Cast aluminum alloy material with high strength and high yield-tensile ratio, and preparation method thereof

Abstract

The invention discloses a cast aluminum alloy material with high strength and a high yield-tensile ratio. The alloy material is prepared from the chemical components in percentage by weight: 13.0 to 19.0 percent of Zn, 8.0 to 13.0 percent of Si, 1.0 to 3.0 percent of Cu, 0.05 to 0.30 percent of Mg, 0.10 to 0.50 percent of Mn, 0.15 to 0.80 percent of Fe, 0.05 to 0.25 percent of Ti, 0.05 to 0.20 percent of RE, and the balance of aluminum and other impurity elements, wherein the content of the other impurity elements is less than or equal to 0.15 percent.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a cast aluminum alloy material with high strength and high yield ratio and a preparation method thereof. Background technique [0002] With the continuous improvement of automobile fuel efficiency and energy saving and environmental protection requirements, it is imperative to reduce the weight of automobiles. The use of lightweight and high-strength materials has become one of the main lightweight methods in the automotive industry, and aluminum alloys have become the first choice for automotive lightweight materials. According to statistics, aluminum alloy castings account for about 77% of the aluminum used in automobiles, of which die castings account for 50% of the aluminum used in automobiles. Typical components include engine block, cylinder head, clutch housing, oil pan, engine bracket, etc. Since die castings cannot be strengthened by heat treatment, and there are problems...

AI Technical Summary

Problems solved by technology

Since die castings cannot be strengthened by heat treatment, and there are problems of shrinkage porosity and shrinkage cavities, the performance of die castings is generally not high, and it cannot meet the requirements of further weight reduction through structural optimization design. It is urgent to develop a self-strengthening high performance without heat treatment. Die-casting aluminum alloy materials, which are necessary for the development of automobiles and mobile communications with high lightweight requirements

[0003] At present, there are only Al-Zn series of self-strengthening cast aluminum alloys. This series of alloys has the characteristics of quenching structure in the casting state, and high strength can be obtained without heat treatment. For example, the aluminum alloy grades in my country are ZL401 and ZL402 alloys, which have Good casting performance, cutting performance, welding performance and dimensional stability can avoid deformation and dimensional changes caused by quenching process, but hot cracking occurs, and the strength is not high, which hinders the application of alloys

Images