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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 Figs. 5.33-5.35 ''(Tables 5.19 and 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.
<figure 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
[[File:Copper corner of the copper chromium phase diagram.jpg|right|thumb|Copper corner of the copper-chromium phase diagram for up to 0.8 wt% chromium]]
</figure>
Fig. 5.33: Softening of precipitation-hardened and subsequently cold worked CuCr1 after 4hrs annealing
