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Which consequence results when excessive vacancies concentrate within a metal's lattice?

A)Increased grain boundary pinning
B)Elevated critical shear stress
C)Enhanced ductile fracture initiation
D)Decreased thermal conductivity

💡 Explanation

Enhanced ductile fracture initiates at vacancy clusters because the mechanism of vacancy coalescence reduces atomic cohesion, therefore weakening the local material rather than increasing its strength; vacancies locally increase strain.

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