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← ScienceWhich consequence results when dislocations impede crack propagation within a metal lattice?
A)Increased material yield strength✓
B)Reduced thermal expansion rate
C)Enhanced electrical conductivity
D)Diminished corrosion resistance
💡 Explanation
Increased yield strength occurs because strain hardening via dislocation pile-up concentrates stress; therefore, material resists plastic deformation rather than continuing crack growth. Reduced thermal expansion relates to atomic bonding, differing from dislocation mechanics. Electrical conductivity depends primarily on available electron density.
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