Parent bore materials of copper-containing hypereutectic AI-Si alloys have been tried with limited success. Funda- Mentally the reason for this technology limitation is Because copper-containing hypereutectic aluminum-sili- Con alloys precipitate the copper-phase late in the solidifi- Cation process and hinder the feeding process to make Sound castings. As a result, the copper-containing Hypereutectic AI-Si alloys that have been used in the past As parent bore materials have been compromises of low Siicon content, which has translated into low wear resis- Tances and the need for special surface treatment.
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