Aluminum alloy material capable of being anodized and suitable for semi-solid forming and preparing method of aluminum alloy material

Abstract

The invention provides an aluminum alloy material capable of being anodized and suitable for semi-solid forming and a preparing method of the aluminum alloy material. The aluminum alloy is composed of the following elements including Mg, Si, Zn, Sc, Zr, Mn and the balance Al and inevitable impurity elements. The preparing method includes the following steps that an aluminum alloy melt is prepared through the preparing method for the aluminum alloy material; the aluminum alloy melt is stirred under the temperature of 720 DEG C to 730 DEG C and then is subjected to standing, refining gas removing and slag removing are conducted under the temperature of 710 DEG C to 720 DEG C, then heat insulation is conducted under the temperature of 650 DEG C to 670 DEG C after standing is conducted again, and molten aluminum alloy is obtained; the molten aluminum alloy is put into a semi-solid electromagnetic stirring device to be subjected to electromagnetic stirring, and then semi-solid slurry is obtained; and the semi-solid slurry is subjected to pressure casting or extrusion casting forming, and the aluminum alloy material is obtained. The prepared aluminum alloy capable of being anodized and suitable for semi-solid forming is high in thixotropy in a semi-solid state, the processing process is easy to control, the semi-solid forming performance is good, meanwhile, no air holes or cracks or the like exist in formed thin-wall parts, and the yield is high.

Description

technical field [0001] The invention relates to an aluminum alloy material capable of anodic oxidation and suitable for semi-solid forming and a preparation method thereof, belonging to the technical field of aluminum alloy materials. Background technique [0002] With the rapid development of the communication industry, electronic products such as computers and mobile phones are more and more widely used in people's work and life, and the appearance of metal texture is favored by many people. Due to the advantages of high specific strength, excellent thermal conductivity and corrosion resistance, good formability and beautiful appearance, aluminum alloy has developed into the most widely used metal material in the structural parts of electronic product shells. In recent years, the research and development and industrialization of thin-walled parts of aluminum alloy shells have attracted much attention. Liquid die casting and die forging are still the main production methods...

AI Technical Summary

Problems solved by technology

The disadvantages of this invention technology are: no Si element is added, although the anodic oxidizability can be improved, but the fluidity of the alloy melt is low, and the die-casting process is not easy to control; the addition of Sc element is too small, which has little effect on the modification of the aluminum alloy, and can improve the mechanical properties. On the one hand, the best contribution effect cannot be achieved; if the Zn element exceeds 2.0wt%, the hot cracking tendency is greater; in addition, the structure obtained by liquid die-casting is not dense enough, and pores are easy to occur

The disadvantage of this invention technology is that: the Si content in the alloy is too high, and silicon ions often exist in the electrolyte in a suspended state during the oxidation process, which has a very adverse effect on the anodic oxidation effect; when the temperature of the slurry reaches 605-615 ° C, the Die-casting belongs to high solid fraction forming. For forming thin shell parts, its filling ability is difficult to meet the requirements, and defects are prone to occur.

[0006] Semi-solid forming technology is a processing method with great potential. At present, there are very few applications in the processing of thin-walled parts of the shell. A key problem is the lack of suitable aluminum alloy materials, which cannot achieve high strength while ensuring high strength. Good anodizing and semi-solid forming properties

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