Solid Solution Thermal
Equilibrium Diagram
Stephen Burke
% of metal
B in alloy
0
10
20
30
40
50
60
70
80
90
100
Start of
Solidification
270
332
400
445
492
524
552
580
603
618
630
End of
Solidification
270
272
280
300
318
340
368
404
449
510
630
Temperature °C
650
630
618
603 600
580
552 550
524
510 500
492
449
445 450
Label as A
A
404
400 400
368
350
340
332
318
300 300
280
272
270
Label as B
B
Label as C
C
For the alloy of 50% B
determine from the diagram
the ratio of phases at 400°C.
250
200
150
Draw Y-axis to represent Temperature
Draw line across from 400 °C
Draw X-axis to represent Composition
Draw line up from 50%
30
19
100
50
10
20
AB
= Weight of Solid = 30
BC
Weight of Liquid
19
30
40
50
% Metal B
60
70
80
90
100