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← ScienceWhich outcome occurs when applying stress near polymorphic crystal grain boundaries?
A)Increased susceptibility to intergranular corrosion✓
B)Enhanced second-phase particle precipitation
C)Increased ductile fracture resistance overall
D)Improved fatigue life at higher temperatures
💡 Explanation
Applying stress promotes galvanic action because differential grain boundary energy increases the electromotive force through vacancy aggregation, weakening the metal; therefore, corrosion increases, rather than the metallic strength increasing at grain interfaces.
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