The copper-silver phase diagram is shown in Figure 11-30. Copper has a higher melting point than silver. Refer to the silver-rich solid phase as gamma (γ) and the copper-rich solid phase as delta (δ). Denote the liquid as L.

Figure 11-30 A phase diagram for elements A and B (for Problem 11-17).
(a) For an overall composition of 60% B (40% A) at a temperature of 800 ËšC, what are the compositions and amounts of the phases present?
(b) For an overall composition of 30% B (70% A) at a temperature of 1000 ËšC, what are the compositions and amounts of the phases present?
(c) Draw a schematic diagram illustrating the final microstructure of a material with a composition of 50% B (50% A) cooled to 200 ËšC from the liquid state. Label each phase present.

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1200 1100 1000 900 800 700 600 500 400 300 200 2 0 10 20 30 40 50 60 70 80 90 100 Composition % B Pure A Pure B