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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 At higher initial degrees of cold working degrees forming, the softening temperature becomes is 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)-->.
