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Heat resistant magnesium alloy

A magnesium alloy, heat-resistant technology, applied in the field of magnesium alloys, can solve the problems of high temperature resistance, high working temperature, unsuitable components to work, etc., and achieve the effect of improving high temperature resistance, good fluidity and die casting, and excellent mechanical properties.

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

AI Technical Summary

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.

Method used

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  • Heat resistant magnesium alloy
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare the heat-resistant magnesium alloy according to the steps described in the above-mentioned process one, and the casting is cast by metal mold, and the weight percentage of the magnesium alloy is composed of Al 25%, Zn 3.5%, Mn 2.2%, Y 16%, Nb 4%, Zr 2 %, the rest is Mg.

[0030] Heat treatment of castings (T4 solid solution treatment process): the castings are heated up to 400°C in a box-type resistance furnace and kept for 12 hours. After the castings are released from the furnace, they are water quenched at a water temperature of 80°C.

[0031] See Table 1 for the properties of the magnesium alloy castings provided in this example.

Embodiment 2

[0033] Prepare the heat-resistant magnesium alloy according to the steps described in the above-mentioned process two, the casting adopts semi-solid casting, and the weight percentage of the magnesium alloy is composed of Al 10%, Zn 1%, Mn 0.6%, Gd 2%, Nb 1%, Zr 0.9 %, the rest is Mg.

[0034]Heat treatment of castings (T4 solid solution treatment process): the castings are heated up to 400°C in a box-type resistance furnace and kept for 12 hours. After the castings are released from the furnace, they are water quenched at a water temperature of 80°C.

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

Embodiment 3

[0037] Prepare the heat-resistant magnesium alloy according to the steps described in the above-mentioned process 1. The casting adopts high-pressure die-casting, and the weight percentage of the heat-resistant magnesium alloy is composed of Al 1.5%, Zn 0.1%, Mn 0.1%, Sm 0.0002%, Nb 0.0002%, Zr 0.001% , and the rest are Mg.

[0038] See Table 1 for the properties of the magnesium alloy castings provided in this example.

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Abstract

The invention discloses a heat resistant magnesium alloy and belongs to the magnesium alloy field. The magnesium alloy is composed of Mg, Al, Zn, Mn, rare earths, Nb and Zr, 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 rear earths, 0.0002 to 4 percents of Nb, 0.001 to 2 percents of Zr, 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; and grains are refined and the alloy liquid is purified by adding the Zr element, so that the heat resistant performance of the magnesium alloy is improved, and 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 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...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03
Inventor 冯俊
Owner JIANGHAN UNIVERSITY
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