Stress-Induced Ordering of Point Defects in Copper Near 10°K

An anelastic process near 10^∘{}K has been found in proton-irradiated copper. It is tentatively identified as the result of stress-induced ordering of the interstitial member of a close pair. The reorientation occurs without annealing being observed. The thermal activation energy for reorientation is 0.015 eV; the strain symmetry axis is in the $〈111〉$ direction.