Phase analysis of Sn Pb phase diagram

1. Group Members:
 Salman Razzaq 12-IE-01
 Fahad Hussain 12-IE-04
 Sadam Hussain 12-IE-05

2. Phase Analysis
from Sn-Pb
Phase
Diagram

3. Question:
 For a 40-60 Pb-Sn solder, find ;
a) Phase present, Composition of phases
and Weight fraction at 200˚C
b) Phase present, Composition of phases
and Weight fraction at 100˚C

4. Phase Diagram:

5. Calculations (For 200˚C):
 Liquid phase
 60 wt% of Sn and 40 wt% of Pb
 Weight fraction of liquid phase is 1

6. Phase Diagram:

7. Calculations (For 100˚C):
 +β phase
 phase contains 5 wt% of Sn and 95 wt%
of Pb
 β phase contains 98 wt% of Sn and 2 wt%
of Pb.

8.  Weight fraction by Lever Rule;
=
98−60
98−5
= 0.41
=
60−5
98−5
= 0.59
+ = 0.41+0.59 = 1