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← ScienceWhich risk increases significantly as temperature cycles drive stress within a polycrystalline metal lattice?
A)Enhanced electron mobility
B)Creep void nucleation✓
C)Increased thermal diffusion
D)Improved corrosion resistance
💡 Explanation
Cycling temperatures cause repeated expansion and contraction in grain boundaries, initializing creep void nucleation; because of coefficient differences. This stress aggregation leads to material failure, rather than enhanced electron mobility or corrosion resistance at these boundaries; therefore promoting voids.
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