A lead-tin alloy of composition 80 wt%Sn-20 wt% Pb is slowly cooled from 300 oC to 182 oC, do the following:
(i) Draw schematically the microstructure of such an alloy.
(ii) Determine the mass fraction of ? and ? phases.
(iii) Determine the mass fraction of primary ? and eutectic microconstituents.
(iv) Determine the mass fraction of ? phase in the eutectic microconstituent.