Abstract
The effect of fast neutron irradiation on the rate controlling mechanism for slip in iron and dilute iron alloys has been investigated. Stress relaxation techniques have been used to determine the components of the applied stress and the activation volumes. The activation enthalpy has been estimated from the temperature dependence of the effective stress. To reduce the problem of heterogeneous deformation in irradiated iron the tests were performed at low strains (<0.01). Based on the parameters determined in this type of analysis it is concluded that irradiation to 2 × 10 18 nvt ( E > 1 MeV) does not change the deformation mechanism in iron and dilute iron-carbon alloys but merely increases the long range internal stress However, after the source hardening has been overcome by prestrain, some modification in the flow mechanism may take place. The yielding process near room temperature apparently can be changed by nitrogen additions After irradiation however, the process appears to revert to the same one operating in the base Ferrovac iron.
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