A kind of preparation method of graphene reinforced mg-al-zn alloy

Abstract

The invention provides a method for preparing a graphene-reinforced Mg-Al-Zn alloy, which belongs to the technical field of metal material manufacturing. A method for preparing a graphene-reinforced Mg-Al-Zn alloy, comprising the following steps: under melting and casting conditions, using high-energy ultrasound to add magnesium-graphene intermediate particles to a magnesium alloy melt in batches, and then rapidly cooling and pouring to obtain a casting billet; Then put the casting billet into the vacuum melting furnace for melting, use the electromagnetic force generated by the alternating current to further disperse the reinforcing phase, then keep warm, and then quickly spray cast to obtain the spray casting billet; then heat the spray casting billet in the vacuum heat treatment furnace, Finally, high-performance composite materials are obtained under suitable process parameters. The invention has the advantages of stable process, environmental protection and safety, obviously refined structure of the prepared composite material, good combination of graphene and matrix interface, relatively uniform distribution, and greatly improved comprehensive mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a method for preparing a graphene-reinforced Mg-Al-Zn alloy. Background technique [0002] The density of magnesium and magnesium alloys is 2g / cm 3 Below, it is considered to be the lightest metal structural material in engineering applications. Magnesium and magnesium alloys also have a series of advantages such as specific strength, high specific stiffness, good thermal conductivity, strong vibration damping performance, and radiation resistance. They are "green engineering materials in the 21st century". Magnesium and magnesium alloys are known as "inexhaustible" metal materials because they can be recycled. In addition, my country has extremely rich magnesium resources, and the output of primary magnesium ranks first in the world. However, magnesium and magnesium alloys have not been widely used in practical industrial applications at prese...

AI Technical Summary

Problems solved by technology

In the published patent No. 103773980A, entitled "Preparation method of high-performance graphene nanosheet reinforced magnesium-based composite material", graphene nanosheet-reinforced magnesium-based composite material was prepared by powder mixing ball milling combined with ultrasonic and hot pressing methods, However, the use of mixed powder ball milling in this method is likely to cause greater damage to the structure of graphene, which ultimately affects its enhancement effect, and the content of enhanced graphene in this method is relatively large, which is prone to agglomeration and reduces the performance of the product.

In the published patent No. 109207780A, titled "A rolling method for strengthening AZ31 magnesium alloy", carboxylated graphene is used to coat titanium oxide and then undergo powder mixing, ball milling, sintering, hot extrusion and multi-pass hot extrusion. The method prepared graphene-reinforced magnesium-based composites, which has the following disadvantages: firstly, the carboxylated graphene itself introduces defects on the basis of graphene, and the subsequent ball milling process will damage its structure, so The quality of the added graphene will be reduced; secondly, the process of coating titanium oxide is cumbersome, only a small amount of titanium oxide can be coated at a time, and the coating cycle is longer

Studies have shown that squeeze casting works better in these methods, but in this casting, when the amount of graphene added exceeds 0.3wt.%, it will agglomerate in the matrix