METHOD FOR PREPARING CAST COMPOSITE MATERIALS HAVING AN ALUMINUM-MAGNESIUM MATRIX ALLOY

摘要

A method for preparing a composite material comprises the steps of providing afirst mixture of a molten aluminum-basematrix alloy having at least about 4 percent by weight magnesium, and a massof discontinuous reinforcing particles that are notsoluble in the molten matrix alloy, and mixing the first mixture to wet thematrix alloy to the particles and to distribute the particlesthroughout the volume of the molten matrix alloy. The first matrix alloy isdiluted to reduce the magnesium content of themixture to less than about 4 percent by weight magnesium, to produce a secondmixture, and the second mixture is cast. The secondmixture has at least about 5 volume percent particles, and preferably hasabout 5-25 volume percent particles.