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High-strength heat-resistant magnesium alloy

A magnesium alloy, high-strength technology, applied in the field of magnesium alloy materials, can solve the problems affecting the safety and reliability of magnesium alloy parts, unstable high-temperature strength, and strength reduction, achieving good strength stability, reducing alloy costs, and wide application Foreground effect

Inactive Publication Date: 2015-08-05
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the temperature increases, the strength of Mg-RE alloys (such as the commercial heat-resistant magnesium alloy WE43) decreases significantly, resulting in unstable strength at high temperatures, which will seriously affect the safety and reliability of magnesium alloy parts working at high temperatures , so that it cannot fully meet the requirements of the aerospace and automotive industries for the strength of parts at 200°C-300°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The high-strength heat-resistant magnesium alloy in this embodiment is composed of the following components in mass percentage: 6.2%Y, 0.5%Ce, 0.4%Zr, 0.2%Sb, and the balance is Mg and unavoidable impurities, wherein the impurity elements Si, The total amount of Fe, Cu and Ni is less than 0.2%. The total rare earth content is 6.7%.

[0012] The raw materials are prepared according to the above alloy composition, and the preparation process of the magnesium alloy is as follows: melting in a corundum crucible and an induction furnace. in CO 2 +SF 6 Under the protection of mixed gas, first melt pure Mg and Sb, then add master alloys Mg-25%Y, Mg-25%Ce and Mg-25%Zr for smelting, then, the temperature of magnesium alloy solution is raised to 750°C and poured into steel Molds were made to obtain magnesium alloy ingots, followed by heat treatment: solution treatment at 525°C for 8 hours, aging treatment at 225°C for 16 hours. The product is obtained, and Mg is generated ins...

Embodiment 2

[0016] The high-strength heat-resistant magnesium alloy of this embodiment is composed of the following components in mass percentage: 5.8%Y, 0.6%Ce, 0.5%Zr, 0.3%Sb, and the balance is Mg and unavoidable impurities, wherein the impurity elements Si, The total amount of Fe, Cu and Ni is less than 0.2%. The total rare earth content is 6.4%.

[0017] The smelting, casting, heat treatment process, and tensile strength test method of the high-strength heat-resistant magnesium alloy in this embodiment are the same as those in Embodiment 1.

[0018] The heat-resistant magnesium alloy obtained in this example has a tensile strength of 262MPa at room temperature, 244MPa at 200°C, 224MPa at 250°C, and as high as 210MPa at 300°C; compared with WE43 alloy, the rare earth content is slightly lower and the strength is higher. High, the service temperature can reach 300°C, and the strength stability at 200°C-300°C is better than WE43.

Embodiment 3

[0020] The high-strength heat-resistant magnesium alloy of this embodiment is composed of the following components by mass percentage: 5.5%Y, 0.7%Ce, 0.6%Zr, 0.5%Sb, and the balance is Mg and unavoidable impurities, wherein the impurity elements Si, The total amount of Fe, Cu and Ni is less than 0.2%. The total rare earth content is 6.2%.

[0021] The smelting, casting, heat treatment process, and tensile strength test method of the high-strength heat-resistant magnesium alloy in this embodiment are the same as those in Embodiment 1.

[0022] The heat-resistant magnesium alloy obtained in this example has a tensile strength of 260MPa at room temperature, 240MPa at 200°C, 222MPa at 250°C, and as high as 206MPa at 300°C; compared with WE43 alloy, the rare earth content is slightly lower and the strength is higher. High, the service temperature can reach 300°C, and the strength stability at 200°C-300°C is better than WE43.

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Abstract

The invention discloses a high-strength heat-resistant magnesium alloy and belongs to the technical field of magnesium alloy materials. The high-strength heat-resistant magnesium alloy comprises the following components in percentage by mass: 5.5-6.2% of Y, 0.5-0.7% of Ce, 0.4-0.6% of Zr, 0.2-0.5% of Sb and the balance of Mg and inevitable impurities. The magnesium alloy is prepared by taking pure Mg and Sb as well as intermediate alloys of Mg-25%Y, Mg-25%Ce and Mg-25%Zr as raw materials, smelting and casting to obtain magnesium alloy ingots at first, then performing solid-solution treatment on the magnesium alloy ingots sequentially for 8 hours at 525 DEG C, and performing aging treatment for 16 hours at 225 DEG C. The magnesium alloy disclosed by the invention has relatively high room-temperature and high-temperature strength, and has relatively good strength stability at 200-300 DEG C.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a high-strength heat-resistant magnesium alloy. Background technique [0002] As the lightest metal structural material, magnesium alloys are increasingly used in automobiles. The use of magnesium alloys can reduce the weight of automobiles, reduce energy consumption, reduce exhaust emissions, and alleviate environmental pollution, which is of great significance to the automobile industry. However, the strength and heat resistance of magnesium alloys are not good, especially at high temperatures, the strength drops sharply, which seriously hinders its application in aerospace and automobile industries. Therefore, improving the strength and high temperature strength stability of magnesium alloys is a must in the field of magnesium alloys important research topic. [0003] The heat resistance of magnesium alloys can be improved through proper alloyin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06
Inventor 张清陈君李全安李武会朱利敏张兴渊
Owner HENAN UNIV OF SCI & TECH
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