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→5.1.6.2.1 Copper-Chromium Alloys
=====5.1.6.2.1 Copper-Chromium Alloys=====
As the phase diagram shows, copper-chromium has a similar hardening profile compared to CuBe <xr id="fig:Copper corner of the copper-chromium phase diagram for up to 0.8 wt% chromium"/>(Fig. 5.32). In the hardened stage CuCr has limitations to work hardening. Compared to copper it has a better temperature stability with good electrical conductivity. Hardness and electrical conductivity as a function of cold working and precipitation hardening conditions are illustrated in [[#figures8|(Figs. 43 – 75)]]Figs. 5.33-5.35 '', (Tables Tab. 5.19 and Tab. 5.20)''.
Copper-chromium materials are especially suitable for use as electrodes for resistance welding. During brazing the loss in hardness is limited if low melting brazing alloys and reasonably short heating times are used.
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<xr id="fig:Hardness of precipitation hardened CuCr 0.6"/> Fig. 5.34 b: Hardness of precipitation hardened CuCr 0.6 as a function of annealing conditions[[File<xr id="fig:Hardness Electrical conductivity and hardness of precipitation hardened CuCr 0.6"/> Fig. 5.35: Electrical conductivity and hardness of precipitation hardened CuCr 0.jpg|right|thumb|6 after cold working</div> <div class="multiple-images"><figure id="fig:Softening of precipitation hardened and subsequently cold worked CuCr1"> </figure> <figure id="fig:Electrical conductivity of precipitation hardened CuCr 0.6"> </figure> <figure id="fig:Hardness of precipitation hardened CuCr 0.6 as a function "></figure> <figure id="fig:Electrical conductivity and hardness of annealing conditions]]precipitation hardened CuCr 0.6"> </figure> </div><div class="clear"></div>
'''Table 5.19: Physical Properties of Other Precipitation Hardening Copper Alloys''' (2 Teile!)