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Magnesium alloy grain refiner and grain refined magnesium alloy and preparation method of thereof

A technology for grain refinement and magnesium alloy, which is applied in the field of magnesium alloy grain refiner and grain refinement magnesium alloy and its preparation, can solve the problem of unstable magnesium alloy grain refinement, fluctuation of alloy composition, Difficult to control and other problems, to achieve stable grain refinement effect, high grain refinement efficiency, and avoid fluctuations

Inactive Publication Date: 2013-01-30
CHONGQING SUN MAGNESIUM COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They have been widely used in aluminum alloys and are commercially available, but after being added to magnesium alloys, excess aluminum elements will inevitably be introduced, causing fluctuations in the alloy composition, and the metal compound particles in these three kinds of intermediate alloys (such as Al 4 C 3 、TiB 2 , TiC, etc.) are infiltrated by the aluminum matrix, and when used in magnesium alloys, they have lost their activity with the magnesium melt to a certain extent, resulting in a decrease in grain refinement efficiency
In addition, the Mg-Al-C master alloy is also a commonly used master alloy, but it needs to add more carbon or carbon-containing substances to the Mg-Al alloy melt to form more Al 4 C 3 or Al 2 OC particles, therefore, the Mg-Al-C master alloy has the same disadvantages as the first type of carbon-containing material addition process. Carbon powder is not easy to add to the magnesium alloy melt and is not easy to react. Carbon-containing organic matter, carbonic acid compounds, carbon-containing Adding gas etc. to the magnesium alloy melt will cause certain pollution to the alloy melt and the content of the reaction product is not easy to control
This is different from the master alloy in which metal compound particles are added to the magnesium alloy. Part of the alloying elements added to the melt will react with aluminum or magnesium to form compounds, and some even form coarse compounds, resulting in alloy Effect of elements on grain refinement of magnesium alloys is unstable

Method used

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  • Magnesium alloy grain refiner and grain refined magnesium alloy and preparation method of thereof
  • Magnesium alloy grain refiner and grain refined magnesium alloy and preparation method of thereof

Examples

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Effect test

Embodiment 1

[0042] Example 1 Preparation of magnesium alloy without adding grain refiner

[0043] This example serves as a blank control example without adding a grain refiner.

[0044] The following formula is adopted, and it consists of the following components in terms of mass percentage: Al: 1.35%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%; Mg: the balance. Melting is carried out in a vacuum induction melting furnace, and pure magnesium and pure aluminum are put into a low-carbon steel crucible according to the formula. Before smelting, evacuate the furnace to a vacuum state, then pass in argon gas, and then start smelting. After the alloy is completely melted, keep it at 720°C for 30 minutes, and pass in argon gas for stirring, so that the added raw materials are fully alloyed.

[0045] Clean up the iron mold with an inner diameter of 85mm and a height of 350mm, and preheat it to 150°C and keep it warm for 20 minutes to make the temperature of the entire iron mold even. Then, the ...

Embodiment 2

[0046] Example 2 Preparation of Magnesium Alloy Added with Grain Refining Agent

[0047] The following formula is adopted, and it is composed of the following components in terms of mass percentage: Al: 1.35%; Ca: 1.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%; Mg: the balance. Melting is carried out in a vacuum induction melting furnace, and pure magnesium and Mg-Ca master alloy are put into a low-carbon steel crucible according to the formula amount. Before smelting, evacuate the furnace to a vacuum state, then pass in argon gas, and then start smelting. After the alloy is completely melted, add the formula amount of pure Al, keep it at 720°C for 30 minutes, and pass in argon gas for stirring, so that the added The raw materials are fully alloyed.

[0048] Clean up the iron mold with an inner diameter of 85mm and a height of 350mm, and preheat it to 150°C and keep it warm for 20 minutes to make the temperature of the entire iron mold even. Then, it was completely melted,...

Embodiment 3

[0050] Example 3 Preparation of Magnesium Alloy Added with Grain Refining Agent

[0051] The following formula is adopted, and it is composed of the following components in terms of mass percentage: Al: 3.0%; Ca: 2.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%; Mg: balance; melting in vacuum induction melting In the furnace, the pure Mg and the Mg-Ca master alloy are put into the low carbon steel crucible according to the corresponding addition amount. Before smelting, evacuate the furnace to a vacuum state, then pass in argon gas, and then start smelting. After the alloy is completely melted, add pure aluminum according to the proportion, keep it at 720°C for 30 minutes, and pass in argon gas for stirring, so that the added The raw materials are fully alloyed.

[0052] Clean up the iron mold with an inner diameter of 85mm and a height of 350mm, and preheat it to 200°C and keep it warm for 20 minutes to make the temperature of the entire iron mold uniform. Then, the alloy m...

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Abstract

The invention relates to a grain refiner for magnesium alloy, belonging to the field of alloy materials, in particular to the application of Al2Ca in preparing a grain refiner of magnesium alloy. The invention also relates to a grain refined type magnesium alloy, which comprises the following components by weight percent: 2.35-14.1% of Al2Ca, less than or equal to 0.3% and the balance of Mg. The preparation method of the magnesium alloy is as follows: heating Mg and Mg-Ca alloy of formula ratio to complete melting under conditions of vacuumizing and introducing inert gas; evenly stirring; adding pure Al of formula ratio; insulating heat until Al and Ca react completely; and cooling to obtain magnesium alloy containing Al2Ca, namely the grain refined type magnesium alloy. With respect to the grain refined type magnesium alloy prepared according to the method, the cast-condition crystallite dimension is 40 mu m which is obviously lower than the crystallite dimension of magnesium alloy in which the grain refiner is not added under the same condition, wherein the crystallite dimension of magnesium alloy without adding the grain refiner is 110 mu m.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to a magnesium alloy grain refiner, a grain refiner magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength, and good damping and vibration reduction performance. However, magnesium alloys have a wide solidification and crystallization temperature range, low thermal conductivity, serious grain coarsening tendency, and large volume shrinkage during solidification. , Defects such as shrinkage cavities, porosity, and hot cracks are prone to occur during the solidification process. [0003] Magnesium alloy grain refinement helps to reduce solidification defects, reduce the size of the second phase and improve casting defects, shorten the solution diffusion distance of the second phase particles at the grain boundary, and improve the efficiency of solution heat treatment, especially can sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20B22D21/04C22C23/00C22C1/06
Inventor 蒋斌汤爱涛张丁非彭建
Owner CHONGQING SUN MAGNESIUM COMPANY
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