DIMENSIONAL CHANGES IN GRADE H-451 NUCLEAR GRAPHITE DUE TO ELECTRON-IRRADIATION

被引:30
|
作者
PEDRAZA, DF [1 ]
KOIKE, J [1 ]
机构
[1] OREGON STATE UNIV,CORVALLIS,OR 97331
关键词
ELECTRON IRRADIATION; NUCLEAR-GRADE GRAPHITE; POROSITY; DIMENSIONAL CHANGES;
D O I
10.1016/0008-6223(94)90095-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Porosity plays a very important role in the overall dimensional changes induced by irradiation in many graphitic materials. In the present study, a nuclear grade isotropic graphite, H-451, was irradiated in situ in the electron microscope in regions bordering existing pores. Selected area diffraction patterns of different regions of this material showed that graphite grade H-451 is a well-graphitized, single-phase material whose structure is essentially identical to that of highly oriented pyrolytic graphite (HOPG). Therefore, structural changes in the individual crystallites must be the same as found in HOPG in our previous study. Crystallites having either of the two principal orientations parallel to the direction of the electron beam, viz., the c-crystallographic axis direction parallel or normal to the beam, could easily be found in specimens thinned to electron transparency. Both pore opening and closure were detected during irradiation depending upon the crystalline orientation around the pore. With increasing electron dose, elongated pores bound by crystallites with their c axis normal to the pore surface closed, while pores bound by crystallites with their basal plane in the plane of the pore at the observation surface opened up. These effects are consistent with the dimensional changes observed in HOPG. The present results are compared with the macroscopic changes observed under reactor irradiation.
引用
收藏
页码:727 / 734
页数:8
相关论文
共 50 条
  • [21] TUNNELING SPECTROSCOPY STUDY OF MOLECULAR DEGRADATION DUE TO ELECTRON-IRRADIATION
    HANSMA, PK
    PARIKH, M
    SCIENCE, 1975, 188 (4195) : 1304 - 1305
  • [22] Dimensional change, irradiation creep and thermal/mechanical property changes in nuclear graphite
    Marsden, B. J.
    Haverty, M.
    Bodel, W.
    Hall, G. N.
    Jones, A. N.
    Mummery, P. M.
    Treifi, M.
    INTERNATIONAL MATERIALS REVIEWS, 2016, 61 (03) : 155 - 182
  • [23] Characterization of 3 MeV H+ irradiation induced defects in nuclear grade graphite
    Kim, Eung-Seon
    Kim, Yong-Wan
    SOLID STATE COMMUNICATIONS, 2010, 150 (35-36) : 1633 - 1636
  • [24] The formation of H*2 by electron-irradiation of hydrogenated Si
    Suezawa, M
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1999, 38 (7A): : L758 - L760
  • [25] Influence of H+ ion irradiation on the surface and microstructural changes of a nuclear graphite
    Yang, Seung Jae
    Choe, Jae-Myung
    Jin, Young-Gil
    Lim, Sun-Taek
    Lee, Kunsil
    Kim, Yern Seung
    Choi, Sooseok
    Park, Sang-Joon
    Hwang, Y. S.
    Kim, Gon-Ho
    Park, Chong Rae
    FUSION ENGINEERING AND DESIGN, 2012, 87 (04) : 344 - 351
  • [26] CHANGES OF DLTS SPECTRUM IN N-SI DUE TO 7-10 MEV ELECTRON-IRRADIATION
    KITAMURA, N
    WADA, T
    KAKEHI, M
    SHEN, JX
    JAPANESE JOURNAL OF APPLIED PHYSICS, 1981, 20 (10) : 1971 - 1972
  • [27] THIN-FILM ADHESION CHANGES INDUCED BY ELECTRON-IRRADIATION
    MITCHELL, IV
    WILLIAMS, JS
    SMITH, P
    ELLIMAN, RG
    APPLIED PHYSICS LETTERS, 1984, 44 (02) : 193 - 195
  • [28] LOW-TEMPERATURE ELECTRON-IRRADIATION DAMAGE AND RECOVERY IN PYROLYTIC-GRAPHITE
    IWATA, T
    NIHIRA, T
    MATSUO, H
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1972, 33 (04) : 1060 - &
  • [29] REDUCTION IN CONCENTRATION OF GOLD RECOMBINATION CENTERS DUE TO ELECTRON-IRRADIATION OF GERMANIUM
    BOYARKINA, NI
    SMIRNOV, LS
    STAS, VF
    SOVIET PHYSICS SEMICONDUCTORS-USSR, 1975, 8 (11): : 1431 - 1431
  • [30] Early Damage Mechanisms in Nuclear Grade Graphite under Irradiation
    Eapen, J.
    Krishna, R.
    Burchell, T. D.
    Murty, K. L.
    MATERIALS RESEARCH LETTERS, 2014, 2 (01): : 43 - 50