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Refiner for magnesium-aluminum-based alloy and preparation method thereof

A magnesium-aluminum-based and refining agent technology, applied in the field of alloy refining agent and its preparation, can solve the problems of alloy corrosion performance influence, poor remelting effect, insignificant effect, etc., and achieve stable grain size and effect. Obvious, easy-to-prepare effect

Inactive Publication Date: 2011-11-23
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the refiners that have been developed are either insignificant, the remelting effect is not good, or they have a serious impact on the corrosion performance of the alloy.

Method used

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  • Refiner for magnesium-aluminum-based alloy and preparation method thereof
  • Refiner for magnesium-aluminum-based alloy and preparation method thereof
  • Refiner for magnesium-aluminum-based alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 0.01 g of Sr powder and 5 g of Sn powder with a particle size of 200 μm; 10 g of La powder and 10 g of Ce powder with a particle size of 100 μm; 10 g of high-purity graphite powder with a particle size of 200 μm, 10 g of Mg powder, and Al powder 54.99 g; the mass purity of Sr, Sn, RE is 99.9%; the mass purity of Al, Mg, high-purity graphite powder is 99%. Put the above raw materials into a ball mill, add 400 g of zirconia balls, and fill with argon to remove the air; the speed of the ball mill is 400 rpm; the ball milling time is 20 hours to prevent the temperature from being too high. Hour.

[0020] When in use, add 1 g of the above-mentioned refiner (Al-10Mg-0.01Sr-5Sn-20RE-10C) to 1Kg AZ31 magnesium-aluminum-based alloy melt, the particle size of the refiner is 0.1 μm, and add in 3 times, For each addition, stir with a molybdenum rod for 30 minutes to mix the molten materials evenly; control the temperature of the magnesium-aluminum-based alloy melt at 750°C un...

Embodiment 2

[0023] Take 5 g of Sr powder with a particle size of 100 μm, 0.01 g of Sn powder, 0.5 g of La powder with a particle size of 200 μm, 1 g of high-purity graphite powder with a particle size of 500 μm, 40 g of Mg powder, and 53.49 g of Al powder; , RE mass purity is 99.9%; Al, Mg, high-purity graphite powder mass purity is 99%. Put the above raw materials into a ball mill, add 1000g of zirconia balls, fill with argon gas to remove the air; the speed of the ball mill is 1500 rpm; the ball milling time is 40 hours to prevent the temperature from being too high. .

[0024] When in use, add 30 g of the above-mentioned refiner (Al-40Mg-5Sr-0.01Sn-0.5RE-1C) to 1Kg AM50 alloy melt. , Stir with a molybdenum rod for 60 minutes, and mix the smelting materials evenly; control the temperature of the AM50 alloy at 800°C until the raw materials are completely melted, after uniform mixing, stir for 30 minutes, and then pour after standing for 60 minutes.

[0025] Such as image 3 As shown, ...

Embodiment 3

[0027] Take 2 g of Sr powder and 1 g of Sn powder with a particle size of 180 μm; 4 g of La powder, 4 g of Ce powder, and 4 g of Nd powder with a particle size of 160 μm; 5 g of high-purity graphite powder with a particle size of 400 μm, 10 g of Mg powder, 70 g of Al powder; the mass purity of Sr, Sn, and RE is 99.9%, and the mass purity of Al, Mg, and high-purity graphite powder is 99%. Put the above raw materials into a ball mill, add 500 g of zirconia balls, and fill with argon to remove the air; the speed of the ball mill is 1500 rpm; the ball milling time is 30 hours to prevent the occurrence of excessive temperature. Hour.

[0028]When using, add 20g of the above-mentioned refiner (Al-10Mg-2Sr-1Sn-12RE-5C) to 1Kg AM50 magnesium-aluminum-based alloy melt, the particle size of the refiner is 0.5μm, and add it to the melt in 3 times During each addition, stir with a molybdenum rod for 40 minutes to evenly mix the molten materials; control the temperature of the magnesium-a...

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Abstract

The invention relates to a refiner for magnesium-aluminum-based alloy, which comprises the following chemical components in percentage by mass (wt.%): 0.01-5.0% of Sr, 0.01-5.0% of Sn, 0.5-20% of RE (rare earth), 1.0-10% of C, 10-40% of Mg and the balance of Al. The preparation method mainly comprises the following steps: carrying out ball milling for 20-40 hours, wherein the weight ratio of balls to raw material is (4-10):1, and the speed of the ball mill is 400-1500 rpm. The application method comprises the following steps: equally dividing the refiner into 3 parts, adding the 3 parts of refiner into a magnesium-aluminum-based alloy melt, and uniformly stirring with a molybdenum bar while controlling the melt temperature at 750-800 DEG C; and after finishing adding the refiner and stopping stirring, standing for 30-60 minutes, and casting. The invention has the advantages of simple preparation process, obvious action effects, stable refining and remelting effect; after the refiner is added into the magnesium-aluminum-based alloy, the grain size is uniformly (70-140 mu m); the grain size after remelting and casting is stable; and thus, the invention is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an alloy refiner and a preparation method thereof. Background technique [0002] With the rapid development of China's automobile industry and rail vehicles, magnesium alloys have been widely used. Casting and extrusion processing products are the main ways of magnesium alloy application at present. With the refinement of the magnesium alloy structure, the castability of the alloy is significantly improved, and the mechanical properties are significantly improved. At the same time, with the reduction of the grain size of the magnesium alloy, the distribution of the second phase and solute elements is more uniform, which can reduce the hot cracking tendency of the magnesium alloy and improve the processing performance of the magnesium alloy. The refined grain size is not only directly related to the properties of as-cast magnesium alloys, but also greatly affects the deformation properties of subsequent magnesium alloys [H.E. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/02
Inventor 彭秋明
Owner YANSHAN UNIV