Disks of pure Cu, and Cu which contained 0.17 to 10%Ni, were neutron-irradiated at 210 or 420C to doses of 13.5 or 14.9dpa, respectively. Void swelling was not observed in any of the specimens that were irradiated at 210C. Instead, a high density of stacking fault tetrahedra, and a moderate density of dislocation loops was observed. There was no evidence for defect cluster patterning (wall formation) in any of the specimens which were irradiated at 210C. The stacking fault tetrahedron density was independent of the Ni content, while the loop density was highest in an alloy which contained 2%Ni. Pronounced void swelling was observed in all of the specimens which were irradiated at 420C. The void swelling in material which contained 2%Ni exhibited a marked maximum in a 10μm-wide band adjacent to grain boundary denuded zones.

Microstructure of Cu-Ni Alloys Neutron Irradiated at 210 and 420C to 14dpa. S.J.Zinkle, B.N.Singh: Journal of Nuclear Materials, 2000, 283-287, 306-12