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Multicomponent heat-resistant magnesium alloy for car and its founding process

A magnesium alloy, multi-component technology, applied in the composition formula of cheap heat-resistant magnesium alloy and its melting and casting process, multi-component heat-resistant magnesium alloy for automobiles and its melting and casting process, can solve the problem of low room temperature tensile strength and yield strength, which limits the application of alloys Range, poor casting performance, etc.

Inactive Publication Date: 2002-03-27
SHANGHAI HAOHUA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the creep strength of AS21 (Mg-2Al-1Si) magnesium alloy is better than that of AS41 magnesium alloy. However, due to the low Al content, the room temperature tensile strength and yield strength of the alloy are lower than those of AZ91 and AM60, and the casting performance is also worse.
In addition, due to the main strengthening phase Mg in the alloy 2 Si will become thick "Chinese characters" under the condition of slow solidification, which will seriously damage the performance of the alloy
Although it has been reported in the literature that Ca can improve Mg 2 The morphology of Si, but the addition of Ca also increases the hot cracking tendency of the alloy
So contains Mg 2 Magnesium alloys with Si strengthening phase can only be used in die-casting production with fast solidification speed, but not sand casting, which limits the scope of application of the alloy
Although the AE42 alloy has the same creep strength as the AS21 alloy, its material cost is higher and it has a higher tendency of casting hot cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Alloy composition (weight percent): 5.0% Al, 0.9Zn, 0.6Si, 0.5Sb, 0.1RE, 0.003Be, impurity elements Fe≤0.005%, Cu≤0.015%, Ni≤0.002, and the rest are Mg.

[0013] Configure the alloy according to the above ingredients, add 15kg of industrial pure magnesium to the resistance crucible furnace, and sprinkle a small amount of covering agent (JDF) 0.3Kg on the bottom of the crucible. After the alloy is completely melted, add 0.52Kg of industrial pure aluminum and 0.15Kg of industrial pure zinc. , Al-25Si master alloy 0.39Kg, industrial pure antimony 0.12Kg (by 70% yield), Mg-10RE master alloy 0.24Kg (by 70% yield), Al-3Be master alloy 0.01Kg, wait After all the alloying elements are dissolved, stir it with a tool to make it evenly mixed, continue to raise the temperature to 710°C-730°C, and refine the alloy liquid with 0.4Kg of refining agent for 10 minutes. The refined magnesium liquid has a silvery white mirror surface, and the magnesium liquid does not sticky stirring tool...

Embodiment 2

[0015] Alloy composition (weight percent): 6.0% Al, 1.0Zn, 0.7Si, 0.4Sb, 0.2RE, 0.002Be, impurity elements Fe≤0.005%, Cu≤0.015%, Ni≤0.002, and the rest are Mg.

[0016] Configure the alloy according to the above ingredients, add 15 kg of industrial pure magnesium into the resistance crucible furnace, and use FS 6 0.5% / CO 2 Mixed gas protection, after the alloy is completely melted, add 0.66Kg of industrial pure aluminum, 0.16Kg of industrial pure zinc, 0.46Kg of Al-25Si master alloy, 0.1Kg of industrial pure antimony, 0.5Kg of Mg-10RE master alloy, Al-3Be master alloy 0.01Kg, after all the alloying elements are dissolved, continue to raise the temperature to 710°C-730°C, stir with argon and start to refine the alloy liquid with refining agent, the amount of refining agent is 0.5kg, the time is 10 minutes, the refined magnesium The liquid has a silver-white mirror surface, and the magnesium liquid does not adhere to the Ar trachea. Then heat preservation and stand still for 2...

Embodiment 3

[0018] Alloy composition (weight percent): 7.0% Al, 0.8Zn, 0.8Si, 0.6Sb, 0.2RE, 0.002Be, impurity elements Fe≤0.005%, Cu≤0.015%, Ni≤0.002, and the rest are Mg.

[0019] Configure the alloy according to the above ingredients, add 15 kg of industrial pure magnesium into the resistance crucible furnace, and sprinkle a small amount of covering agent 0.4Kg on the bottom of the crucible. After the alloy is completely melted, add 0.76Kg of industrial pure aluminum, 0.13Kg of industrial pure zinc, Al- 0.53Kg of 25Si master alloy, 0.13Kg of industrial pure antimony, 0.5Kg of Mg-10RE master alloy, and 0.01Kg of Al-3Be master alloy. After all the alloy elements are dissolved, stir them with tools to make them evenly mixed and continue to raise the temperature to 710℃- Refining the alloy liquid with 0.5Kg of refining agent at 730°C for 10 minutes. Then keep it warm for 20 minutes, remove the scum on the surface, and then use the ladle to carry out sand casting. During the casting process,...

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Abstract

The present invention relates to a multicomponent heat-resisting magnesium alloy which can be extensively used in engine component of car, minibus and motorcycle and its casting process. Its composition formula includes (wt%) Al 5-7, Zn 5-1.0, Si 0.6-1.5, Sb 0.4-0.7, RE 0.1-0.3, Be 0.002%, and impurity elements Fe is less than 0.005%, Cu is less than 0.015 % and Ni is less than 0.002% and the rest is Mg. Its casting process is characterized by that under the condition of smelting with flux or gas protection completely melting industrial pure magnesium, then respectively adding alloy elements of Al, Zn, Si, Sb, RE and Be in the form of industrial pure aluminium, industrial pure zinc, Al-Si intermediate alloy, industrial pure stibium, Mg-RE intermediate alloy and Al-Be intermediate alloy, dissolving them completely, uniformly stirring, refining and casting. The microstructure of the invented cast alloy is obviously refined, and the room-temp. and high-temp. tensile strength, yield strength and percentage elongation of the alloy also can be raised.

Description

Technical field: [0001] The invention relates to a multi-component heat-resistant magnesium alloy for automobiles and its melting and casting process, which relates to a composition formula of a cheap heat-resistant magnesium alloy with high heat resistance and its melting and casting process, and belongs to the field of metal materials and metallurgy. Background technique: [0002] In order to reduce the weight of cars / mini-cars, improve fuel efficiency, and reduce environmental pollution caused by exhaust emissions, the automobile industry increasingly uses parts made of light alloys. As the lightest metal structural material, magnesium alloy has high specific strength, specific stiffness, good vibration damping performance and casting performance, and has become the preferred weight-reducing material in the automotive industry. However, the application of magnesium alloy products in automobiles is still very limited, especially the use of magnesium alloys in engine parts ...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C23/02
Inventor 袁广银丁文江
Owner SHANGHAI HAOHUA MOLD
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