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Grain refiner for rare earth magnesium alloy, preparation method and method for preparing rare earth magnesium alloy through grain refiner

A grain refiner and rare earth magnesium technology, applied in the field of grain refiner, can solve the problems of coarseness, unstable grain refinement, unable to meet the needs of rare earth magnesium alloy grain refinement, etc. The effect of refining ability, grain refining effect is remarkable, and the effect of small size

Inactive Publication Date: 2021-10-22
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, part of the alloying elements added to the melt will react with magnesium to produce compounds, and some can even form coarse compounds, resulting in unstable grain refinement of alloying elements on magnesium alloys
[0006] Therefore, it is urgent to develop a refiner that can effectively and stably refine the grains of rare earth magnesium alloys to solve the problem that the existing grain refinement process cannot meet the needs of rare earth magnesium alloy grain refinement

Method used

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  • Grain refiner for rare earth magnesium alloy, preparation method and method for preparing rare earth magnesium alloy through grain refiner
  • Grain refiner for rare earth magnesium alloy, preparation method and method for preparing rare earth magnesium alloy through grain refiner
  • Grain refiner for rare earth magnesium alloy, preparation method and method for preparing rare earth magnesium alloy through grain refiner

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preparation example Construction

[0028] According to a second aspect of the present invention, a method for preparing a grain refiner for a rare earth magnesium alloy is provided, comprising the following steps:

[0029] Step 1: Weigh Mg according to the mass percentage of the elements and put it into a vacuum induction furnace with an inert gas, heat it to 720-750°C and keep it warm until it is completely melted, then add Er and Zr according to the formula, and stir evenly at 800-820°C Fully alloy the elements to obtain an alloy melt;

[0030] Step 2, casting the molten alloy obtained in step 1 into a mold, and cooling the ingot to obtain a Mg-Er-Zr master alloy ingot;

[0031] Step 3, removing the head and tail of the ingot obtained in step 2, milling the skin, performing homogenization treatment at 520-550°C, and then extruding the ingot under the action of compressive stress to obtain the Mg-Er-Zr master alloy bar.

[0032] Further, in step 1, adding elements Er and Zr is implemented by adding Mg-30Er m...

Embodiment 1

[0042] The grain refiner for rare earth magnesium alloys in this embodiment is composed of three elements: Mg, Er, and Zr, and the mass content of impurities (such as Mn, Fe, Si, Ni, and Cu) is ≤0.3%.

[0043] Prepare the grain refiner for the rare earth magnesium alloy according to the following steps:

[0044] a) According to the formula of Er 10%, Zr 15% and the balance of Mg according to the mass percentage of the elements, take Mg and put it into a vacuum induction furnace with an inert gas, heat it to 720°C and keep it until it is completely melted, and then add it according to the formula Er and Zr, the addition of elements Er and Zr is implemented by adding Mg-30Er and Mg-30Zr master alloys, stirring evenly at 780°C to fully alloy the elements to obtain alloy melts;

[0045]b) Clean the iron mold with an inner diameter of 85mm and a height of 350mm, preheat it to 300°C, and keep it warm for 10 minutes to make the temperature of the entire mold uniform. Then, the alloy...

Embodiment 2

[0059] The grain refiner for rare earth magnesium alloys in this embodiment is composed of three elements: Mg, Er, and Zr, and the mass content of impurities (such as Mn, Fe, Si, Ni, and Cu) is ≤0.3%.

[0060] Prepare the grain refiner for the rare earth magnesium alloy according to the following steps:

[0061] a) According to the formula of Er 10%, Zr 15% and the balance of Mg according to the mass percentage of elements, take Mg and put it into a vacuum induction furnace with an inert gas, heat it to 720°C and keep it until it is completely melted, then add Er according to the formula And Zr, the addition of elements Er and Zr is realized by adding Mg-30Er and Mg-30Zr master alloys, stirring evenly at 780°C to fully alloy the elements to obtain alloy melts;

[0062] b) Clean the iron mold with an inner diameter of 85mm and a height of 350mm, preheat it to 300°C, and keep it warm for 10 minutes to make the temperature of the entire mold uniform. Then, the alloy melt that wa...

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Abstract

The invention provides a grain refiner for a rare earth magnesium alloy, a preparation method and a method for preparing the rare earth magnesium alloy through the refiner. The grain refiner is composed of three elements, namely, Mg, Er and Zr, the mass content of the Er element is 5-20%, the mass content of Zr is 5-20%, the balance is Mg, and the mass content of impurities is smaller than or equal to 0.3%. The grain refiner is prepared through smelting in a vacuum induction furnace in proportion, element burning loss is effectively avoided, the component controllability is high, the Zr can be dispersed and distributed in a matrix through extrusion processing, the size is small, and the refining capacity is further improved. In addition, Mg-Gd-Y series rare earth magnesium alloy grains are refined according to the formula and the process disclosed by the invention, the as-cast grain size of the obtained magnesium alloy is 50 microns, and the grain refining effect is remarkable compared with the grain size, being 120 microns, of the magnesium alloy without using the grain refiner in the same state.

Description

technical field [0001] The invention belongs to the technical field of grain refiners, and in particular relates to a grain refiner for Mg-Gd-Y series magnesium alloys, a preparation method of the refiner and preparation of fine-grained rare earth magnesium alloys using the refiner Methods. Background technique [0002] Mg-Gd-Y series magnesium alloy is a commonly used rare earth magnesium alloy, which has high specific strength, specific stiffness, excellent casting performance and machinability, but poor strength and toughness. By Hall-patch (σ=σ 0 +Kd -1 / 2 ) shows that for magnesium alloys with larger K values, grain refinement is an effective method for alloy strengthening and toughening. [0003] Currently, the grain refinement of rare earth magnesium alloys is mainly achieved by adding alloying elements. The most effective grain refiner is Zr. However, Zr has a high melting point, high density, and limited solid solubility in magnesium. In the temperature range of ...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C1/03C22C23/06
CPCC22C1/06C22C1/03C22C23/06
Inventor 肖旅季松陈舸王煜烨汪彦博王世伟庞松龚政轩别亚星江善尧
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST