The contact of SiC particles with molten Al-Si-Cu alloy may result in Al
4C
3 formation in the electron beam remelting of aluminum alloy matrix composites, depending upon the matrix composition. It is known that the formation of Al
4C
3 is affected by melt temperature, holding time and silicon content in the matrices, and also high silicon levels are required to prevent the Al
4C
3 formation. However, the influence of copper content on the Al
4C
3 formation has not been clear. Therefore, the influence of silicon and copper content on the Al
4C
3 formation was studied, and the following results were obtained: high copper and low silicon content promote the Al
4C
3 formation in electron beam remelting. The formed plate-like Al
4C
3 prevents the bead surface from smoothing.
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