Copper-rich copper beryllium alloys are precipitation hardenable. A portion of t

Question

Copper-rich copper beryllium alloys are precipitation hardenable. A portion of the Cu-Be phase diagram (Fig 11.30) is shown here (ignore the line at 620 degree C and assume that gamma_1 and gamma_2 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? Solutiomze at 950 degree C. quench to 800. then age harden at 620 degree C Solutiomze at 800 degree C, quench to room temp, then age harden at 400 degree C Solutiomze at 400 degree C, quench to room temp, then age harden at 800 degree C The composition is all wrong - you could not theoretically age harden a Cu 2wt% Be alloy

Explanation / Answer

9. For Cu-Be alloy, most likely case to generate a precipitation hardened material is,

c. solutinize at 800 oC, quench to room temperature and then harden at 400 oC.

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