MgAlZn heat resistance magnesium alloy

Abstract

The invention discloses an MgAlZn heat resistance magnesium alloy, which belongs to the magnesium alloy field. The magnesium alloy is composed of Mg, Al, Zn, Mn, rare earth and Nb with the mass percentage: 1.5-18% of Al, 0.1-3.5% of Zn, 0.1-2.2% of Mn, 0.0002-8% of rare earth, 0.0002-2.2% of Nb and the balance of Mg. According to the invention, rare earth and Nb element are added in the magnesium alloy, a structure of a beta phase is changed, thereby the high temperature resistance performance of the magnesium alloy can be enhanced, so that the heat resistance magnesium alloy which is suitable for casting, especially suitable for die casting with characteristics of excellent mechanical property, good machinery processability, fluidity and die casting performance can be acquired.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a MgAlZn heat-resistant magnesium alloy suitable for casting, especially die-casting. Background technique [0002] With the development of science and technology, vehicles represented by automobiles need to further develop new products with higher fuel efficiency by reducing the weight of the body. In the automobile manufacturing industry, magnesium alloy, as a new type of lightweight metal material, is used by automobile manufacturers to replace traditional cast iron in order to achieve the purpose of reducing the weight of the vehicle body. [0003] At present, the grades of domestic MgAlZn series die-casting magnesium alloys are YM302, YM303, YM304, YM305; the grades of MgAlZn series die-casting magnesium alloys of the American standard ASTM B are AZ91A, AZ91B, AZ91D; the grades of MgAlZn series die-casting magnesium alloys of the Japanese standard JIS H are MDC1B, MDC1D; European standa...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor has found that the prior art has at least the following problems: some parts on the automobile, such as: gearbox case, engine case cover, etc., have higher operating temperature, and there are also lightweight parts. need

But the above-mentioned MgAlZn series magnesium alloy is due to the β phase in the alloy structure as Mg 17 Al 12 Mainly, Mg 17 Al 12 The melting point is low, and it is not resistant to high temperatures. The tensile strength of the above-mentioned MgAlZn series magnesium alloys is less than 90 MPa at a high temperature of 200 ° C. Therefore, the parts produced by it are not suitable for working in a high-temperature environment, so they cannot meet the high-temperature resistance requirements of the above-mentioned parts of automobiles.

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