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====<!--5.1.4.4 -->Copper-Silver-(Cadmium) Alloys (Silver Bronze)====

Besides the low-allowed CuAg0.1 other copper materials with higher silver contents (2-6 wt%) are also used as contacts carrier materials. Some of them contain additionally 1.5 wt% Cd. The phase diagram <xr id="fig:Phase diagram of copper-silver for the range of 0 – 40 wt% silver"/> <!--(Fig. 5.17) --> shows that in principle the CuAg alloys can be precipitation hardened, but the possible increase in mechanical strength is rather small.

Copper-silver alloys have good spring properties and compared to other spring materials have a high electrical conductivity <xr id="tab:tab5.13"/> <!--(Tab. 5.13) --> and <xr id="tab:tab5.14"/> <!--(Tab. 5.14)-->. The mechanical strength values in the strongly worked condition are comparable to those of the copper-tin alloys. Work hardening and softening behavior are shown for the example of CuAg2 [[#figures5|(Figs. 13 – 15)]]<!--(Figs. 5.18 – 5.20)-->. For the relaxation behavior the silver bronzes are superior to German silver and tin bronze.

<caption>'''<!--Table 5.13: -->Physical Properties of Selected Copper-Silver-(Cadmium) Alloys'''</caption>

<caption>'''<!--Table 5.14: -->Mechanical Properties of Selected Copper-Silver-(Cadmium) Alloys'''</caption>

<xr id="fig:Phase diagram of copper-silver for the range of 0 – 40 wt% silver"/> <!--Fig. 5.17: --> Phase diagram of copper-silver for the range of 0 – 40 wt% silver

<xr id="fig:Strain hardening of CuAg2 by cold working"/> <!--Fig. 5.18: --> Strain hardening of CuAg2 by cold working

<xr id="fig:Softening of CuAg2 after 1 hr annealing after 40% cold working"/> <!--Fig. 5.19: --> Softening of CuAg2 after 1 hr annealing after 40% cold working

<xr id="fig:Softening of CuAg2 after 1 hr annealing after 80% cold working"/> <!--Fig. 5.20: --> Softening of CuAg2 after 1 hr annealing after 80% cold working