material engineering- cooling rate
Two metals A and B have melting points of 400°c and 700°c respectively. Cooling curves were plotted for several binary alloys of A and B and the following data was obtained:
| B% | 10 | 30 | 50 | 70 | 90 |
| First arrest pt | 360 | 250 | 400 | 530 | 650 |
| 2nd arrest pt | 250 | - | 250 | 250 | 400 |
On squared paper draw accurately the equilibrium diagram for the binary alloy system of A and B, and fully label this. For an alloy containing 60% B calculate:
a) The temperature at which solidification begins.
b) The ratio of phases present at 300°c
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