Mechanical dynamical spectroscopy in low-flux neutron irradiated pure copper

The effects of low-flux neutron irradiation performed at room temperature on mechanical dynamical spectroscopy in pure copper (99.99%) are shown. A new damping peak at approximately 730K appears in the irradiated polycrystalline samples, which is absent from the unirradiated and single-crystals one. This peak could be controlled by a cooperative mechanism between grain boundary sliding, the dragging of point defects which follow the disloction line and the stress assisted break away of dislocations from the pinning points which were generated by the irradiation process.