Given the following phase diagram for a copper-silver alloy of composition 25 wt% Ag- 75 wt% Cu and at 775C Temperature (C) 1200 A 0 20 20 1000 Solidus Composition (at% Ag) 40 Liquidus Liquid 60 80 80 100 2200 2000 1800 F 1600 a+L 800 B 779C (Tg) 8.0 (C. g) 71.9 (CH) 912 1400 (C) 1200 600 400 200 Solvus 1000 800 600 H 20 40 60 80 100 (Cu) Composition (wt% Ag) (Ag) (a) Determine the mass fractions of a and phases [3] (b) Determine the mass fractions of primary a and eutectic micro-constituents. [3] (c) Determine the mass fraction of eutectic a 131 Temperature (F)