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Magnesium-base rare-earth alloy material and preparation method thereof

A technology of rare earth alloys and master alloys, applied in the field of metal materials, can solve the problems of increasing the production cost of superplastic forming of magnesium alloys and the feasibility of large-scale application, obtaining fine-grained magnesium alloys, and difficulty in realizing them, so as to improve superplastic forming effect of ability

Inactive Publication Date: 2012-08-08
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a small grain size is difficult to achieve in industry, and fine-grained magnesium alloys are difficult to obtain by conventional methods, and are generally obtained by rapid solidification powder metallurgy technology or equal-channel extrusion.
These reasons have greatly increased the production cost and feasibility of large-scale application of superplastic forming of magnesium alloys.

Method used

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  • Magnesium-base rare-earth alloy material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition (mass percentage) of the alloy is: 8.4% Y, 0.9% Er, 1.9% Zn, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0025] The melting, casting and processing technology for preparing the alloy is as follows: first, weigh the materials according to the proportion, preheat the Mg, Zn, Mg-Y master alloy, and Mg-Er master alloy to 200°C, and then put Mg into the crucible preheated to 100°C in, and pass into SF 6 :CO 2 Protective gas with a volume ratio of 1:100, add Zn after the Mg is completely melted, add Mg-Y master alloy and Mg-Er master alloy when the melt temperature reaches 740°C, and pass in argon after the added master alloy is melted Refining and stirring for 10 minutes, after removing slag, let it stand at 740°C for 25 minutes, and after the temperature drops to 700°C, cast it into a round bar with a water-cooled mold. The obtained cast rod was homogenized at 450°C for 10 hours, then air-coole...

Embodiment 2

[0029] The chemical composition (mass percentage) of the alloy is: 7.0% Y, 2.2% Er, 2.3% Zn, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0030] The melting, casting and processing technology for preparing the alloy is as follows: first, weigh the materials according to the proportion, preheat the Mg, Zn, Mg-Y master alloy, and Mg-Er master alloy to 250°C, and then put Mg into the crucible preheated to 120°C in, and pass into SF 6 :CO 2 Protective gas with a volume ratio of 1:100, add Zn after the Mg is completely melted, add Mg-Y master alloy and Mg-Er master alloy when the melt temperature reaches 750°C, and pass in argon after the added master alloy is melted Refining and stirring for 15 minutes, after removing the slag, let it stand at 740°C for 45 minutes, and after the temperature drops to 710°C, cast it into a round bar with a water-cooled mold. The obtained cast rod was homogenized at 480°C for 10 hours, then air-coo...

Embodiment 3

[0034] The chemical composition (mass percentage) of the alloy is: 9.7% Y, 2.5% Er, 2.9% Zn, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0035] The melting, casting and processing technology for preparing the alloy is as follows: first, weigh the materials according to the proportion, preheat Mg, Zn, Mg-Y master alloy, and Mg-Er master alloy to 240°C, and then put Mg into the crucible preheated to 120°C in, and pass into SF 6 :CO 2 Protective gas with a volume ratio of 1:100, add Zn after Mg is completely melted, add Mg-Y master alloy and Mg-Er master alloy when the melt temperature reaches 760°C, and pass in argon after the added master alloy is melted Refining and stirring for 15 minutes, after removing slag, let it stand at 750°C for 30 minutes, and after the temperature drops to 720°C, cast it into a round bar with a water-cooled mold. The obtained cast rods were homogenized at 480°C for 15 hours, then air-cooled, and...

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Abstract

The invention provides a magnesium-base rare-earth alloy material and a preparation method thereof. The magnesium-base rare-earth alloy material comprises the components by weight percent: 7.0-1.0% of Y, 1.0-2.5% of Er, 2.0-3.0% of Zn, less than 0.03% of inevitable impurities of Fe, Cu, Ni and Si, and the balance of Mg. The methods of conventional smelting, homogenizing treatment, hot extrusion treatment, and the like, are adopted by the invention, and meanwhile a superplastic magnesium rare-earth alloy material with high strain rate is obtained. Under lower temperature (300-380 DEG C), the alloy has high strain rate (0.8*10-2-1*10-2s-1) and superplasticity, the coefficient of elongation of the alloy after being broken is 350%-520%. The production cost is effectively lowered, the production efficiency is increased, the operation is easily performed and the magnesium-base rare-earth alloy material is beneficial to large-scale application and popularization.

Description

technical field [0001] The invention relates to a metal material, in particular to a high strain rate superplastic magnesium-rare earth alloy. The invention also relates to a preparation method of high strain rate superplastic magnesium-rare earth alloy. Background technique [0002] The production of magnesium and magnesium alloys in China has good economics and competitiveness. According to experts' prediction, the next few decades will be a period of rapid growth in the production and consumption of magnesium alloys in my country. The inevitable way for the magnesium industry. my country is a country with a large magnesium resource, and it is also a huge potential application market for products such as automobiles, electronic communications, and aerospace. Therefore, it is of great significance to further tap the performance potential of magnesium materials (such as superplastic forming of magnesium alloys) and broaden the application fields of magnesium alloys. [000...

Claims

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Application Information

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IPC IPC(8): C22C23/06
Inventor 冷哲张景怀巫瑞智张密林姜凤春朱天龙刘旭贺崔崇亮
Owner HARBIN ENG UNIV
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