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← ScienceWhich consequence occurs when dislocations impede slip planes' movement within crystalline alumina?
A)Increased material strength and hardness✓
B)Enhanced electrical conductivity pathway
C)Decreased thermal expansion coefficient
D)Reduced optical transparency, enhanced opacity
💡 Explanation
Increased strength occurs because dislocation pile-up causes strain hardening, increasing resistance to deformation via the Frank-Read source mechanism. Therefore, alumina becomes harder rather than more conductive, because electrons do not flow freely within the disrupted lattice.
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