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answer as group 4
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The equilibrium phase diagram of Cu-Ag alloy system is given below. 1- Answer the following for an alloy that contains W% Ag (Wdiffers according to group no. as per table below), Group no. 1 2 3 4 5 6 W. (wt.% Ag) 5 25 50 80 90 95 (a) Draw schematically the cooling curve and show temperatures arrests (temperature values at which phase changes occur). (b) Conduct a complete phase analysis as per the table below. (c) For groups (173): Find the relative amount (wt.%) of Eut. At 400*C. For groups (4 →6): Find the relative amount (wt.%) of Beut.at 400°C. 2- Find the alloy composition (X, in wt.% Ag) that contains eutectic phase at temperature 780°C-AT with amounts given as per table below: Group no. 1 2 3 4 5 6 Amount of eutectic phase (wt%) 52 65 18 27 30 43 1100 °C 1084.50 1000 L 961.93) 900 + 800 LUB R Temperature 780° B 7.9 719 91.2 700 600 +B 500 400 Cu 10 20 30 70 80 90 Ag 40 50 60 Weight percent silver
Answer sheet 1-(a) e.g. For an alloy X=60% 1100 OS te * 2D Temperature 710 0131 elect kd time NO 1-(b) Weight Temperature Phases Wt.% Ag (show on phase diagram) Phase amount (Show the calculations) Microstructure T + AT Τι - ΔΤ CE e.g 30 a TE + AT e.g. 43 ө 6 TE-AT Τ, + ΔΤ TS - AT 500°C 1- (c) At TE + AT → Apro =..... At 400°C → A Total Thus, a Eut. = A Total - Apro 2- To solve this part students have to assume an alloy composition (X.) and apply the lever rule at T = 780°C - AT