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← ScienceWhich outcome occurs when increasing magnesium content past the solubility limit in aluminum alloys?
A)Precipitation hardening strengthens the alloy✓
B)Dendritic growth refines microstructures
C)Grain boundary sliding increases ductility
D)Solid solution softening decreases yield
💡 Explanation
Increasing Mg in Al beyond its limit causes precipitation hardening because second-phase particles form, hindering dislocation motion. Therefore, the alloy’s yield strength increases rather than decreases, and microstructure isn't refined directly.
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