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Which outcome destabilizes solid crystal structure when impurities aggregate?

A)Increased dislocation nucleation rate
B)Decreased grain boundary mobility
C)Enhanced solid-state diffusion
D)Reduced ductile-brittle transition

💡 Explanation

Increased dislocation nucleation occurs, because stress concentration increases at impurity clusters, causing dislocations to form by the Frank-Read mechanism. Therefore, crystal plasticity is promoted and yield strength decreases, rather than being strengthened without this process.

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