The microstructure of a Cu-Ag alloy at 779°C consists of primary a (with mass fraction of 0.73) and eutectic structure (with mass fraction of 0.27). Determine the composition of this alloy. Temperature (°C) 1200 A 1000 @ 800 600 400 200 R C (Cu) B 8.0 (C₂₂) -Solidus Solvus 20 a + L Composition (at% Ag) 40 -Liquidus 779°C (T₂) 40 a B Liquid 60 Composition (wt% Ag) 60 E 71.9 (C₂) 8 80 B+L 91.2 (Cpg) G 100 IN T T H 2200 2000 1800 F 1600 1400 1200 1000 800 600 400 100 (Ag) Temperature (°F)

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