High-silicon aluminum alloy cylinder sleeve and preparation method thereof

The invention discloses a high-silicon aluminum alloy cylinder sleeve and a preparation method thereof. The high-silicon aluminum alloy cylinder sleeve disclosed by the invention comprises the following alloy elements in percentage by weight: 17-35% of Si, 0.5-5% of Mg, 0.3-1.5% of Ti, 1-2% of Mn, 0.03-0.3% of P or S, 0.3-2.5% of RE, 0.3-0.6% of Fe, 0.02-0.3% of C, and the balance of Al. The high-silicon aluminum alloy cylinder sleeve disclosed by the invention is prepared by comprising the specific steps of smelting, refining, carrying out internal cooling type semi-solid stirring, extruding, casting, carrying out T6 heat treatment, machining, grinding and the like after compounding the above formulae. According to the invention, the phenomena of being too high in centrifugal casting working allowance and easy to cause oxidization inclusion can be effectively avoided; simultaneously, because of adopting a semi-solid rheocasting process, the secondary heating and re-smelting processes can be avoided; the process complexity is reduced; the cost is reduced; and thus, the high-silicon aluminum alloy cylinder sleeve has great application value.