Changes

====<!--5.1.6.1 -->Copper-Beryllium Alloys (Beryllium Bronze)====

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:Physical_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:Mechanical Properties of Selected Copper-Beryllium Alloys"/> <!--(Table 5.18) --> and [[#figures7|(Figs. 43 – 75)]]<!--(Figs. 5.29 - 5.31)-->.

<xr id="fig:Phase_diagram_of_copperberyllium_with_temperature_ranges_for_brazing_and_annealing_treatments"/> <!--Fig. 5.28: --> Phase diagram of copper- beryllium with temperature ranges for brazing and annealing treatments

<xr id="fig:Precipitation_hardening_of_CuBe2_at_325°C_after_different_cold_working"/> <!--Fig. 5.29: --> Precipitation hardening of CuBe2 at 325°C after different cold working

<xr id="fig:Precipitation_hardening_of_CuBe2_(soft)_at_325°C"/> <!--Fig. 5.30: --> Precipitation hardening of CuBe2 (soft) at 325°C

<xr id="fig:Precipitation_hardening_of_CuBe2_(half hard)_at_different_annealing_temperatures"/> <!--Fig. 5.31: --> Precipitation hardening of CuBe2 (half hard) at different annealing temperatures

<caption>'''<!--Table 5.17: -->Physical Properties of Selected Copper-Beryllium Alloys'''</caption>

<caption>'''<!--Table 5.18: -->Mechanical Properties of Selected Copper-Beryllium Alloys'''</caption>