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← ScienceWhich consequence results when dislocations concentrate at grain boundaries in polycrystalline metal?
A)Decreased material yield strength✓
B)Amplified Hall Effect voltage
C)Increased thermal conductivity magnitude
D)Accelerated rate of electron tunneling
💡 Explanation
A higher concentration of dislocations results in increased localized stress, initiating plastic deformation through the mechanism of slip because dislocations more easily propagate. Therefore, yielding occurs at lower applied stress, rather than thermal or electrical effects.
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