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Which phenomenon promotes crystal grain growth during annealing?

A)Ostwald ripening minimizes interfacial energy
B)Hall–Petch strengthening impedes dislocation motion
C)Martensitic transformation increases material hardness
D)Grain boundary sliding increases high-temperature creep

💡 Explanation

Thermal activation facilitates larger grains growing at the expense of smaller grains via Ostwald ripening; this reduces the system's overall interfacial energy because larger grains have a lower surface area to volume ratio, therefore it grows, rather than others which halt grain growth under annealing.

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