Q6The eutectic transformation of Cu-Ag system is given below -
008 L70wt%Ag) a10wt%Ag+90wt%Ag
The melting point of Cu and Ag is 1200C and 1000C respectively.Assume, at room temperature 20C the solid solubility of Ag in Cu and Cu in Ag is 2 wt% and 5% respectively.Further assume that the solidus, liquidus and solvus lines are straight line and slope remain unchanged in the intermediate temperature.
(a)Draw the phase diagram of Cu-Ag system along with temperature and composition.
[5]
(bMark all the phases, and the solidus, liquidus and solvus lines on the diagram.
[5]
cFind out the fraction of primary and eutectic when the Cu-Ag alloy consisting of 50wt% of Ag is cooled down from liquid state to a temperature just below the eutectic temperature [5]
d Show the microstructural evolution of an Cu-Ag alloy consists of 8wt % Ag cools down very slowly from 1200Cto20C [5]