High-strength Mg-Zn-Al deformation magnesium alloy containing Cu and preparation method thereof

Abstract

The invention relates to a high-strength Mg-Zn-Al deformation magnesium alloy containing Cu and a preparation method thereof, and belongs to the technical field of magnesium alloys. The magnesium alloy consists of the following components in percentage by mass: 5.5-6.5% of Zn, 2.5-3.5% of Al, 0.1-2.1% of Cu, 0.15% or less of inevitable impurities, and the balance of magnesium. 0.1-2.1% of Cu element is added in the magnesium alloy, so that low-melting-point beta-Mg17Al12 phases continuously distributed in a netty form are gradually converted to high-melting-point MgAlCu ternary phases finely scattered, formation of the beta-Mg17Al12 phases is weakened, the mechanical performances of the alloy are improved, and the alloy can serve under higher temperature; the MgAlCu ternary phases can effectively stop growth of grains in dynamic recrystallization process; and the grain size in final extrusion state is about 2 microns. The preparation method of the magnesium alloy is easy to perform, short in time consumption, low in equipment requirements and low in production cost; graphite powder is firstly used for covering when the magnesium alloy is homogenized; and then, an aluminum foil is used for packing to preferably prevent overheating or overburning of the alloy.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, and relates to a Cu-containing high-strength Mg-Zn-Al series deformed magnesium alloy and a preparation method thereof. Background technique [0002] Considering the excellent comprehensive properties of magnesium alloys, and with the increasingly serious energy crisis and environmental problems, the development of magnesium alloys as lightweight structural materials has become urgent. According to whether magnesium alloy contains zirconium, magnesium alloy can be divided into zirconium-containing magnesium alloy and zirconium-free magnesium alloy. Zirconium-containing magnesium alloys usually have fine grains and good mechanical properties. However, the price of zirconium element is relatively expensive, which increases the production cost and is not conducive to the mass production of zirconium-containing magnesium alloys. In addition, in order to improve the strength and toughness o...

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Problems solved by technology

However, the price of zirconium element is relatively expensive, which increases the production cost and is not conducive to the mass production of zirconium-containing magnesium alloys

In addition, in order to improve the strength and toughness of magnesium alloys, deformation processing techniques such as extrusion, rolling, forging, etc. are usually used to optimize the strength of magnesium alloys, or by adding some rare earth elements, such as Gd, Er, Nd, Y, Ce, etc. To improve the strength and plasticity of magnesium alloys, but the production cost of this method is high, which limits the wide-scale use of magnesium alloys containing rare earths

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