An in-situ field ion microscope study of irradiated tungsten II. Analysis and interpretation

R. M. Scanlan, D. L. Styris, D. N. Seidman

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34 Scopus citations


In Part I (see previous paper) the results of a series of experiments demonstrated that self-interstitial atoms (SIAs) were immobile at an irradiation temperature of 15°k, and that these same SIAs subsequently underwent long-range migration at temperatures as low as ~28°k. In this paper we analyse these results quantitatively, and obtain approximate values of the diffusion coefficient [≃0·22 exp (–0·085 ev/kT) cm2 sec–1], and the enthalpy change of migration of the SIA (~ 0·085 ev). The effect of the electric field on the diffusivity of a single SIA was considered, and it was shown that the volume change of migration for a SIA must have been 2 ≲ 0·1 atomic volume. The problems of SIA clustering and the formation of SIA-impurity atom clusters were considered and were shown to be possible sources of the broad annealing spectrum reported in Part I. In addition the relationship of the post-anneal field evaporation experiments to the 2-interstitial recovery model was discussed. Finally, the present experiments were compared with other Stage I recovery data on irradiated tungsten.

Original languageEnglish (US)
Pages (from-to)1459-1478
Number of pages20
JournalPhilosophical Magazine
Issue number186
StatePublished - Jun 1971

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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