DT fusion neutron radiation strengthening of copper and niobium

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The initial results of a comparative study of the radiation strengthening and damage structures produced in Cu and Nb by D-T fusion and fission reactor neutrons are described. The radiation strengthening produced by a given fluence of fusion neutrons above about 10$sup 17$n/cm$sup 2$ is equal to that produced by a fluence of fission reactor neutrons (E greater than 0.1 MeV) ten times as great. This difference is about twice as large as would be expected if the strengthening scaled with damage energy or dpa. Initial transmission electron microscopy observations of the damage structures in fusion and fission reactor neutron ... continued below

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Pages: 50

Creation Information

Mitchell, J.B.; Van Konynenburg, R.A.; Echer, C.J. & Parkin, D.M. October 30, 1975.

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Description

The initial results of a comparative study of the radiation strengthening and damage structures produced in Cu and Nb by D-T fusion and fission reactor neutrons are described. The radiation strengthening produced by a given fluence of fusion neutrons above about 10$sup 17$n/cm$sup 2$ is equal to that produced by a fluence of fission reactor neutrons (E greater than 0.1 MeV) ten times as great. This difference is about twice as large as would be expected if the strengthening scaled with damage energy or dpa. Initial transmission electron microscopy observations of the damage structures in fusion and fission reactor neutron irradiated copper indicate that the same type of primary structural defects, vacancy and interstitial point defect clusters and small dislocation loops with a/3 (111) and a/2 (110) Burgers vectors, are produced in both cases. The difference in the radiation strengthening produced by fusion and fission reactor neutrons in Cu appears to result from a substantially greater rate of accumulation of damage, in the form of point defect clusters, during irradiation with fusion neutrons than during irradiation with fission reactor neutrons plus a significant difference in the size and spatial distributions of the damage clusters. (auth)

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Pages: 50

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Dep. NTIS

Source

  • International conference on radiation effects and tritium technology for fusion reactors, Gatlinburg, Tennessee, USA, 1 Oct 1975

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  • Report No.: UCRL--77357(Rev.1)
  • Report No.: CONF-751026--32
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4152915
  • Archival Resource Key: ark:/67531/metadc863198

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  • October 30, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 18, 2016, 1:52 p.m.

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Mitchell, J.B.; Van Konynenburg, R.A.; Echer, C.J. & Parkin, D.M. DT fusion neutron radiation strengthening of copper and niobium, article, October 30, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc863198/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.