Mg-Zn-RE-Zr magnesium alloy and preparation method thereof

A magnesium alloy and alloy technology, which is applied in the field of Mg-Zn-RE-Zr series magnesium alloy and its preparation, can solve the problems of poor mechanical properties, easy generation of looseness and hot cracking, and reduction of solidus temperature, etc.

Active Publication Date: 2014-08-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of Zn content, the tensile strength and yield strength of MB26 alloy increased, and the elongation decreased slightly, but with the increase of Zn content, the solidus temperature of the alloy during solidification would decrease, especially when the Zn content was greater than At 4.5wt%, the casting process performance of MB26 alloy is poor, and it is prone to porosity and thermal cracking; and the addition of rare earth element Y or Y-rich compound increases the shrinkage of the solidified body of the alloy, and the casting thermal stress increases sharply, resulting in MB26 The alloy is prone to various casting defects during the casting process, especially casting cracks at the center or edge; at the same time, the phase transformation inside the alloy during the solidification of MB26 alloy increases the tensile strength and yield strength of the alloy, and also The formation of microcracks at the grain boundaries is increased, and the above reasons make the Mg-Zn-Zr series magnesium alloys provided by the prior art poor in mechanical properties and small in size

Method used

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preparation example Construction

[0024] The present invention provides a kind of preparation method of Mg-Zn-RE-Zr series magnesium alloy, comprises the following steps:

[0025] 1), melting and mixing Mg source, Zn source, Y source, Gd source, La source and Zr source to obtain alloy liquid;

[0026] 2) Casting the alloy liquid to obtain an as-cast alloy, the pouring temperature during the casting is 690°C-720°C, the pouring speed during the casting is 27mm / min-40mm / min, the casting The cooling rate is 1.8K / s~15K / s; the liquid cavity depth during casting is 160mm~320mm;

[0027] 3) Annealing the as-cast alloy to obtain a Mg-Zn-RE-Zr magnesium alloy, the temperature of the annealing is 230°C-320°C, and the time of the annealing is 8 hours-12 hours ;

[0028] The Mg-Zn-RE-Zr series magnesium alloy includes: 0.5wt%-1.2wt% Y, 0.4wt%-0.7wt% Gd, 0.2wt%-0.6wt% La, 4.5wt%-6.4wt% % Zn, 0.4wt%-0.7wt% Zr, the total amount of impurity elements <0.05wt%, and the balance is Mg.

[0029] The present invention uses Y sou...

Embodiment 1

[0050] Preheat 1565kg of Mg, 105kg of Zn, 160kg of Mg-Zr master alloy, 100kg of Mg-Y master alloy, 45kg of Mg-Gd master alloy and 25kg of Mg-La master alloy to 200°C;

[0051] At 680°C, put the above-mentioned preheated Mg into a melting furnace containing melted RJ-5 flux and melt it. After the Mg is completely melted, add the above-mentioned preheated Zn to the obtained Mg liquid to obtain The first mixed metal liquid;

[0052] At 760°C, add the above-mentioned preheated Mg-Y master alloy, Mg-Gd master alloy and Mg-La master alloy to the above-mentioned first mixed metal liquid to obtain a second mixed metal liquid;

[0053] Add the above-mentioned preheated Mg-Zr master alloy to the above-mentioned second mixed metal liquid at 780°C to obtain an alloy liquid;

[0054] Refining the alloy liquid by blowing argon, removing the argon, and removing the slag, and placing the alloy liquid after removing the slag in a standing furnace at 760°C for 1 hour;

[0055] in SF 6 gas an...

Embodiment 2

[0059] Preheat 1585kg of Mg, 100kg of Zn, 150kg of Mg-Zr master alloy, 90kg of Mg-Y master alloy, 40kg of Mg-Gd master alloy and 35kg of Mg-La master alloy to 180°C;

[0060] At 700°C, put the above-mentioned preheated Mg into a melting furnace containing melted RJ-5 flux and melt it. After the Mg is completely melted, add the above-mentioned preheated Zn to the obtained Mg liquid to obtain The first mixed metal liquid;

[0061] At 750°C, adding the above-mentioned preheated Mg-Y master alloy, Mg-Gd master alloy and Mg-La master alloy to the above-mentioned first mixed metal liquid to obtain a second mixed metal liquid;

[0062] Adding the above-mentioned preheated Mg-Zr master alloy to the above-mentioned second mixed metal liquid at 800°C to obtain an alloy liquid;

[0063] Refining the alloy liquid by blowing argon, removing the argon, and removing the slag, and placing the alloy liquid after removing the slag in a standing furnace at 770°C for 1.5 hours;

[0064] in SF ...

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Abstract

The invention provides a preparation method of a Mg-Zn-RE-Zr magnesium alloy, which comprises the following steps: 1) melting a Mg source, a Zn source, a Y source, a Gd source, a La source and a Zr source to obtain a molten alloy; 2) casting the molten alloy at 690-720 DEG C to obtain an as-cast alloy; and 3) carrying out annealing treatment at 230-320 DEG C on the as-cast alloy to obtain the Mg-Zn-RE-Zr magnesium alloy. The Y source, Gd source and La source are utilized to prepare the Mg-Zn-RE-Zr magnesium alloy; and by controlling the technological parameters in the Mg-Zn-RE-Zr magnesium alloy preparation process, the method provided by the invention can be used for preparing the Mg-Zn-RE-Zr magnesium alloy with favorable mechanical properties and large diameter.

Description

technical field [0001] The invention relates to the technical field of metal alloys, in particular to a Mg-Zn-RE-Zr series magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is a light-weight metal structure material with low density, high specific strength and specific stiffness, good damping performance, good electromagnetic shielding effect, excellent casting performance, and good processing performance. Magnesium alloys are widely used in aerospace and automotive industries. And 3C industries have broad application prospects. [0003] Magnesium alloys can be divided into Mg-Al series alloys, Mg-Mn series alloys and Mg-Zn-Zr series alloys according to their composition. The other two series of alloys. By adding rare earth element Y or Y-rich rare earth compounds to Mg-Zn-Zr series alloys, the comprehensive performance of Mg-Zn-Zr series alloys can be further improved, such as MB25 alloy and MB26 alloy, especially MB26 alloy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/02C22F1/06
Inventor 孟健邱鑫程丽任牛晓东杜海张德平张洪杰
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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