In order to develop high strength new casting aluminum alloys, a relation between microstructureand strength in multiphase eutectic alloys was analyzed from points of view of both theoreticaland experimental approaches. Initially, microstructure of multiphase eutectics was discussed.Secondary, an AI-Ce-Ni multiphase eutectic alloy was cast and examined by compression test.Finally, strengthening mechanism of the AI-Ce-Ni multiphase eutectic alloy was analyzed. Theresults obtained are as follows. Even in the conventional foundry technique the multiphase eutecticalloy has large amounts of aluminide particles being very fine because of the independentlycrystal nucleation. The AI-Ce-Ni multiphase eutectic alloy showed 30~200% higher strengththan commercial casting aluminum alloys. The strength consisted of strength of the aluminideparticle itself, internal stress due to dislocations in Al phase and also Orowan stress incrementsdue to the fine aluminide particles. This indicates the possibility in principal to develop new castingaluminum alloys.
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