High-strength cast aluminum-silicon alloy part with complex shape for automobile and preparation method of high-strength cast aluminum-silicon alloy part

Abstract

The invention discloses a high-strength cast aluminum-silicon alloy part with a complex shape for an automobile and a preparation method, and belongs to the technical field of aluminum alloy. The aluminum alloy comprises the following components in percentage by weight: 5.5 to 7.8 percent of Si, 1.80 to 2.98 percent of Cu, 0.4 to 0.8 percent of Mg, 0.04 to 0.16 percent of Ti, 0.04 to 0.16 percent of Zr, 0.08 to 0.15 percent of V, 0.15 to 0.45 percent of Sc, and the balance of Al and inevitable impurities. The preparation method comprises the steps of burdening and preheating, smelting, molten aluminum treatment, casting, solid solution quenching and aging treatment. According to the high-strength cast aluminum-silicon alloy part with the complex shape for the automobile, the part with the complex shape for the automobile can be prepared, the comprehensive mechanical property at the room temperature and 300 DEG C is very excellent, and the organization structure of a casting with the complex shape obtained after heat treatment is also superior to that of an existing automobile light-weight part.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and relates to a high-strength cast aluminum-silicon alloy part of a complex shape for an automobile and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, the energy problem is becoming more and more urgent, and the environmental problems caused by automobiles are also becoming more and more serious. The lightweight of auto parts is an effective way to alleviate the energy crisis, reduce greenhouse gas emissions, and reduce environmental pollution, and it is also the future development direction of automobiles. [0003] The core basis for the lightweight of auto parts is the lightweight of auto parts materials. At present, the lightweight materials of automobiles mainly use aluminum alloy instead of steel. However, due to the complex shape of some auto parts, such as cylinder blocks, cylinder heads and other parts, correspo...

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Problems solved by technology

[0010] The technical problem solved by the present invention is that most of the aluminum alloy materials in the prior art have unsatisfactory mechanical properties at high temperatures, high cost and high content of alloying elements; and the shape of the cast aluminum alloy parts cannot be complicated, and the heat treatment is mainly aimed at Rolling plates instead of casting complex-shaped parts, the mechanical properties at room temperature and high-temperature mechanical properties are far apart, and cannot meet the performance requirements of high-strength cast aluminum-silicon alloy parts with complex shapes for automobiles

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