High-performance aluminum alloy added with rare earth element and preparation method of high-performance aluminum alloy

Abstract

The invention discloses a high-performance aluminum alloy added with a rare earth element. The high-performance aluminum alloy is characterized by being prepared from, by mass percent, 6.5%-7% of silicon, 0.2%-0.25% of magnesium, 0.25%-0.3% of iron, 0.01%-0.012% of boron, 0.3%-0.4% of cerium, 0.1%-0.2% of zinc, 45%-50% of waste aluminum intermediate alloy powder and the balance aluminum. Alloy compositions are optimized, the rare earth element cerium is added, and therefore the tensile strength of the alloy can be improved; and a scientific and reasonable heat treatment technology is adopted, and therefore the mechanical property, especially the high-temperature mechanical property, of the alloy can be improved. The stability of a strengthening phase can be improved, precipitation and growth of the strengthening phase can be stopped, grains can be refined, cracks can be avoided, no air hole exists inside, and the product formability and the rate of finished products are improved. The prepared aluminum alloy has the beneficial effects of being high in performance, good in weldability and formability and the like, and can be used for manufacturing an engine air cylinder cover.

Description

technical field [0001] The invention relates to the field of aluminum alloys, in particular to a high-performance aluminum alloy added with rare earth elements and a preparation method thereof. Background technique [0002] Cast aluminum alloy has a series of advantages such as small specific volume, high strength, good casting formability and processing performance, small expansion coefficient and good fluidity, and is widely used in automobiles, aviation, aerospace and home appliances and other industries. At present, most of the car engine cylinder blocks and cylinder heads at home and abroad have basically been produced with high-strength aluminum alloys. The all-aluminum alloy material reduces the weight of the body and at the same time enhances the heat dissipation effect of the engine, improves the working efficiency of the engine, and shortens the service life. longer. From the perspective of fuel saving, the advantages of cast aluminum engines in terms of fuel savi...

AI Technical Summary

Problems solved by technology

Although the traditional grades of aluminum-silicon alloys can already meet the requirements in terms of general performance, when the parts are in a complex stress state, such as under high temperature, the grain structure of the material is coarse and the composition is segregated, which makes the performance of the aluminum alloy cylinder head not good. Stable, prone to thermal fatigue, cracking and other problems, does not meet the needs of supercharged engines

For example, although the alloy composition of ZL101 is simple, its mechanical properties are not high, so it can only be used for parts with low strength requirements; ZL104 has relatively poor heat resistance, so it has important application significance for the research and development of cast aluminum alloys.

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