A low shrinkage magnesium alloy

A low-shrinkage, magnesium alloy technology, applied in the field of magnesium alloys, can solve problems affecting the size and pass rate of magnesium alloy parts, affecting the application of cast magnesium alloys, and cracking on the casting surface, achieving low shrinkage, excellent filling ability, The effect of small internal thermal stress

Inactive Publication Date: 2014-10-29
苏晓虎 +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A low shrinkage magnesium alloy

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Embodiment 1

[0026] The magnesium alloy is prepared according to the steps described in the first process above, and the casting is cast by a metal mold. The weight percentage of the magnesium alloy is composed of Al 1.5%, Mn 0.13%, Sm 0.0002%, Nb 0.0002%, Li 0.0002%, and the rest is Mg.

[0027] Castings are heat treated. See Table 1 for the properties of the magnesium alloy castings provided in this example.

Embodiment 2

[0029] The magnesium alloy is prepared according to the steps described in the first process above, and the casting is semi-solid casting. The weight percentage of the magnesium alloy is composed of Al 25%, Mn 2%, Y 16%, Nb 4%, Li 9%, and the rest is Mg.

[0030] Castings are heat treated. See Table 1 for the properties of the magnesium alloy castings provided in this example.

Embodiment 3

[0032] Prepare the magnesium alloy according to the steps described in the above process two, the casting adopts high pressure die casting, the weight percentage of the magnesium alloy is composed of Al 6%, Mn 0.2%, Gd 0.2%, Nb 1%, Li 0.6%, and the rest is Mg;

[0033] See Table 1 for the properties of the magnesium alloy castings provided in this example.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C23/02C22C23/06
Inventor 冯俊
Owner 苏晓虎
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