Internal friction and electrical resistivity measurements in Cu and Ag alloys after neutron irradiation at low temperature. 1

Internal friction, elastic modulus, and electrical resistivity are measured for dilute Cu and Ag alloys after fast neutron irradiation at about 5 K. The suppression of the stage I recovery in electrical resistivity is studied in connection with the trapping radii and the atomic sizes of solute atoms. In internal friction measurements of Cu-Be, Ag-Cu, Ag-Zn, and Ag-Si with undersized solute atoms, the relaxation peaks disappear by annealing at low temperatures. The annealing temperatures of internal friction peaks in various alloys are investigated in connection with the annealing stages in the electrical resistivity. (author)