Question
The binary phase diagram of metals P and Q is shown in the figure. An alloy X containing60% P and 40% Q (by weight) is cooled from liquid to solid state. The fractions of solid andliquid (in weight percent) at 1250 °C, respectively, will be
Options :
77.8% and 22.2%
22.2% and 77.8%
68.0% and 32.0%
32.0% and 68.0%
Answer :
22.2% and 77.8%
Solution :
According to lever rule:
Amount of solid phase = (40 - 32) x 100/ (68 - 32) = 22.2%
Amount of liquid phase = (68 - 40) x 100 / (68 - 32) = 77.8%
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