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Which risk increases when aluminum casting chills too rapidly?

A)Elevated gas porosity within the metal
B)Increased alloy segregation throughout the casting
C)Reduced oxidation rate along mold interface
D)Higher crystalline structure within the solid

💡 Explanation

Gas solubility decreases notably as molten aluminum rapidly cools to its solid phase; therefore, hydrogen dissolved in the melt forms gas bubbles, increasing gas porosity within the casting, rather than allowing uniform distribution throughout the solidifying metal.

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