1. Solid Solution Thermal Equilibrium Diagram
Stephen Burke

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