| 摘要 |
An extruded aluminum alloy improved especially in wear resistance and cuttability and comprising 12 to 30% of Si and 0.3 to 7.0% of Cu, with or without 0.3 to 2.0% of Mg, the balance being substantially aluminum. In this alloy, primary Si crystals 40 to 80 microns in particle size occupy at least 60% of the area occupied by all the primary Si crystals in the aluminum matrix, and eutectic Si crystals up to 10 microns in particle size occupy at least 60% of the area occupied by all the eutectic Si crystals in the matrix. The primary and eutectic Si crystals are uniformly dispersed throughout the matrix. A process for preparing the extruded aluminum alloy is also disclosed.
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