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→5.1.6.1 Copper-Beryllium Alloys (Beryllium Bronze)
The cause for precipitation hardening of CuBe materials is the rapidly diminishing solubility of beryllium in copper as temperature decrease. As the
phase diagram for CuBe shows, 2.4 wt% of Be are soluble in Cu at 780°C <xr id="fig:Phase diagram of copperberyllium with temperature ranges for brazing and annealing treatments"/> (Fig. 5.28). In this temperature range annealed CuBe alloys are homogeneous(solution annealing). The homogeneous state can be frozen through rapid cooling to room temperature (quenching). Through a subsequent annealing at 325°C the desired precipitation hardening is achieved which results in a significant increase in mechanical strength and electrical conductivity of CuBe <xr id="tab:tab5.17Physical Properties of Selected Copper-Beryllium Alloys"/> (Tab. 5.17). The final strength and hardness values depend on the annealing temperature and time as well as on the initial degree of cold working <xr id="tab:tab5.18Mechanical Properties of Selected Copper-Beryllium Alloys"/> (Table 5.18) and [[#figures7|(Figs. 43 – 75)]](Figs. 5.29 - 5.31).
<figtable id="tab:tab5.17Physical Properties of Selected Copper-Beryllium Alloys">
'''Table 5.17: Physical Properties of Selected Copper-Beryllium Alloys'''
<figtable id="tab:tab5.18Mechanical Properties of Selected Copper-Beryllium Alloys">
'''Table 5.18: Mechanical Properties of Selected Copper-Beryllium Alloys'''
