Problem 4 (Phase Diagram ) : Magnesium-Lead phase diagram is shown in the figure below: a) Identify the intermetallic solid compound. Provide the composition (in wt% Pb) and range of temperatures in which the compound is formed. b) What is a eutectic reaction? Identify all the eutectic points in the diagram and give the corresponding eutectic composition (CE) and temperature (TE). c) Consider a mixture consisting of 10 wt% Pb at room temperature (T=20 degree C). To what temperature should this mixture be heated to dissolve all the Pb into Mg? a)8090Pb Solution a)the intermetallic compound in the phase diagram is Mg 2 Pb it exists at the composition of 19wt % Mg ,81 wt% Pb it lies in the range between 0 0 C to a little over 549.5 0 C b) there are two eutectic reaction here one is Comp. Temp. Type of Reaction Reaction (on cooling) (i) 0wt%Pb 640 .