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High-temperature-resistant and high-pressure-resistant creep die-casting magnesium alloy and preparation method thereof

A technology of high temperature resistance and high pressure casting, which is applied in the field of magnesium alloys to achieve the effect of improving resistance, low cost and excellent creep resistance under high temperature and high pressure.

Pending Publication Date: 2021-09-03
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is no magnesium alloy in the prior art whose creep resistance can fully meet the requirements of use in an environment of 200°C and above

Method used

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  • High-temperature-resistant and high-pressure-resistant creep die-casting magnesium alloy and preparation method thereof
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preparation example Construction

[0039] The preparation method of the high temperature and high pressure resistant creep die-casting magnesium alloy of the present invention comprises the following steps:

[0040] 1) Taking magnesium source, zinc source, lanthanum source, yttrium source, zirconium source and manganese source according to the composition, melting to obtain alloy liquid;

[0041] 2) High pressure casting the alloy liquid obtained in step 1) to obtain a high temperature and high pressure resistant creep die-casting magnesium alloy.

[0042] The present invention has no special limitation on the smelting method, and the technical scheme of metal smelting well-known to those skilled in the art can be adopted.

[0043] The melting temperature of the present invention is preferably 700°C to 760°C, more preferably 720 to 740°C, and most preferably 730°C.

[0044] The present invention is preferably smelted under the condition of protective gas; the present invention has no special limitation to the ty...

Embodiment 1

[0058] Preheat 10650g of pure magnesium, 600g of pure zinc, 500g of magnesium-lanthanum master alloy and 2250g of magnesium-yttrium master alloy to 300°C. First, put the preheated pure magnesium, magnesium-lanthanum master alloy and magnesium-yttrium master alloy into a crucible preheated to 300°C, and pour SF into the crucible 6 and CO 2 The volume ratio of the mixed gas is 1:80. After the material is melted, the melt temperature is raised to 730°C, and then the above-mentioned pure zinc preheated to 300°C is added to the crucible under stirring conditions for 8 minutes of mixing to obtain an alloy liquid ; Cool the alloy solution to 715°C and let it stand for 30 minutes.

[0059] Die-cast the above-mentioned alloy liquid after standing still on a cold chamber die-casting machine with a clamping force of 280 tons to obtain a high-temperature and high-pressure creep die-casting magnesium alloy. The die-casting temperature is 715°C, and the die-casting mold temperature is 240±...

Embodiment 2

[0063] Preheat 11475g of pure magnesium, 150g of pure zinc, 3000g of magnesium-lanthanum master alloy and 375g of magnesium-yttrium master alloy to 300°C. First, put the preheated pure magnesium, magnesium-lanthanum master alloy and magnesium-yttrium master alloy into a crucible preheated to 300°C, and pour SF into the crucible 6 and CO 2 The volume ratio of the mixed gas is 1:80. After the material is melted, the melt temperature is raised to 730°C, and then the above-mentioned pure zinc preheated to 300°C is added to the crucible under stirring conditions for 8 minutes of mixing to obtain an alloy liquid ; Cool the alloy solution to 715°C and let it stand for 30 minutes.

[0064] Die-cast the above-mentioned alloy liquid after standing still on a cold chamber die-casting machine with a clamping force of 280 tons to obtain a high-temperature and high-pressure creep die-casting magnesium alloy. The die-casting temperature is 715°C, and the die-casting mold temperature is 240±...

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Abstract

The invention discloses a high-temperature-resistant and high-pressure-resistant creep die-casting magnesium alloy and a preparation method thereof and belongs to the technical field of magnesium alloys. The problem that the creep resistance of the magnesium alloy in the prior art cannot completely meet the use requirement in the environment at the temperature of 200 DEG C or above is solved. The magnesium alloy comprises the following components including by weight, 1% to 6% of Zn, 0.5% to 4% of La, 0.5% to 6% of Y, 0% to 0.5% of Zr, 0% to 0.5% of Mn and the balance magnesium and inevitable impurity elements. The magnesium alloy contains Zn, La and Y, the Zn, the La and the Y form a continuous net-shaped second-phase structure in three-dimensional space distribution after being melted, a second phase has multiple structures, dislocation slippage and twin crystal formation can be effectively hindered under the high-temperature condition, the high-temperature creep resistance of the alloy is improved, it is verified that at the temperature of 250 DEG C, the creep stress of the alloy is 80 MPa, the lasting creep life is longer than 300 h, and the steady-state creep rate is less than 6*10<-9> / s.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloys, and in particular relates to a high temperature and high pressure resistant creep die-casting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is an alloy composed of magnesium and other elements. It has the characteristics of low density, high specific strength, high specific stiffness, good damping and vibration reduction performance, good electromagnetic shielding performance, and excellent casting and machining performance. Therefore, it has important application value and broad application prospects in the fields of automobile, 3C, aerospace and national defense. [0003] In the prior art, the most widely used magnesium alloys are die-casting magnesium alloys, and the alloy systems are mainly concentrated in AZ (Mg-Al-Zn) series magnesium alloys and AM (Mg-Al-Mn) series magnesium alloys; but the two systems The performance of the high ...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03B22D17/08C22C23/06
CPCC22C23/04C22C1/03B22D17/08C22C23/06
Inventor 吕术慧杨强孟繁智
Owner CHANGCHUN UNIV OF SCI & TECH
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