Atomic Replacement in Ordered Cu₃Au Alloy Irradiated with Protons, α-Particles and Carbon Ions from a Cyclotron

The resistivity increase by charged particle irradiation at liquid helium temperature has been measured on ordered and disordered Cu 3 Au alloys. Comparison of the resistivity increase rate among these alloys and Cu is made for the same damage energy density. The number of disordering replacements per Frenkel pair in ordered Cu 3 Au is estimated to be 27. The Snyder-Neufeld integral equation on the damage function is solved under the condition including the effect of focusing replacements. By modification of the result a semiempirical damage function is obtained.