CASTABLE HIGH TEMPERATURE ALUMINUM ALLOY

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PROBLEM TO BE SOLVED : To provide an aluminum alloy which can maintain strength even at elevated temperatures and can be widely suited to high temperature uses. SOLUTION : The aluminum-rare earth alloy is dispersion-strengthened and castable. In one example, the aluminum alloy includes approximately 1.0 to 20.0% by weight of gadolinium, approximately 0.1 to 10.0% total by weight of other rare earth elements including ytterbium, erbium or yttrium, and approximately 0.1 to 15.0% total by weight of minute alloy elements. In another example, the aluminum alloy contains approximately 1.0 to 20% by weight of ytterbium, approximately 0.1 to 10.0% total weight of other rare earth elements including gadolinium, erbium or yttrium, and approximately 0.1 to 10.0% total by weight of minute alloy elements. After casting, the aluminum alloy is solidified and cooled. During solidification, the rare earth elements are excluded from the aluminum matrix, forming eutectic rare earth element-containing dispersoids that strengthen the aluminum matrix.