Heat-treated high-yield aluminum alloy material for die casting and preparation method of heat-treated high-yield aluminum alloy material

Abstract

The invention relates to a heat-treated high-yield aluminum alloy material for die casting and a preparation method thereof in the technical field of cast aluminum alloy materials, the heat-treated high-yield aluminum alloy material for die casting comprises Si, Al, Fe, Mg, Zn, Ti, Zr and Sr, the components are weighed according to the mass percent, and meanwhile, the preparation method of the heat-treated high-yield aluminum alloy material comprises the steps that 1, raw materials are weighed; 2, melting the raw materials; step 3, ultrasonic stirring; step 4, casting the molten liquid; the aluminum alloy material is obtained through heat treatment, grain refinement is facilitated, the corrosion resistance of an aluminum alloy plate is improved, meanwhile, recrystallization of the alloy in the deformation and heat treatment process can be restrained, the work hardening effect of the alloy can be kept by restraining recrystallization, deformation is restrained, and the aluminum alloy material has the characteristic of high yield degree.

Description

Technical Field

[0001] The invention relates to the technical field of cast aluminum alloy materials, in particular to a high-yield aluminum alloy material for heat treatment of die casting and a preparation method thereof. Background Art

[0002] Aluminum alloys are widely used in aerospace, automobile manufacturing, construction and other fields due to their advantages such as light weight, high strength and corrosion resistance. However, while maintaining good ductility, the yield strength of traditional aluminum alloy materials often cannot meet the needs of certain specific applications. Therefore, studying how to improve the yield strength of aluminum alloy materials through heat treatment processes while maintaining other mechanical properties is an important technical challenge in the current field. Therefore, in view of these current situations, it is urgent to develop a high-yield aluminum alloy material for heat treatment of die casting and its preparation method to meet the needs of practical use. Summary of the invention

[0003] The present invention aims to provide a high-yield aluminum alloy material for heat treatment of die casting and a preparation method thereof, so as to improve the mechanical properties of the aluminum alloy, especially in terms of yield strength.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A high-yield aluminum alloy material for heat treatment of die casting and a preparation method thereof, the formula comprising: Si, Al, Fe, Mg, Zn, Ti, Zr and Sr, the mass percentage content of each component is: 8.0-8.5% Si, 0-0.5% Fe, 0.5-1.2% Mg, 0-1.3% Zn, 0.08-0.15% Ti and 0.1-0.2% Zr, 0.02-0.04% Sr, and the rest is Al.

[0005] A method for preparing a heat-treated high-yield aluminum alloy material for die casting, comprising step 1, weighing raw materials; step 2, melting raw materials; step 3, ultrasonic stirring; step 4, molten metal casting; step 5, heat treatment; characterized in that: In the above step 1, the raw materials are selected according to the mass percentage of each component: 8.0-8.5% Si, 0-0.5% Fe, 0.5-1.2% Mg, 0-1.3% Zn, 0.08-0.15% Ti, 0.1-0.2% Zr, 0.02-0.04% Sr, and the rest is Al, and the raw materials are weighed according to the sum of the mass percentages being 1; In the above step 2, the raw materials weighed in step 1 are first mixed and stirred, then placed in a smelting furnace, filled with a mixed gas of nitrogen and argon, and heated and melted in a vacuum environment to obtain an alloy melt; In the above step 3, an ultrasonic stirrer is started to stir the alloy melt prepared in step 2 so that the components in the alloy melt are fully mixed; In the above step 4, the alloy melt mixed evenly in step 3 is poured into a molding mold, cast and molded, and then opened to obtain an aluminum alloy material; In the above step five, the aluminum alloy material prepared in step four is placed in a heat treatment device, and homogenized under vacuum conditions. After the homogenization treatment, the aluminum alloy material is kept warm for a period of time for annealing. The heat-treated aluminum alloy material is placed in an ultrasonic cleaner for ultrasonic cleaning, and the finished aluminum alloy material is obtained after cleaning.

