Changes

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. 6 – 9)]]<!--Figs. 5.33-5.35-->, <xr id="tab:Physical Properties of Other Precipitation Hardening Copper Alloys"/><!--(Tables 5.19)--> and <xr id="tab:Mechanical Properties of Other Precipitation Hardening Copper Alloys"/><!--(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. <div id="figures5"> <xr id="fig:Copper corner of the copper-chromium phase diagram for up to 0.8 wt% chromium"/><!--Fig. 5.32:--> Copper corner of the copper-chromium phase diagram for up to 0.8 wt% chromium <xr id="fig:Softening of precipitation hardened and subsequently cold worked CuCr1"/><!--Fig. 5.33:--> Softening of precipitation-hardened and subsequently cold worked CuCr1 after 4hrs annealing <xr id="fig:Electrical conductivity of precipitation hardened CuCr 0.6"/><!--Fig. 5.34 a:--> Electrical conductivity of precipitation hardened CuCr 0.6 as a function of annealing conditions <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 <xr id="fig:Electrical conductivity and hardness of precipitation hardened CuCr 0.6"/><!--Fig. 5.35:--> Electrical conductivity and hardness of precipitation hardened CuCr 0.6 after cold working</div>