Copper-rich copper-beryllium alloys are precipitation hardenable. A portion of the Cu-Be phase diagram is shown here (ignore the line at 620 degrees C and assume that gamma1 and gamma2 are the same ph

Copper-rich copper-beryllium alloys are precipitation hardenable. A portion of the Cu-Be phase diagram is shown here (ignore the line at 620{eq}^\circ

{/eq}C and assume that {eq}\gamma_1

{/eq} and {eq}\gamma_2

{/eq} are the same phase). For a bulk composition of Cu 2wt% Be, which of the following processes would most likely generate a precipitation hardened material?

A. Solutionize at 950{eq}^\circ

{/eq}C, quench to 800{eq}^\circ

{/eq}C, then age harden at 620{eq}^\circ

{/eq}C

B. Solutionize at 800 {eq}^\circ

{/eq}C, quench to room temp, then age harden at 400{eq}^\circ

{/eq}C

C. Solutionize at 400 {eq}^\circ

{/eq}C, quench to room temp, then age harden at 800{eq}^\circ

{/eq}C

D. The composition is all wrong – you could not theoretically age harden a Cu 2wt% Be alloy