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Magnesium alloy with hot cracking resistance and low linear shrinkage

A linear shrinkage, magnesium alloy technology, applied in the field of magnesium alloys, can solve problems affecting the application of cast magnesium alloys, affect the pass rate of magnesium alloy parts, and the castings will break when the mold is opened, and achieve excellent filling ability, liquid volume and solid state. Effect of small volume change and small internal thermal stress

Inactive Publication Date: 2012-08-01
JIANGHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: during the casting of magnesium alloys, the molten metal is affected by volume shrinkage during the solidification process, and the internal stress is very large, which is easy to cause the casting surface Cracking, internal shrinkage cavity, and even the phenomenon that the casting will break when the mold is opened
This hot cracking phenomenon seriously affects the application of cast magnesium alloys and affects the pass rate of magnesium alloy parts
The shrinkage rate of the above-mentioned die-casting magnesium alloy wire is 1.5-2%, and there is obvious thermal cracking phenomenon, which limits its application range

Method used

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  • Magnesium alloy with hot cracking resistance and low linear shrinkage

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Effect test

Embodiment 1

[0027] The magnesium alloy is prepared according to the steps described in the above-mentioned process one, and the casting adopts metal mold casting, and the weight percentage of the magnesium alloy is composed of Al 1.5%, Zn 0.1%, Mn 0.1%, Y 0.0002%, Nb 0.0002%, Li 0.0002%, The remainder is Mg.

[0028] Castings are heat treated.

[0029] See Table 1 for the properties of the magnesium alloy castings provided in this example.

Embodiment 2

[0031] The magnesium alloy is prepared according to the steps described in the above process two, and the casting adopts semi-solid casting, and the weight percentage of the magnesium alloy is composed of Al 25%, Zn 3.5%, Mn 2.2%, Sc 16%, Nb 4%, Li 9%, The remainder is Mg.

[0032] Castings are heat treated. See Table 1 for the properties of the magnesium alloy castings provided in this example.

Embodiment 3

[0034] Prepare the magnesium alloy according to the steps described in the above-mentioned process two, the casting adopts high-pressure die-casting, the weight percentage of the magnesium alloy is composed of Al3.5%, Zn 3%, Mn 2%, Sm 5%, Nb 2%, Li 7%, and the rest is Mg;

[0035] See Table 1 for the properties of the magnesium alloy castings provided in this example.

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Abstract

The invention discloses a magnesium alloy with hot cracking resistance and low linear shrinkage, and belongs to the magnesium alloy field. The magnesium alloy is composed of elements of Mg, Al, Zn, Mn, rare earths, Nb and Li, and comprises, by weight, 1.5 to 25 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, 0.0002 to 9 percents of Li, and the balance Mg. According to the magnesium alloy, the structure of Beta phase is changed by adding rare earth elements and the Nb element into the magnesium alloy; grains are refined by adding the Li element; and crystallization latent heat is changed when the magnesium alloy is solidified by the combined action of the elements, so that the heat resistant magnesium alloy which has good mold-filling capacities, low shrinkage rate, good mechanical properties, machinability, mobility and die-casting properties and is suitable for casting is obtained.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a MgAlZn 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 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 standard EN MgAlZn die-casting magnesium alloy grade...

Claims

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Application Information

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IPC IPC(8): C22C23/02
Inventor 冯俊
Owner JIANGHAN UNIVERSITY
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