Abstract
The dynamic mechanical properties of a Co-60 irradiated stress-graphitized pyrolytic carbon specimen were measured as a function of temperature from 80° to 750°K. The specimen received a range of gamma doses from 0·72 to 1400 megarads (MR). The dynamic elastic modulus, values increased with dose at all temperatures. An inverse annealing peak in the elastic modulus was detected after 7 MR gamma irradiation. This corresponded to about 10 −9 carbon atoms per atom displaced. Some evidence of the β (165°K), γ (340°K) and δ (440°K) internal friction, Q −1, peaks is obtained after 140 MR. The β peak is clearly detectable after 1400 MR. The results are compared and discussed with regard to results of previous investigations involving reactor irradiations.
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