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← ScienceWhich 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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