A kind of aluminum-zirconium alloy and its powder metallurgy forming method

Abstract

The invention discloses an aluminium-zirconium alloy and a powder metallurgic forming method thereof. The aluminium-zirconium alloy comprises the following components in percent by weight: 70-75 percent of aluminium and 25-30 percent of zirconium. The powder metallurgic forming method comprises the four steps of (1) preparing raw materials, auxiliary materials, tools and devices; (2) conducting vacuum induction melting on the alloy; (3) preparing master alloy powder; and (4) conducting powder metallurgic forming. The aluminium-zirconium alloy is low in impurity content, fine in crystal particle, homogeneous in component, and high in zirconium content, and the powder metallurgic forming method is high in purity, free of pollutants and waste gas, easy to control, stable in quality, and high in finished product ratio.

Description

technical field [0001] The invention relates to the field of aluminum alloy forming, in particular to an aluminum-zirconium alloy and a powder metallurgy forming method thereof. Background technique [0002] In industrial production, a small amount of zirconium is added to ultra-light aluminum-lithium alloys and Al-Zn-Mg-Cu high-strength aluminum alloys. Its functions are: one is to refine the as-cast grains, and the other is to homogenize the ingot When forming a uniform dispersion of Al 3 Zr can inhibit the recrystallization behavior of deformation processing, control the grain size and shape; at the same time, it can also improve the hardenability, weldability, fracture toughness, stress corrosion resistance and other comprehensive properties of Al-Zn-Mg-Cu alloy. The amount of zirconium added to aluminum alloy is 0.1% to 0.3%. During the aluminum alloy manufacturing process, the aluminum zirconium master alloy ingot containing 3% to 4% zirconium is added to the aluminum...

AI Technical Summary

Problems solved by technology

When this aluminum-zirconium master alloy ingot with structural defects is directly added to the aluminum alloy melt, the improper casting process often easily leads to large-sized Al in the aluminum-zirconium master alloy. 3 Zr compounds and their compounds are not fully dissolved, and then form "colloidal particles" that are directly inherited into the added aluminum alloy material. Due to the uncertainty of the segregation area of ​​this type of compound and the difficulty of flaw detection, etc., it seriously affects the quality of the added aluminum alloy material. Performance

[0003] Among the relevant patents that have been applied in China, the patent "Aluminium-Zirconium Master Alloy and Preparation Method" (application number: 201010585739.5, publication date: 2011-03-30) discloses a production process of aluminum-zirconium master alloy, but in its In the production process, because there is no vacuum environment, degassing and impurity removal are insufficient; because there is no restriction on the melting crucible material, it is possible to use a conventional cast iron crucible, which will make it difficult to control the content of impurity iron, because there is no electromagnetic stirring and In the powdering process, the original grains are not refined enough, which leads to the fact that the final finished aluminum-zirconium alloy can provide a small number of nuclei, uneven distribution, and the grown grain size is large and uneven when used as a grain refiner. Even, at the same time, due to the lack of powder metallurgy, the ratio of zirconium supersaturation cannot be adopted (if it is super saturated, it is easy to segregate, which will lead to uneven composition of the intermediate alloy ingot and inaccurate weighing during application), so the zirconium content Low, that is, the efficiency of the product is low; on the other hand, compared with the conventional method, the method adopted in this invention will still produce waste gas and waste residue that are difficult to handle, and because there is no high-efficiency equipment, the entire process is not easy to control, and the final product The quality of aluminum zirconium alloy is unstable

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