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Direct Observation of Radiation Damage In Molybdenum

  • J. D. Meakin
  • A. Lawley
Conference paper

Abstract

The primary objective of the research is to study the effect of neutron irradiation, both at ambient and elevated temperatures, on the structure of molybdenum, and to compare and contrast with previous observations on copper and nickel. The defect structures produced by neutron irradiation at doses up to approx. 1020 nvt, at temperatures from ambient to 600°C, are being studied using transmission electron microscopy. For low doses approx. 1018 nvt at 600°C, large prismatic dislocation loops (average diameter 1100 A) were observed on planes approximately parallel to 111, and having the normal slip vector 1/2 < 111>. Diffraction contrast experiments were carried out on these loops which proved conclusively that these were formed by the collapse of interstitial aggregates. By comparison, ambient temperature irradiation to this dose level produced a structure with a high density of spots which were not readily resolvable as loops. Specimens have also been irradiated to approx. 1020 nvt at ambient temperature and have been found to contain a higher density of the unresolved damage. The mechanism of the formation of the loops and their interaction with glide dislocations is discussed.

Keywords

Diffusion Distance Burger Vector Radiation Damage Vacancy Cluster Operating Reflection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    D. J. Mazey, R. S. Barnes, and A. Howie, Phil. Mag. 7: 1861 (1962).CrossRefGoogle Scholar
  2. 2.
    B.C. Masters, Nature 200: 254 (1963).CrossRefGoogle Scholar
  3. 3.
    P. B. Hirsch, A. Howie, and M. J. Whelan, Phil. Trans. Roy. Soc. (London) A257: (1960).Google Scholar
  4. 4.
    A. Lawley, Electronics 32: 39 (1959).Google Scholar
  5. 5.
    P.R. Strutt, Rev. Sci. Instr. 32: 411 (1961).CrossRefGoogle Scholar
  6. 6.
    A. Lawley and H. L. Gaigher, Phil. Mag. 8: 1713 (1964).CrossRefGoogle Scholar
  7. 7.
    H. Wagenblast, F. E. Fujita, and A. C. Damask, Acta Met. (in press).Google Scholar
  8. 8.
    D. Kuhlmann-Wilsdorf, Phil. Mag. 3: 125 (1958).CrossRefGoogle Scholar
  9. 9.
    B. Mastel, H. E. Kissinger, J. J. Laidler, and T. K. Bierlein, J. Appl. Phys. 34: 3637 (1963).CrossRefGoogle Scholar
  10. 10.
    H.G. F. Wilsdorf, Phys. Rev. 3: 172 (1959).Google Scholar
  11. 11.
    M. J. Makin and S.A. Manthorpe, Phil. Mag. 8: 1725 (1963).CrossRefGoogle Scholar
  12. 12.
    M.S. Wechsler, ASTM Bull., S. Tech. Pub. No. 341, 86 (1963).Google Scholar
  13. 13.
    J. Nihoul, Phys. Stat. Solidi 2: 308 (1962).CrossRefGoogle Scholar

Copyright information

© Plenum Press 1965

Authors and Affiliations

  • J. D. Meakin
    • 1
  • A. Lawley
    • 1
  1. 1.The Franklin Institute LaboratoriesPhiladelphiaUSA

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