OLFSTLON 1 [ 5} marks] The binary Ag-Cu phase diagram is given in Figure 1 below. Answer the following questions: a) An alloy consisting of 80% Cu and 20%sA is cooled under equilibrium conditions. i. Is this alloy hypo- or hypereutectic? |1 mark| ii. What are the liquidus and solidus temperatures of this alloy? [2 marks] iii. Devermine which phase(s) are present in the strocture at a tempenture of 800 "C. Also determine the chemical conposition of each phase, and the umount of each phase present in the alloy at this temperature. [8 marks] iv. Calculate the total amounts of eunectic and eutectic in the microstructure at a temperature just below 780C(780C47) [2 marks] v. Calculate the total amounts of calectic in the microstructure at a temperature just below 780C(780C7) [1 mark] vi. Sketch and label the equilibrium free energy diagrams for the equilibrium phases at temperatures of 900C, Tou and Ten - T where T=0.1C. [9 marks] b) Calculate the \% eutectic conponent in a Cu-Ag alloy containing 8% copper for the following situations: (i) Equilibrium solidification and (ii) No diffusion in the solid, complete mixing in the liguid and local equilibrium at c) Comsider an alloy containing 5% Ag which has solidified under condition b (iii). Plot the schenstic solute consentration profile assuming un-directional solidification. [6 marks] d) Devermine the chemical compositions (silver contemts) containing the following microstructural components after cooling at a temperature just slightly below 7sorC (7800C7) : i. 50% pro-eutectic a [2 marks| ii. 5% pro-eutectic . iii. 15% calectic (hypereutectic composition). iv. 60% lamellar strocture which is total amounts of eulectic a and curtectic (hypocutectic composition). [2 marlss| v. equal amounts of pro-eutectic alpha and curectic alpha |6 marks|