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← ScienceWhich outcome results when rapid cooling induces substantial polycrystallinity?
A)Reduced mean free path length✓
B)Increased average grain size
C)Significant plastic deformation resistance
D)Enhanced single crystal domain purity
💡 Explanation
Rapid cooling creates many nucleation sites causing significantly smaller crystal grains and thus polycrystallinity. Because the density of grain boundaries strongly increases in the material under conditions of rapid cooling, the mean free path length decreases; therefore electrons scatter more rather than conduct efficiently if grains are purer or larger.
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