[0006] In the above description, as a further solution, in step 1, the raw material selected is powder.

[0007] In the above description, as a further solution, in step 2, the volume ratio of nitrogen to argon is 1:1.

[0008] In the above description, as a further solution, in step 2, the melting temperature is 750°C and the heating rate is 200°C / 30min.

[0009] In the above description, as a further solution, the stirring frequency of the ultrasonic stirrer is 30 KHz, and the stirring time is 30 min.

[0010] In the above description, as a further solution, in step five, the temperature of the homogenization treatment is 300-400° C., and the time of the homogenization treatment is 5-10 hours.

[0011] In the above description, as a further solution, in step 5, the insulation temperature is 360° C. and the insulation time is 4 hours.

[0012] In the above description, as a further solution, in step five, the frequency of ultrasonic cleaning is 15-40KHz, and the time of ultrasonic cleaning is 100-200s.

[0013] The beneficial effects produced by the present invention are as follows: The present invention discloses a high-yield aluminum alloy material for heat treatment of die casting and a preparation method thereof. Compared with the existing aluminum alloy, the composition ratio of the alloy is improved, which not only improves the strength of the aluminum alloy, but also makes it have good corrosion resistance. On the other hand, the present invention melts the raw materials in a vacuum and protective gas, which reduces the generation of impurities. At the same time, ultrasonic stirring is used to mix the raw materials more evenly, thereby ensuring the quality of the finished aluminum alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1The present invention is a schematic flow chart of the steps of the method for preparing the heat-treated high-yield aluminum alloy material. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0016] See also Figure 1 The specific heat-treated high-yield aluminum alloy material includes: Si, Al, Fe, Mg, Zn, Ti, Zr and Sr, and the mass percentage content of each component is: 8% Si, 0.5% Fe, 1.0% Mg, 1.0% Zn, 0.1% Ti, 0.2% Zr, 0.04% Sr and 89.16% Al.

[0017] The method for preparing a heat-treated high-yield aluminum alloy material comprises the following steps: first, weighing raw materials; second, melting raw materials; third, ultrasonic stirring; fourth, molten metal casting; and fifth, heat treatment. The method is characterized in that: In the above step 1, the components are weighed according to their mass percentage: 8% Si, 0.5% Fe, 1.0% Mg, 1.0% Zn, 0.1% Ti, 0.2% Zr, 0.04% Sr and 89.16% Al, wherein the raw material selected is powder; In the above step 2, the raw materials weighed in step 1 are first mixed and stirred, and then put into a melting furnace, and a mixed gas of nitrogen and argon is filled, wherein the volume ratio of nitrogen to argon is 1:1, the melting temperature is 740°C, the heating rate is 200°C / 30min, and the raw materials are heated and melted in a vacuum environment to obtain an alloy melt; In the above step 3, an ultrasonic stirrer is started to stir the alloy melt prepared in step 2, the stirring frequency of the ultrasonic stirrer is 30 KHz, and the stirring time is 30 min, so that the components in the alloy melt are fully mixed; In the above step 4, the alloy melt mixed evenly in step 3 is poured into a molding mold, cast and molded, and then opened to obtain an aluminum alloy material; In the above step five, the aluminum alloy material prepared in step four is placed in a heat treatment device, and homogenized under vacuum conditions at a temperature of 400°C for 10 hours, followed by insulation at a temperature of 360°C for 4 hours, and then annealing. The heat-treated aluminum alloy material is placed in an ultrasonic cleaner for ultrasonic cleaning at a frequency of 40KHz for 200 seconds, and the finished aluminum alloy material is obtained after cleaning.

