Preparation technology of high strength rare earth aluminum alloy

Abstract

The invention discloses a preparation technology of high strength rare earth aluminum alloy. The main element compositions used for alloying are characterized by comprising, by mass percentage, the following parts of 0.7%-0.9% of magnesium, 0.4%-0.6% of silicon, 0.2%-0.3% of scandium, 0.15%-0.2% of zirconium, and the test compositions of aluminum. The preparation technology comprises the specificsteps of 1) dosing the aluminum alloy by mass percentage, and fusion casting the prepared pure aluminum and the ingredients into alloy ingots; 2) annealing the prepared alloy ingots, heating the alloyingots to 560 DEG C for holding for 48h, and then air-cooling to the room temperature; 3) hot-rolling the annealed alloy ingots to 30% deformation degree at 500 DEG C to obtain the required aluminumalloy sheets; 4) treating the hot rolled aluminum sheets with a solid solution at a solid solution temperature of 585 DEG C for holding for 1.5h; and 5) finally treating the aluminum sheets in the solid solution state by liquid nitrogen temperature control rolling, wherein the yield strength of the treated alloy is greater than 360MPa, the tensile strength is greater than 385MPa and the elongationis greater than 1%.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a preparation process of high-strength rare earth aluminum alloys. Background technique [0002] With the increasingly serious environmental pollution and resource consumption, people are increasingly aware of the importance of energy saving and emission reduction for future development. Especially in the automobile industry, it consumes huge amounts of energy every year. By the end of 2017, there were about 217 million automobiles in the country, and it is currently the second largest country in the world in terms of car ownership. But the huge number of cars will bring huge energy consumption and a large amount of pollutant discharge, which will aggravate the increasingly serious environmental pollution problem. Some analysis data show that every 10% reduction in vehicle mass can reduce vehicle fuel consumption by 6% to 8% and reduce emissions by 4%. In th...

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Problems solved by technology

When the material in solid solution state is plastically deformed, the lattice distortion in the matrix can effectively hinder the movement of dislocations and improve the performance to the greatest extent. Although the traditional heat treatment strengthened aluminum alloy can make the material The performance is improved, but the degree of improvement is limited, and there are certain limitations

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