Question

In a lead Tin(Pb-Sn) system the following invariant reaction was observed at a temperature of 183°C (19% Sn) +(97% Sn)=Liquid (62% Sn). Liquid melting point of Lead and Tin are 327°C and 232°C i) Draw the phase diagram ii) Calculate the fraction of total a in the alloy containing 80% at 182°C

Answer 1

Part i

Part ii

$W_{\alpha}=\frac{C_1-C_0}{C_1-C_2}=\frac{97.8-80}{97.8-18.3}=0.22$

$W_{\beta}=1-W_{\beta}=1-0.22=0.78$