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Copper-zinc alloys are widely used as contact carrier materials in switching devices for electrical power engineering because of their high electrical conductivity, the higher mechanical strength combined with good formability compared to pure copper <xr id="tab:Physical Properties of Selected Copper-Zinc AlloysPhysical_Properties_of_ Selected_Copper_Zinc_Alloys"/> (Tab. 5.7) and <xr id="tab:Mechanical Properties of Selected Copper-Zinc AlloysMechanical_Properties_of_Selected_Copper_Zinc_Alloys"/> (Tab. 5.8), and at the same time their reasonable economic costs. Especially suitable are the brasses with up to 37 wt% Zn content which are according to the phase diagram all made up from the &alpha; -phase of the CuZn system <xr id="fig:Phase diagram of copper-zinc for the range of 0-60 wt% zincPhase_diagram_of_copper_zinc_for_the_range_of_0_60_wt_zinc"/> (Fig. 5.5). It is important to note the strong dependence of the electrical conductivity and mechanical strength on the zinc content <xr id="fig:Mechanical properties of brass depending on the copper content (after cold working of 0 and 50%)Mechanical_properties_of_brass_ depending_on_the_copper_content_after_cold_working_of_0_and_50"/> (Fig. 5.6).

<figtable id="tab:Physical Properties of Selected Copper-Zinc AlloysPhysical_Properties_of_ Selected_Copper_Zinc_Alloys">

<figtable id="tab:Mechanical Properties of Selected Copper-Zinc AlloysMechanical_Properties_of_Selected_Copper_Zinc_Alloys">

<xr id="fig:Phase diagram of copper-zinc for the range of 0-60 wt% zincPhase_diagram_of_copper_zinc_for_the_range_of_0_60_wt_zinc"/> Fig. 5.5: Strain hardening of Ag 99.95 by cold working

<xr id="fig:Mechanical properties of brass depending on the copper content (after cold working of 0 and 50%)Mechanical_properties_of_brass_ depending_on_the_copper_content_after_cold_working_of_0_and_50"/> Fig. 5.6: Mechanical properties of brass depending on the copper content (after cold working of 0 and 50%)