation of Point Defect Clusters in Irradiated Cu" Proc.of IEA workshop on radiation damage computer simulation(Hay,1991 La Jolla,California USA).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Shimomura, H. Fukushima, M. Kiritani, and M. W. Guinan: ""Cascade energy overlapping effect on defect structure development disclosed by cryotransfer observation of D-T neutron-irradiated metals"" Materials Science Forum. Vol. 15-18. 1093-1098 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimomura, M. W. Guinan, H. Fukushima, P. A. Hahn and M. Kiritani: ""20 K cryo-transfer TEM observation of nascent displacement cascade damages in low temperature D-T neutron-irrradiated metals at RTNS-II"" Journal of Nuclear Materials. Vol. 155-157. 1181-1187 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fukushima, Y. Shimomura and M. W. Guinan: ""Nature and stability of TEM observed defects in 14-MeV neutron-irradiated Au and Cu"" Journal of Nuclear Materials. Vol. 155-157. 1205-1210

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yamakawa and Y. Shimomura: ""Defects in fission-neutron irradiated Mo at high temperature in the Joyo reactor"" Journal of Nuclear Materials. Vol. 155-157. 1211-1216

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fukushima and Y. Shimomura: ""Irradiation damages due to ions created in the vicinity of a filament in a TEM"" J. Electron Microscopy. Vol. 38. 473-476 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fukushima, Y. Shimomura, M. W. Guinan and M. Kiritani: ""Cryotransfer transmission electron microscopy experiment of low-temperature 14 MeV-neutron-irradiated aluminum"" Philosophical Magazine. Vol. A60. 415-431 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimomura, H. Fukushima, M. W. Guinan, P. A. Hahn and M. Kiritani: ""Point defect processes of damaging in D-T neutron-irradiated metals revealed by low temperature cryotransfer TEM method"" Ann. Res. Report of Japanese Contributions for Japan-US Collaboration on RTNS-II Utilization (Monbusho). 39-101 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Nishiguchi, Y. Shimomura, P. A. Hahn, M. W. Guinan and M. Kiritani: ""Comparison of PKA energy spectra, gas-atom production and damage energy deposition in neutron irradiation at various facilities"" Journal of Nuclear Materials. Vol. 176. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Watanabe, R. Nishiguchi and Y. Shimomura: ""Computer simulation of displacement cascade structures in D-T neutron-irrradiated Au, Ag, Cu, Ni and Al with the MARLOWE code"" Journal of Nuclear Materials. Vol. 176. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fukushima, Y. Shimomura and H. Yoshida: ""On the nature of TEM-oberved defect clusters in low-dose neutron- and ionーirradiated Cu, Ag and Au at room temperature"" Journal of Nuclear Materials. Vol. 176. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fukushima, Y. Shimomura, M. W. Guinan, P. A. Hahn and M. Kiritani: ""Annealing experiments of low temperature 14 MeV neutron-irradiated ordered and disordered Cu_3Au by TEM"" Journal of Nuclear Materials. Vol. 176. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimomura, H. Fukushima and M. W. Guinan: ""Cascade structure in low temperature fission and fusion neutron-irradiated metals"" Journal of Nuclear Materials. Vol. 174. 210-219 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yamakawa, A. Kojima and Y. Shimomura: ""Types of damages in fission-neutron irradiated Cu and Cu-dilute alloys at 200゚C"" The Science Reports of the Research Institutes Tohoku University. Vol. A35, No. 2. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimomura, H. Fukushima and R. Nishiguchi: ""Fundamental processes of damage formation in neutron-irradiated metals"" The Science Reports of the Research Institutes Tohoku University. Vol. A35, No. 2. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimomura, R. Nishiguchi, T. Diaz de la Rubia and M. W. Guinan: ""Structure of small point defect clusters in irradiated Cu by computer simulation"" Proc. of Int. Conf. on Fusion Reactor Materials-5 (ICFRM-5). (Nov. 1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimomura, H. Fukushima and M. W. Guinan: ""Groupings of interstitial clusters in D-T neutron irradiated pure Au, Ag and Cu"" Proc. of Int. Conf. on Fusion Reactor Materials-5 (ICFRM-5). (Nov. 1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yamakawa, I. Mukouda. and Y. Shimomura: ""Void formation in neutron-irradiated Cu and it's alloys"" Proc. of Int. Conf. on Fusion Reactor Materials-5 (ICFRM-5). (Nov. 1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shimoura, R. Nishiguchi, T. Diaz de la Rubia and M. W. Guinan: ""Structural relaxation of point defect clusters in irradiated Cu." Proc. of IEA workshop on radiation damage computer simulation. La jolla, California, USA. (May, 1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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