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← ScienceWhich outcome results in steel bridge girders when increased grain boundary surface area limits dislocation movement?
A)Enhanced material yield strength✓
B)Greater thermal expansion rate
C)Increased corrosion susceptibility
D)Reduced fatigue crack propagation
💡 Explanation
The yield strength increases because grain boundary strengthening impedes dislocation glide, thereby requiring greater stress to cause plastic deformation. Therefore, the material becomes stronger, rather than the corrosion or expansion because those are different physical effects entirely.
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