Irradiation Disordering and Ordering of Cu sub 3 Au by Fusion Neutrons

摘要

Ordered and partially ordered Cu sub 3 Au alloys (S = .30 - .99) have been irradiated at 4K and 300K with fusion neutrons at RTNS-II. The disordering rate was measured by monitoring electrical resistivity. The analysis of 4K irradiations and a comparison with fission reactor irradiations indicated that the disordering rate depended upon the long-range order parameter, S, dS/d phi t = -S(k sub 1 -k sub 2 S), where k sub 1 and k sub 2 are scaled with damage energy. The results of 300K irradiation indicated that reordering competed significantly with disordering in the partially ordered sample. Compared to the results of 4K irradiation, the net disordering rate at 300K was higher than that at 4K. This difference and the dependence of disordering rate on S is discussed in terms of the effects of disorder and thermal displacements on cascade cooling processes. (ERA citation 11:025862)