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→5.1.7.4 Softening Behavior
Through thermal activation at elevated temperatures the original mechanical material strength achieved by cold working or precipitation hardening can be reversed completely. The start of softening is mostly defined as the temperature at which a 10% reduction of mechanical strength is reached. It is dependent on the degree of initial cold working and the annealing temperature and time. For higher initial degrees of cold working degrees the softening temperature becomes lowered.
As expected, the softening temperature for pure copper is rather low. CuNi9Sn2 and CuSn1CrNiTi exhibit high softening temperatures ''<xr id="fig:Softening behavior for selected copper based materials"/> (Fig. 5.43)''.
<figure id="fig:Softening behavior for selected copper based materials">
Fig. 5.43: Softening behavior for selected copper-based materials after 40% cold working (Wieland)
[[File:Softening behavior for selected copper based materials.jpg|right|thumb|Softening behavior for selected copper-based materials after 40% cold working (Wieland)]]
</figure>
====5.1.7.5 Relaxation Behavior====
