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← ScienceWhich 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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