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← ScienceWhich consequence results when dislocations impede motion in metal polycrystals?
A)Increased material yield strength✓
B)Decreased electrical conductivity
C)Elevated thermal expansion rate
D)Reduced susceptibility to corrosion
💡 Explanation
Increased yield strength occurs because dislocation motion is fundamental to plastic deformation; pinning via **strain hardening** prevents slip. Therefore, material resists deformation more effectively rather than exhibiting increased conductivity or thermal expansion under similar stress.
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