High-strength cast magnesium alloy and preparation method thereof

A high-strength casting magnesium alloy technology, which is applied in the field of high-strength casting magnesium alloys and its preparation, can solve the problems of inability to prepare high-performance magnesium alloys, achieve the effects of inhibiting grain growth, inhibiting growth, and improving mechanical properties

Active Publication Date: 2022-08-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a high-strength cast magnesium alloy and its preparation method, which solves the problem that the prior art cannot prepare a high-performance magnesium alloy by adding a small amount of cheap light rare earth elements The problem

Method used

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  • High-strength cast magnesium alloy and preparation method thereof
  • High-strength cast magnesium alloy and preparation method thereof
  • High-strength cast magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Ingredients: prepare Zn 7.0%, Al 3.0%, Mg-5wt.% Mn 0.4%, RE 1.0%, the total amount of impurities less than 0.04%, the balance is Mg, where RE includes La and Ce, La and Ce They account for 35% and 65% of the total added amount of RE, respectively. La and Ce are added in the form of Mg-30wt.%La and Mg-30wt.%Ce master alloys. The above raw materials are polished, and the oxide film on the surface of the raw materials is polished. removed, and then dried.

[0037] (2) Put the dried Al, Mg-5wt.%Mn and Mg into the cleaned iron crucible first and smelt in the resistance furnace, the smelting temperature is controlled at 740°C, and the volume ratio is 99%: 1% during smelting CO 2 and SF 6 As a protective gas; after all the metals in the crucible are melted, Zn, Mg-30wt.%La and Mg-30wt.%Ce are finally added, and smelted for 20 minutes to initially obtain an alloy melt.

[0038] (3) Melt purification: After obtaining the preliminary alloy melt, RJ-6 refining agent is used...

Embodiment 2

[0042] (1) Ingredients: Prepare Zn 7.0%, Al 4.0%, Mg-5wt.% Mn 0.3%, RE 0.8%, the total amount of impurities less than 0.04%, the balance is Mg, where RE includes La and Ce, La and Ce They account for 35% and 65% of the total added amount of RE, respectively. La and Ce are added in the form of Mg-30wt.%La and Mg-30wt.%Ce master alloys. The above raw materials are polished, and the oxide film on the surface of the raw materials is polished. removed, and then dried.

[0043] (2) Put the dried Al, Mg-5wt.% Mn and Mg into a cleaned iron crucible and smelt in a resistance furnace, the smelting temperature is controlled at 750°C, and the volume ratio is 99%: 1% during smelting CO 2 and SF 6 As protective gas; after all the metals in the crucible are melted, Zn, Mg-30wt.%La and Mg-30wt.%Ce are finally added, and smelted for 18 minutes to initially obtain an alloy melt.

[0044] (3) Melt purification: After obtaining the preliminary alloy melt, RJ-6 refining agent is used to purify ...

Embodiment 3

[0048] (1) Ingredients: prepare Zn 7.0%, Al 5.0%, Mg-5wt.% Mn 0.5%, RE 0.5%, the total amount of impurities less than 0.04%, the balance is Mg, where RE includes La and Ce, La and Ce They account for 35% and 65% of the total added amount of RE, respectively. La and Ce are added in the form of Mg-30wt.%La and Mg-30wt.%Ce master alloys. The above raw materials are polished, and the oxide film on the surface of the raw materials is polished. removed, and then dried.

[0049] (2) Put the dried Al, Mg-5wt.%Mn and Mg into the cleaned iron crucible first and smelt in the resistance furnace, the smelting temperature is controlled at 760°C, and the volume ratio is 99%: 1% during smelting CO 2 and SF 6 As protective gas; after all the metals in the crucible are melted, Zn, Mg-30wt.%La and Mg-30wt.%Ce are finally added, and smelted for 15 minutes to initially obtain an alloy melt.

[0050] (3) Melt purification: After obtaining the preliminary alloy melt, RJ-6 refining agent is used t...

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Abstract

A high-strength cast magnesium alloy relates to the technical field of magnesium alloy material preparation, and comprises, by mass, 7.0% of Zn, 3.0%-5.0% of Al, 0.3%-0.5% of Mg-5wt.% Mn, 0.5%-1% of RE, inevitable impurities of which the total amount is less than or equal to 0.04%, and the balance Mg, the RE comprises La and Ce, and the La and the Ce respectively account for 35% and 65% of the total addition amount of the RE. Wherein Mn, La and Ce are added in the form of intermediate alloy of Mg-5wt.% Mn, the form of intermediate alloy of Mg-30wt.% La and the form of intermediate alloy of Mg-30wt.% Ce respectively; the preparation method comprises the following steps: preparing raw materials, smelting, purifying a melt, pouring and carrying out heat treatment, purifying the alloy melt and improving the corrosion resistance and casting performance of the alloy by adding RE, the tensile strength of the alloy is 300MPa-314MPa, the ductility is 7%-13%, the content of light rare earth is low, the raw material and processing cost is low, and large-batch production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy material preparation, in particular to a high-strength cast magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys are the lightest metal structural materials in practical applications. They play a significant role in achieving light weight, reducing energy consumption, and reducing environmental pollution. Industrial fields such as national defense, aerospace, electronics, and machinery have great prospects for development. However, the application of magnesium alloys is far less extensive than that of steel materials and aluminum alloys. This is mainly because magnesium alloys have key problems such as low absolute strength, insufficient toughness, high temperature creep resistance and poor corrosion resistance, which limit the development and development of magnesium alloys. application. [0003] Among them, Mg-Zn-Al alloys with high zinc cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
CPCC22C23/04C22C1/03C22F1/06Y02P10/20
Inventor 谭军何光明冉春华刘继江黄博炎戚宇马刚唐祖江周云轩李建波陈先华蒋斌潘复生
Owner CHONGQING UNIV
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