1. The Au-Ni binary phase diagram is given below. Assuming regular solution behaviour for both the solid and liquid solutions: a) Calculate and s. b) Plot the free energy of mixing curves at the melting point for Au, 1000C and 1300C. c) Plot the free energy of mixing curves for the temperature corresponding to where the liquidus and solidus curves just contact one another. d) Plot the phase diagram and compare with the actual phase diagram. AHm(Au) = 12, 600 J/mole at melting point of Au. AHm(Ni) = 17,900 J/mole at melting point of Ni. Temperature C 1500 0 10 20 30 40 50 50 1300- 1100 1064.43C L 955C 18.0 900 (Au,Ni) 700 500- 300- 100 0 10 20 30 Au 60 Atomic Percent Nickel 70 810.3C 41.7 80 40 50 60 Weight Percent Nickel 90 100 1455C 70 80 -0 90 Acti 100 Go to Ni