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← ScienceWhich outcome occurs when cyclic heat treatment strengthens aluminum?
A)Grain boundary mobility decreases rapidly✓
B)Equiaxed grain growth becomes unpredictable
C)Superlattices dissolve at high strain
D)Dendritic segregation exceeds equilibrium limits
💡 Explanation
Grain boundary mobility reduces swiftly at elevated annealing temperatures by the mechanism of precipitate pinning. Because precipitates hinder dislocation movement, the ultimate yield strength is raised; therefore, strain hardening occurs rather than boundary movement.
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