Abstract
Pure zinc single crystals were irradiated at liquid nitrogen temperature in the RA-1 reactor of CNEA up to fast neutron doses of 3 × 10 21 nm −2. Their plastic and fracture behaviour were studied at 77 K. Radiation hardening in zinc and copper was compared. It seems to be produced by the presence of similar irradiation-produced barriers to dislocation in both metals. For neutron doses greater than 4.5 × 10 20 nm −2 the ductility in crystals with easy glide orientations decreases rapidly by more than an order of magnitude. Fracture stress increased with dose, and it is dependent on crystallographic orientation. This fact shows that dislocation motion is necessary before fracture. Yield stress annealing experiments showed three important recovery stages located around 110, 160 and 210 K. The last stage, which is the most pronounced one, is hardly seen by electrical resistivity recovery.
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