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High-strength casting magnesium alloy with low hot cracking tendency and preparation method for high-strength casting magnesium alloy

A technology for casting magnesium alloys and magnesium alloys, which is applied in the fields of low thermal cracking tendency, high-strength casting magnesium alloys and their preparation, magnesium alloys and their preparations, and can solve problems such as damage to alloy strength and high temperature resistance, thin-wall thermal cracks, and casting fractures , to achieve the effect of improving alloy casting performance, improving hot cracking resistance, and low casting hot cracking tendency

Inactive Publication Date: 2015-04-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the Mg-10Gd-3Y-Zr alloy is used to produce small-sized castings, hot crack defects often appear at the thin-walled parts, resulting in the scrapping of the castings; At the corner, the casting often breaks directly due to thermal cracking. It can be seen that the high thermal cracking tendency seriously limits the application of this high-strength heat-resistant magnesium alloy.
It can be seen from the above that reducing the oxidation inclusions and ensuring the purification of the melt can improve the hot cracking resistance of the alloy; reducing the content of Gd and Y elements can also reduce the hot cracking tendency of the alloy, but the reduction of heavy rare earth elements Gd and Y will Seriously damage the strength and high temperature resistance of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment relates to a low thermal cracking tendency high-strength cast magnesium alloy, the alloy composition (weight percentage) is: Gd 8wt.%, Y 2wt.%, Ce-rich mixed rare earth RE 1.5wt.%, Ag 1.5wt.%, Ca 1wt. .%, Zr 0.6wt.%, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0027] Among them, Ce-rich mixed rare earth RE contains 51.5wt.% Ce, 32wt.% La, 12wt.% Pr, 3.7wt.% Nd, and 99.2wt.% total rare earth metal. %.

[0028] The alloy melting process is:

[0029] Prepare the alloy according to the above ingredients, first preheat the magnesium ingot, Mg-Gd, Mg-Y, Mg-Zr master alloy and Ce-rich mixed rare earth RE to 200 ° C, and then place the magnesium ingot in SF 6 and CO 2 Heating under the protection of mixed gas (SF6 volume content is 2.5Vol.%), after the magnesium ingot is completely melted, add pure Ca at 680°C, then raise the temperature to 730°C and add Ce-rich mixed rare earth RE, when the temperat...

Embodiment 2

[0032] This example relates to a high-strength cast magnesium alloy with low thermal cracking tendency. The alloy composition (weight percentage) is: Gd 9wt.%, Y 3wt.%, Ce-rich mixed rare earth RE 1wt.%, Ag 1wt.%, Ca 0.5wt. %, Zr 0.5wt.%, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0033] Among them, the Ce-rich mixed rare earth RE contains 62wt.% of Ce, 30wt.% of La, 5wt.% of Pr, 2.5wt.% of Nd, and 99.5wt.% of the total amount of rare earth metals .

[0034] The alloy melting process is:

[0035] Prepare the alloy according to the above ingredients. First, preheat the magnesium ingot, Mg-Gd, Mg-Y, Mg-Zr master alloy and Ce-rich mixed rare earth RE to 220°C, and then heat the magnesium ingot under the protection of flux until the magnesium ingot is completely After melting, add pure Ca at 700°C, then raise the temperature to 720°C and add Ce-rich mixed rare earth RE, when the temperature of the magnesium liquid reac...

Embodiment 3

[0038] This embodiment relates to a low thermal cracking tendency high-strength cast magnesium alloy, the alloy composition (weight percentage) is: Gd 10wt.%, Y 4wt.%, Ce-rich mixed rare earth RE 0.5wt.%, Ag 0.5wt.%, Ca 0.2 wt.%, Zr 0.4wt.%, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0039] Among them, the Ce-rich mixed rare earth RE contains 55wt.% of Ce, 35wt.% of La, 6wt.% of Pr, 3.3wt.% of Nd, and 99.3wt.% of the total amount of rare earth metals. .

[0040] The alloy melting process is:

[0041] Prepare the alloy according to the above ingredients, first preheat the magnesium ingot, Mg-Gd, Mg-Y, Mg-Zr master alloy and Ce-rich mixed rare earth RE to 240 °C, and then place the magnesium ingot in SF 6 and CO 2 Heating under the protection of mixed gas (SF6 volume content is 0.5Vol.%), after the magnesium ingot is completely melted, add pure Ca at 680°C, then raise the temperature to 720°C and add Ce-rich mixed r...

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Abstract

The invention discloses a high-strength casting magnesium alloy with low hot cracking tendency and a preparation method for the high-strength casting magnesium alloy. The magnesium alloy is prepared from the following components in percentage by weight: 8-10wt.% of Gd, 2-4wt.% of Y, 0.1-1.5wt.% of Ce-rich mixed rear earth RE, 0.1-1.5wt%.% of Ag, 0.1-1wt.% of Ca, 0.3-0.7wt.% of Zr, less than 0.02wt.% of impurity elements Si, Fe, Cu and Ni, and the balance of Mg. The magnesium alloy disclosed by the invention is obtained by smelting as well as follow-up solid-solution and ageing thermal treatment (T6 treatment). In case of guaranteeing the room-temperature high-temperature performances of the Mg-Gd-Y-series magnesium alloys, the thermal cracking resistance in an alloy casting process is greatly improved, and therefore, the high-strength casting magnesium alloy is more suitable for producing thin-wall, complex-structured and large and medium-sized structural components with light-weight and high-strength requirements, and has a wide industrial application prospect.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a high-strength cast magnesium alloy with low thermal cracking tendency and a preparation method thereof. It belongs to the field of metal materials and metallurgy. Background technique [0002] Magnesium alloy is the lightest metal structural material. Its application in aviation, aerospace and other national defense fields can greatly reduce the weight of aircraft, reduce fuel consumption, and improve carrying capacity. It has extremely high economic value and strategic significance. At present, magnesium alloys have developed a variety of series such as Mg-Al, Mg-Zn, Mg-RE and Mg-Zn-RE. Among them, Mg-RE series magnesium alloys have excellent strength and creep resistance at high temperatures. Aviation and aerospace fields have been widely used, such as EK41 and QE22 used in aero-engines, WE43 and WE54 used in missiles, etc. At present, the researched and...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03
CPCC22C23/06C22C1/03
Inventor 吴国华张亮刘文才魏广玲丁文江
Owner SHANGHAI JIAO TONG UNIV
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