High-zinc deformation magnesium alloy and preparation and processing method thereof

Abstract

The invention relates to a high-zinc deformation magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 8-12% of Zn, 0.5-1.5% of Ca, 0.5-1.0% of MM and the balance of Mg, wherein MM represents Ce-rich mixed rare earth and comprises the following components in parts by mass: 48 parts of Ce, 30 parts of La, 18 parts of Nd, 3 parts of Pr and about 1% of impurities which are Fe and Mn mainly. The preparation method of the magnesium alloy comprises the steps of smelting of the alloy, semi-solid extraction, homogenization treatment, re-deformation and aging deformation heat treatment. The Mg-Zn-Ca-MM alloy provided by the invention has better room-temperature mechanical property, and the mechanical property of the alloy after solid solution and aging can achieve 400-460MPa; meanwhile, the elongation rate of the alloy can achieve 7%-10%; and in addition, the alloy has certain high temperature resistance, and the breaking strength can be above 200MPa when breaking at 200 DEG C.

Description

technical field [0001] The invention relates to a high-zinc deformed magnesium alloy and a preparation method thereof, belonging to the category of industrial deformed magnesium alloys. Background technique [0002] Magnesium alloy is an important candidate material for aerospace research and production in the 21st century due to its low density and easy recycling. At present, the relatively mature magnesium alloy systems mainly include AZ, AM and ZK alloys. Better formability and lower cost are the original intention of developing the above alloy systems, which have been recognized by the market. However, the above-mentioned alloys also have obvious problems, that is, their poor heat resistance, which greatly limits their ability to serve under high temperature conditions. Relatively speaking, pure rare earth alloys have better heat resistance and are mainly used in the military industry, but their cost is high, and the possibility of wide application is small. [0003] C...

AI Technical Summary

Problems solved by technology

However, the important defect of rare earth-containing magnesium alloys is that their plasticity is relatively poor. This is mainly because the stability of the rare earth phase makes it difficult for dislocations to move, the mobility of grain boundaries decreases, and the mutual coordination between grains decreases. Limits the impact resistance of rare earth magnesium alloys, and eventually leads to brittle fracture of the alloys during service at room temperature

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