A low shrinkage magnesium alloy

Abstract

The invention discloses low-shrinkage magnesium alloy, and belongs to the field of magnesium alloy. The low-shrinkage magnesium alloy comprises the following elements in percent by weight: 1.5 to 25% of Al (aluminium), 0.13 to 2% of Mn (manganese), 0.0002 to 16% of rare earth, 0.0002 to 4% of Nb (niobium), 0.0002 to 9% of Li (lithium), and Mg (magnesium) in balancing amount. The beta-phase structure is changed by adding the rare earth element and the Nb element in the magnesium alloy, the grain refinement is achieved through adding the Li element, and through the combination of the elements, the crystallization latent heat is changed in alloy solidification, thereby obtaining the low-shrinkage magnesium alloy which has an excellent filling capacity, low shrinkage, excellent mechanical property, machinability, flowability and good die-casting performance and is suitable for casting.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a MgAlMn series low shrinkage magnesium alloy. 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 MgAlMn series die-casting magnesium alloys are YM202, YM203, YM204, YM205; the grades of MgAlMn series die-casting magnesium alloys of the American standard ASTM B are AM50A, AM60A, AM60B; the grades of MgAlMn series of die-casting magnesium alloys of the Japanese standard JIS H are MDC2B, MDC4, MDC5; European standard EN MgAlMn die-casting magnes...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: during the casting of magnesium alloys, the molten metal is affected by volume shrinkage during the process of solidification, and the internal stress is very large, which easily causes cracks on the casting surface , and even the phenomenon that the casting breaks when the mold is opened

This hot cracking phenomenon has seriously affected the application of cast magnesium alloys, affecting the size and pass rate of magnesium alloy parts

The above-mentioned die-casting magnesium alloy wire shrinkage rate is 1.5-2%, which cannot effectively avoid the phenomenon of cracking on the casting surface caused by volume shrinkage

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