(a) Stirling silver is an alloy of silver with 7.5 percent of copper. Describe the structure that one should expect if a specimen of stirling silver were to be heated from room temperature to 782°C, and allowed to come to equilibrium at this latter temperature.
(b) If the specimen of stirling silver, equilibrated at 782°C, is now slowly cooled to 400°C, what would be the nature of the microstructure? Give the amount and composition of each phase.
(c) Finally, assume the specimen is cooled very rapidly (quenched) from 782°C to 400°C. Describe the structure that one might expect.
Solution:
(a) 782°C is only 3° above the eutectic temperature at 779°C. The ? phase extends to 8.8 percent copper at the eutectic temperature. The copper silver phase diagram shows that at 782°C the equilibrium microstructure should be a simply alpha phase solid solution.
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