A kind of low-cost high extrudability free-cutting bismuth-containing aluminum alloy and preparation method thereof

Abstract

The invention discloses a low-cost high-extrusion-property free-cutting bismuth-contained aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 2.35%-2.65% of Cu, 0.35%-0.75% of Si, 0.32%-0.47% of Mn, 0.37%-0.49% of Mg, 0.35%-0.65% of Fe, 0.10%-0.15% of Cr, 0.05%-0.10% of Ti, 0.57%-0.67% of Bi, 0.05%-0.15% of Zr, 0.05%-0.15% of Sc, 0.05%-0.15% of Sn and the balance Al and other inevitable impurities, wherein the content of each single other inevitable impurity is smaller than or equal to 0.05%, and the total content is smaller than or equal to 0.15%. By meansof the low-cost high-extrusion-property free-cutting bismuth-contained aluminum alloy and the preparation method, the component composition of aluminum alloy elements is optimized, and therefore highstrength and high plasticity are achieved for the aluminum alloy, and the requirement of high-speed lathes for turning is met; and by optimizing the process, the process flow can be simple, and the prepared aluminum alloy has the beneficial effects of being low in cost, high in extrusion property, environment-friendly and the like while having the excellent comprehensive mechanical property and the free-cutting performance.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and in particular relates to a low-cost, high-extrudability, easy-cutting bismuth-containing aluminum alloy and a preparation method thereof. Background technique [0002] The free-cutting aluminum alloy has a history of more than 70 years, which is achieved by adding a small amount of Pb and Bi elements to the 2XXX and 6XXX series aluminum alloys. The free-cutting aluminum alloy can be used for master cylinder brake pistons, connector transfer valves, AC Inflatable valves and parts, automobiles, hydraulic equipment and pressure parts in the electronic industry, and instrumentation industries require precision aluminum alloy structural parts with high surface finish, which has broad application prospects. my country is the main producer of traditional free-cutting aluminum alloys. Free-cutting aluminum alloys in foreign industrial countries are mainly imported from my country, an...

AI Technical Summary

Problems solved by technology

However, the use of Pb is gradually banned and replaced, and the existing Al-Cu-Mg-Mn series medium-strength aluminum alloys and their preparation methods still need to be improved and developed.

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