STUDY OF LOCALIZED PLASTIC FLOW IN IN COLD DEFORMATION MODE OF COPPER-NICKEL ALLOY

The stages and kinetics of development of sites of localized plastic deformation in the polycrystalline copper-nickel alloy Cu-40 %Ni-1.5%Mn in the temperature range 173 – 297 K have been studied. Currently, copper-nickel alloys are used in various industries due to the fact that they have high anti-corrosion properties and have good ductility. Previously, the localization of plastic flow during impurity strengthening of materials using the basic principles of autowave plasticity models was practically not studied. It is known that localization of plastic flow is often the cause of destruction of materials during technological processes associated with large plastic deformations. To identify the nature of the evolution of autowaves of localized plasticity in samples, the spatiotemporal distributions of local strains directly during the stretching process were studied using two-exposure speckle photography every 0.2 % of the total strain. Tension diagrams in the temperature range under study are parabolic type diagrams. It has been shown that the temperature dependences of the mechanical properties indicate a high level of strength and ductility of the annealed alloy at relatively low temperatures. Data from backscattered electron diffraction analysis showed that after annealing, more than 80 % of the cubic component is observed in the alloy texture. The observed patterns of localized deformation distributions contain important information about the nature of plastic flow. The shapes of the localization patterns observed during plastic deformation unambiguously correspond to the laws of work hardening operating at different stages. A change in the spatial period and speed of autowaves localizing plastic deformation with decreasing temperature was revealed.

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