Magnesium alloy strengthened with rare earth samarium and preparation method of magnesium alloy

A technology of magnesium alloy and master alloy, which is applied in the field of rare earth samarium-strengthened magnesium alloy and its preparation, can solve the problems of shortage of demand, soaring price, unbalanced development and utilization of rare earth elements, etc., and achieve excellent mechanical properties, low price and high cost of solution Effect

Inactive Publication Date: 2018-06-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the current development and utilization of rare earth elements is relatively unbalanced. Some elements such

Method used

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  • Magnesium alloy strengthened with rare earth samarium and preparation method of magnesium alloy
  • Magnesium alloy strengthened with rare earth samarium and preparation method of magnesium alloy
  • Magnesium alloy strengthened with rare earth samarium and preparation method of magnesium alloy

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preparation example Construction

[0071] The present invention also provides a method for preparing a magnesium alloy as described in any one of the above technical solutions, comprising the following steps:

[0072] 1) Under a protective atmosphere, cover the magnesium source with a magnesium alloy flux and then heat to obtain a molten magnesium source, heat the molten Mg source again, add Y source, Sm source and Zr source and mix to obtain a melt;

[0073] 2) under an inert atmosphere, after refining the melt obtained in the above steps, casting is carried out to obtain a magnesium alloy ingot;

[0074] 3) The magnesium alloy ingot obtained in the above steps is subjected to solution quenching and aging treatment to obtain a magnesium alloy.

[0075] The present invention compares the composition, category, state selection and addition ratio of the magnesium alloy material prepared in the above preparation process, and the corresponding optimization principles, with the corresponding material composition, ca...

Embodiment 1

[0111] 1) According to the composition ratio, Y: 5.5%; Sm: 2.9%; Zr: 0.6%; the balance is Mg, prepare raw materials, raw materials are magnesium source, Y source (20wt.% Mg-Y master alloy), Sm source (20wt.% Mg-Sm master alloy), Zr source (30wt.% Mg-Zr master alloy), and preheat the raw materials to 80-100°C;

[0112] 2) Preheat the iron crucible to 250°C, add magnesium source, and add No. 5 flux to cover to prevent excessive oxidation of magnesium at high temperature;

[0113] 3) After the magnesium source is completely melted, heat the melt in the iron crucible to 760°C, then add Y source, Sm source, and Zr source to it in batches, stir for 20 minutes, pass argon gas for refining, and then let stand for 40 minutes; It is cast into ingots by semi-continuous casting, and the sprue and crystallizer are fed with CO 2 and SF 6 A mixed gas with a volume ratio of 100:1 is used as a protective gas;

[0114] The magnesium alloy ingot prepared in Example 1 of the present invention ...

Embodiment 2

[0126] 1) According to the composition ratio, Y: 6.0%; Sm: 2.5%; Zr: 0.8%; the balance is Mg, prepare raw materials, raw materials are magnesium source, Y source (20wt.% Mg-Y master alloy), Sm source (20wt.% Mg-Sm master alloy), Zr source (30wt.% Mg-Zr master alloy), and preheat the raw materials to 80-100°C;

[0127] 2) Preheat the iron crucible to 200°C, add magnesium source, and add No. 5 flux to cover to prevent excessive oxidation of magnesium at high temperature;

[0128] 3) After the magnesium source is completely melted, heat the melt in the iron crucible to 750°C, then add Y source, Sm source, and Zr source to it in batches, stir for 20 minutes, refine with argon gas, and then let stand for 40 minutes; It is cast into ingots by semi-continuous casting, and the sprue and crystallizer are fed with CO 2 and SF 6 A mixed gas with a volume ratio of 100:1 is used as a protective gas;

[0129] 4) The obtained ingot is subjected to solution treatment in a vacuum heat treat...

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Abstract

The invention provides a magnesium alloy strengthened with rare earth samarium. The magnesium alloy is prepared from, by mass percent, 5.0% to 6.0% of Y, 2.5% to 3.5% of Sm, 0.4% to 0.8% of Zr and thebalance magnesium. According to the novel high-strength magnesium alloy, the rare earth Sm is selected for alloying the magnesium alloy, the maximum solid solubility of Sm in magnesium is higher thanthat of Nd with a good strengthening effect in magnesium. Due to the fact that Y and Sm are added, a large number of Mg24(Y,Sm)5 phases and Mg41(Sm,Y)5 phases are generated in the magnesium alloy, the precipitated phases can be completely redissolved into a base body in the solid solution treatment process, a supersaturated solid solution is formed, and then the supersaturated solid solution is subjected to artificial aging; and in the artificial aging process, the hardness is greatly improved, a very good solution strengthening and aging strengthening effect is achieved, and more excellent mechanical performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of rare earth magnesium alloy materials, and relates to a magnesium alloy and a preparation method thereof, in particular to a rare earth samarium-strengthened magnesium alloy and a preparation method thereof. Background technique [0002] Among the currently commonly used metal structural materials, the density of magnesium is the smallest, and the density of pure magnesium is 1.74g / cm 3 , compared to aluminum (2.7g / cm 3 ) and iron (7.87g / cm 3 ) are 1 / 3 and 3 / 4 lighter, respectively, and are the lightest metal among practical metals. They have the characteristics of high specific strength and high specific stiffness, and have good application prospects in industries that urgently need weight reduction. Magnesium alloy is an alloy based on magnesium and other elements, and it is also the lightest metal structure material in engineering applications. Its characteristics are: low density (the density of magn...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/002C22F1/06
Inventor 孟健邱鑫杨强孙伟牛晓东张德平田政管凯李柏顺
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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