Characteristics of 15 MeV and fission neutron damage in niobium
Displacement damage by 15 MeV (d-Be source) and fission neutrons at 30$sup 0$C in high purity niobium single crystals has been studied by transmission electron microscopy. The fluence of the 15 MeV neutrons was 1.5-- 2.0 x 10$sup 17$ n/cm$sup 2$ and the fluence of the fission neutrons (5 x 10$sup 17$ n/cm$sup 2$) was chosen so that samples from both types of irradiations had approximately the same damage energy. In both 15 MeV and fission neutron irradiated specimens, the loops were observed to be about $sup 2$$/$$sub 3$ interstitial and $sup 1$$/$$sub 3$ vacancy type. The analysis of Burgers vectors of the dislocation loops showed that more than $sup 2$$/$$sub 3$ of the loops were perfect a/2(111) and that the rest were a/2(110) faulted. It is concluded that at equal damage energies, the detailed nature of the damage is the same for 15 MeV and fission neutron irradiated niobium. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn. (USA)
- NSA Number:
- NSA-33-022984
- OSTI ID:
- 4067642
- Report Number(s):
- CONF-760209--6
- Country of Publication:
- United States
- Language:
- English
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