Discussion
Put the events in order as a non-eutectic binary melt is cooled.
1. The eutectic solidifies at an arrest 2. The melt cools with no phase change 3. One solid begins to crystallise at a break in the curve 4. The remaining liquid moves toward the eutectic composition
Answer: A
Cooling proceeds smoothly until the liquidus is reached, one component then deposits and drives the liquid along the liquidus, and the residue finally freezes as eutectic. The cooling curve records each stage as a break or an arrest.
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