Question in proper order:
Consider a solder containing 70%Pb 30%Sn, determine:
a. If the alloy is hypo- or hypereutectic
b. the composition of the first solid to form during solidification
c. the amount and composition of each phase at 1840 C
d. the amount and composition of each phase at 1820 C
e. the amount and composition of each phase at 500 C f. the eutectic composition and temperature ( 35 points)
Answer and explanation:
The Phase Diagram of Pb-Sn Alloy is given in the attached image
a. Pb-Sn alloy will have eutectic composition between 61.9% and 97.5% Sn, so the Pb-70%Sn alloy will have eutectic composition as it has 70%Sn
