For the alloy Mg-45 wt% Pb alloy at 500 C, what is the percentage of the liquid phase? For the alloy Mg-45 wt % Pb alloy at 500 C, what is the percentage of the Liquid phase?Composition (at% Pb)1020304070 100700L.1200600Mg2PbMa +L1000500a800400L.+.+Mg2Pb600300400200+ Mg PbaB +200100Mg2PbMg2Pb20406080100(Mg)Composition (wt% Pb)(Pb)Temperature (°C)Temperature (°F)

To obtain the percentage of the liquid phase in an alloy composition at a certain temperature can be obtained using the Lever rule which is as- %L=C-CsCL-Cs where C is the composition of the alloy at that temperature Cs is the composition of the alloy at the solidus line at that temperature CL is the composition of the alloy at the liquidus line at that temperature The percentage of the solid in the alloy composition can also be computed using the same above law as- %S=CL-CCL-CsNow, from the figure let us locate the composition of the alloy at the liquidus and the solidus lines at 500°C as- The composition of the alloy at the liquidus line be, CL=61% The composition of the alloy at the solidus line be, Cs=34% The composition of the alloy at the given temperature be, C=45% Let us now use the lever rule to calculate the liquid phase percentage in the alloy as- %L=C-CsCL-Cs%L=45-3461-34%L=0.4074%L=40.74% Thus, the liquid phase percentage in the alloy is 40.74%The percentage of the liquid phase in the alloy is 40.74%.