[0018] Based on the above, the present invention adds Zr and Ti to the formula to improve the strength of the aluminum alloy. Experiments have proved that the present invention can significantly refine the cast structure by increasing the Zr content, which is beneficial to grain refinement and improves the corrosion resistance of the aluminum alloy plate. At the same time, Zr can inhibit the recrystallization of the alloy during deformation and heat treatment. By inhibiting recrystallization, the alloy can maintain the work hardening effect, inhibit deformation and have the characteristics of high yield. At the same time, the present invention adds Ti, which has a significant effect on improving the room temperature and high temperature strength of the alloy in the aluminum alloy. It can stabilize the α phase, increase the phase transition temperature, and at the same time reduce the specific gravity and increase the elastic modulus. The present invention performs raw material smelting in a vacuum and a protective gas, reduces the generation of impurities, and uses ultrasonic stirring on the alloy melt to fully mix the raw materials, thereby improving the quality of the aluminum alloy.

[0019] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A high yield aluminum alloy material for heat treatment of die casting, the formula comprising: Si, Al, Fe, Mg, Zn, Ti, Zr and Sr, characterized in that the mass percentage content of each component is: 8.0-8.5% Si, 0-0.5% Fe, 0.5-1.2% Mg, 0-1.3% Zn, 0.08-0.15% Ti and 0.1-0.2% Zr, 0.02-0.04% Sr, and the rest is Al.

2. A method for preparing a heat-treated high-yield aluminum alloy material for die casting, characterized in that: The step 1, weighing the raw materials; the step 2, melting the raw materials; the step 3, ultrasonic stirring; the step 4, molten metal casting; the step 5, heat treatment; is characterized in that: Wherein in the above step 1, according to the mass percentage of each component, 8.0-8.5% Si, 0-0.5% Fe, 0.5-1.2% Mg, 0-1.3% Zn, 0.08-0.15% Ti and 0.1-0.2% Zr, 0.02-0.04% Sr, and the rest is Al, and the rest is Al for raw material selection, and weighed according to the sum of mass percentages being 1; In the above step 2, the raw materials weighed in step 1 are first mixed and stirred, then placed in a smelting furnace, filled with a mixed gas of nitrogen and argon, and heated and melted in a vacuum environment to obtain an alloy melt; In the above step 3, an ultrasonic stirrer is started to stir the alloy melt prepared in step 2 so that the components in the alloy melt are fully mixed; In the above step 4, the alloy melt mixed evenly in step 3 is poured into a molding mold, cast and molded, and then opened to obtain an aluminum alloy material; In the above step five, the aluminum alloy material prepared in step four is placed in a heat treatment device, and homogenized under vacuum conditions. After the homogenization treatment, the aluminum alloy material is kept warm for a period of time for annealing. The heat-treated aluminum alloy material is placed in an ultrasonic cleaner for ultrasonic cleaning, and the finished aluminum alloy material is obtained after cleaning.

3. The method for preparing a heat-treated high-yield aluminum alloy material for die casting according to claim 2, characterized in that: In the step 1, the raw material selected is powder.

4. The method for preparing a heat-treated high-yield aluminum alloy material for die casting according to claim 2, characterized in that: In the step 2, the volume ratio of nitrogen to argon is 1:

1.

5. The method for preparing a heat-treated high-yield aluminum alloy material for die casting according to claim 2, characterized in that: In the step 2, the melting temperature is 740°C and the heating rate is 200°C / 30min.

6. The method for preparing a heat-treated high-yield aluminum alloy material for die casting according to claim 2, characterized in that: The stirring frequency of the ultrasonic stirrer is 30 KHz, and the stirring time is 30 min.

7. The method for preparing a heat-treated high-yield aluminum alloy material for die casting according to claim 2, characterized in that: In the step 5, the temperature of the homogenization treatment is 300-400° C., and the time of the homogenization treatment is 5-10 hours.

8. The method for preparing a heat-treated high-yield aluminum alloy material for die casting according to claim 2, characterized in that: In the step 5, the insulation temperature is 360° C. and the insulation time is 4 hours.

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