Response of Metallic Glasses Fe sub 40 Ni sub 40 P sub 14 B sub 6 and Fe sub 80 B sub 20 to Irradiation with 800-MeV Protons

摘要

Metallic glasses with compositions of Fe sub 40 Ni sub 40 P sub 14 B sub 6 and Fe sub 80 B sub 20 were irradiated in the 800 MeV proton beam at the Los Alamos Meson Physics Facility while the electrical resistance and length changes were monitored. The resistance and the length of the first alloy were both found to increase and saturate with dose to delta R/R approx. = 5 x 10 exp -3 and delta L/L approx. = 2 x 10 exp -3 . For the second alloy the total dose of 1.1 x 10 exp 19 p/cm exp 2 , which was calculated to give roughly 0.12 dpa, was slightly less than that required for saturation. No annealing of these increases was observed for anneals from room temperature to 250 exp 0 C. These results are interpreted in terms of a model in which collision cascades create small regions of increased atomic disorder which fully overlap each other at saturation. (ERA citation 06:030933)