Determine the relative amounts (in terms of volume fractions)for a 15 wt% Sn-85 wt% Pb alloy at 100°C. The densities of tin andlead at 100°C are given as follows: ρSn = 7.29 g/cm3  ρPb = 11.27g/cm3

 

a) What phase(s) is(are) present for an alloy of thiscomposition?

b) What are the compositions for the these two phases?

c) What are the relative amounts (mass fractions) of the twophases?

What are the densities of the these two phases?

Temperature (C) 0 300 200 100 20 32 C 0 0 (Pb) a Liquid a+L 18.3 40 20 Composition = 5 at% Sn Composition = 5 wt% Sn Temperature = 100 C Composition (at % Sn) Temperature = 213 F 60 100 183 C a + Liquid 61.9 80 40 60 Composition (wt% Sn) B+L 80 232 C 97.8 600 500 400 300 200 100 100 (Sn) Temperature (F)