Atomic Defects in Metals · Cr-Ni

This chapter dicusses the properties and interactions of atomic defects in concentrated alloys like Cr_xNi_1-x. Defect annealing of the Cr_xNi_1-x has been investigated after neutron irradiation, after cold work and after laser irradiation that is expected to produce similar defects as plastic deformation due to the large thermal strains in the material. The influence of the state of order i.e. (a) quenched (only small degree of SRO) or (b) K-state (special state of SRO), or (c) long range order on the defect reactions has been of special interest: Δρ increases during the evolution of the K-state and decreases with increasing LRO. The annealing is shown for different treatments of the alloy before the irradiation. From detailed investigations of the ordering kinetics (formation of the K-state) quantitative data for vacancies in the Cr_0.115Ni_0.885 alloy have been obtained. Isochronal annealing of a CrNi₂ alloy after neutron irradiation and annealing is shown for different treatments of the alloy before irradiation. Isochronal annealing of the electrical resistivity after plastic deformation of an ordered CrNi₂ alloy and data are normalized by the resistivity ρ₀ of the alloy before deformation, tensile deformation and laser irradiation. Differential annealing is illustrated as well.