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Which outcome from cyclic stress occurs when dislocations move through aluminum crystal grains?

A)Significant material work-hardening
B)Elevated resonant frequency
C)Enhanced passive oxide layer
D)Diminished galvanic corrosion rate

💡 Explanation

Cyclic stress causes work-hardening because dislocation pile-up hinders further plastic deformation; the mechanism is dislocation tangling. Therefore work-hardening occurs rather than increased resonant frequency because that would involve vibration, under different conditions.

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