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Changes of the mechanical properties of metals after heavy ion bombardment

The results of experiments aimed to study the behaviour of the metals Ni, Cu and Zr irradiated by 230 MeV Ne ions are described. Great changes in the yield strength Δσ0.2, as function of irradiation dose are obtained in the fluence range 1014−5 × 1015ion/cm2. These results are discussed in the framework of a model assuming the interaction between old clusters and newly produced cascades. The data are described by the dependence of the type Δσ = A[1 - exp (– BΦt]1/2.