Copper-Nickel- multi component alloys with 9 wt% Ni and 2 wt% Sn are used mainly as connector materials because of their suitable mechanical properties, their excellent relaxation behavior and their high corrosion resistance. Other advantages include their high temperature stability and the good solderability, even after longer storage. They are also used as base materials for clad profiles and tapes.
<xr id="fig:Phase_diagram_of_copper-nickel_for_the_range_of_0-50_wt_nickel"/><!--Fig. 5.21:--> Phase diagram of copper-nickel for the range of 0 – 50 wt% nickel
<xr id="fig:Electrical_conductivity_of_copper-nickel_alloys_as_a_function_of_nickel_content"/><!--Fig. 5.22:--> Electrical conductivity of copper-nickel alloys as a function of nickel content
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<sup>1)</sup> t: Strip thickness max. 0.5 mm
<xr id="fig:Strain hardening of copper-nickel alloys as a function of nickel content"/><!--Fig. 5.23:--> Strain hardening of copper-nickel alloys as a function of nickel content
<xr id="fig:Strain hardening of CuNi25 by cold working"/><!--Fig. 5.24:--> Strain hardening of CuNi25 by cold working
<xr id="fig:Softening of CuNi25 after 1 hr annealing after 50% cold working"/><!--Fig. 5.25:--> Softening of CuNi25 after 1 hr annealing after 50% cold working
<xr id="fig:Strain hardening of CuNi9Sn2 by cold working (Wieland)"/><!--Fig. 5.26:--> Strain hardening of CuNi9Sn2 by cold working (Wieland)
<xr id="fig:Softening of CuNi9Sn2 after 1 hr annealing after 60% cold working (Wieland)"/><!--Fig. 5.27:--> Softening of CuNi9Sn2 after 1 hr annealing after 60% cold working (Wieland)
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<figure id="fig:Strain hardening of copper-nickel alloys as a function of nickel content">
[[File:Strain hardening of copper nickel alloys as function.jpg|left|thumb|<caption>Strain hardening of copper-nickel alloys as a function of nickel content</caption>]]
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