Aluminum-silicon-magnesium casted aluminum alloy and casting process thereof

Abstract

The invention relates to aluminum-silicon-magnesium casted aluminum alloy and a casting process thereof. The aluminum alloy contains the following elements by mass: silicon 6.5 to 7.5, magnesium 0.40 to 0.60, titanium 0.10 to 0.30, strontium 0.01 to 0.03, iron no more than 0.20, copper no more than 0.10, zinc no more than 0.20, manganese no more than 0.10, beryllium no more than 0.01 and vanadium no more than 0.20, with the balance being aluminum. The casting process for the aluminum alloy comprises the following steps: putting A356.2 aluminum ingots in a furnace for melting; adding a modification material for refining; standing the product obtained in the previous step for a predetermined time and carrying out casting; sequentially carrying out solid solution, cooling, transfer and aging treatment. The invention enables the problems of low strength and elongation percentage of aluminum-silicon alloy and poor casting performance and corrosion resistance of aluminum-copper alloy and aluminum-zinc alloy to be overcome and tensile strength, toughness and casting performance of the aluminum alloy to be improved, and enables the aluminum alloy to have the advantages of low cost and good corrosion resistance.

Description

Technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to an aluminum-silicon-magnesium-based cast aluminum alloy with high tensile strength and comprehensive mechanical properties of elongation and a casting process. Background technique [0002] As a traditional metal material, cast aluminum alloy has the characteristics of low specific gravity, high specific strength, easy processing, low cost, good heat dissipation and corrosion resistance, flexible and simple production parts, and easy mass production. It is widely used in aviation, aerospace, Automobile, machinery and other industries. With the development of modern industry, there is an increasing demand for cast aluminum alloys, especially for cast aluminum alloys with high tensile strength and elongation comprehensive mechanical properties, excellent corrosion resistance and low cost. After decades of development, high-strength cast aluminum alloy has formed a comple...

AI Technical Summary

Problems solved by technology

However, most of the aluminum alloys after the above treatment are difficult to stably achieve a tensile strength above 300Mpa, and the elongation is also low.

It is also possible to refine the grains by adding rare earth and other elements, or to increase the extrusion process on this basis to improve the casting performance and mechanical properties of aluminum alloys, but this also makes the casting process of aluminum alloys more complicated and the cost is higher.

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