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← ScienceWhich outcome occurs when rapid quenching increases vacancy concentration in a metal subjected to diffusion?
A)Enhanced diffusion coefficient at grain boundaries✓
B)Increased ductility at elevated temperatures
C)Decreased electrical conductivity within grains
D)Reduced creep resistance under sustained load
💡 Explanation
Increased vacancies after rapid quenching facilitate diffusion via Vacancy Diffusion. Therefore, diffusion rates are heightened along grain boundaries offering preferential, disordered sites for atomic movement, rather than increased ductility or altered electrical/creep properties within the crystalline grains.
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