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The binary phase diagram of metals P and Q is shown in the figure. An alloy X containing 60% P and 40% Q (by weight) is cooled from liquid to solid state. The fractions of solid and liquid (in weight percent) at 1250°C, respectively, will be
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- 68.0% and 32.0%
- 32.0% and 68.0%
- 22.2% and 77.8%
- 77.8% and 22.2%
Correct Option: C
| Mass fraction of liquid, wL = | |
| Cα - Cl |
| wL = | = 0.778 | |
| 68 - 32 |
wL = 77.8%
ws = 1 - wL = 1 - 77.8
ws = 22.2%
