MgAlZn series heat resistant magnesium alloy containing niobium

Abstract

The invention discloses a MgAlZn series heat resistant magnesium alloy containing niobium, and belongs to the magnesium alloy field. The magnesium alloy is composed of elements of Mg, Al, Zn, Mn, rare earths, Nb, Zr and M, and comprises, by weight, 1.5 to 2.5 percents of Al, 0.1 to 3.5 percents of Zn, 0.1 to 2.2 percents of Mn, 0.0002 to 16 percents of rare earths, 0.0002 to 4 percents of Nb, 0.001 to 2 percents of Zr, 0.0002 to 2 percents of M element, and the balance Mg; wherein the M element is at least one of Ti, Sr, Ca, C and B. According to the magnesium alloy, the structure of Beta phase is changed and the heat resistant performance of the magnesium alloy is improved by adding rare earth elements and the Nb element into the magnesium alloy; and grains are refined by adding the Zr and M elements, so that the heat resistant magnesium alloy which has good mechanical properties, machinability, mobility and die-casting properties and is suitable for casting in particular to die-casting is obtained.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a high-performance magnesium alloy suitable for casting, especially for high-pressure 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; Eu...

AI Technical Summary

Problems solved by technology

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.

Images