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← ScienceWhich outcome occurs when dislocations concentrate near grain boundaries of a metal lattice exposed to cyclic stress?
A)Reduced fatigue crack nucleation
B)Increased susceptibility to creep✓
C)Enhanced electrical conductivity locally
D)Higher thermal expansion coefficient
💡 Explanation
Creep susceptibility increases, because dislocation pile-up weakens grain boundary cohesion via vacancy diffusion through Coble creep; therefore microvoids form, rather than fatigue resistance, which would require improved grain boundary strength characteristics.
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