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# 7 Given here are the solidus and liquidus tempera- tures for the coppergold system. Construct the A phase diagram for this system and label each...

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10.7 Given here are the solidus and liquidus tempera-tures for the copper—gold system. Construct the Aphase diagram for this system and label each region. 5"" ' °f 1 Plot the phase diagram at copper-gold system. Composition Solidus Liquidus 1“”(wt% Au) Temperature (‘6') Temperature (°C) :20 1085 1085 ‘ U M _ I20 1019 1042 5 1:: i Mom“.40 972 996 g :: :=l| hunch: cave-me60 934 946 m Ell80 911 911 :3 .7.90 928 942 15°95 974 984 a is for solid state.100 1064 1064 L is lor Liquid state. b. Based on your result in part a, what is the composition of the alloy that meltscongruently? What is the melting temperature for this composition? Calculate the degree of freedom for the condition in part b assuming ﬁxedpressure. (1. Calculate the degree of freedom for each region you have label in part a assumingﬁxed pressure. Based on the phase diagram you have drawn in part a, cite the phase(s) presentand calculate/estimate the composition and the relative amounts (in terms of massfractions) of the phase(s) for an overall composition of 40 wt% Au at each of thefollowing temperatures: 900°C, 980°C, and 1050°C. f. For a Cu-Au alloy of composition 40 wt% Au, draw the schematics of themicrostructures that would arise from equilibrium and non-equilibrium cooling.Estimate compositions if any part of the microstructure has composition differentthan the overall composition of 40 wt% Au based on the phase diagram you havedrawn.