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The present paper reports on brittle spall fracture of aluminum foil and sheet at room temperature. It was found that fairly rapid fracture takes place upon contact with liquid Ga83In17 alloy in the presence of moisture. A rapid increase in temperature was observed during the reaction. Observation in a different atmosphere clarified that moisture has a strong influence on the present fracture process, although the phenomena are basically correlated to embrittlement by liquid Ga83In17 alloy penetrating into the grain boundaries of aluminum polycrystals. The fine debris obtained through the spall fracture was identified as metallic aluminum, neither bulk oxides nor hydroxides.

Spall Fracture of Metallic Aluminum Induced by Penetration of Liquid Gallium-Indium Alloy and Moisture at Room Temperature