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Superplastic high-strength heatproof magnesium alloy and preparation method thereof

A magnesium alloy and superplastic technology, which is applied to the preparation of magnesium-based alloys, high-strength and heat-resistant magnesium alloys and the fields of their preparation, can solve problems such as affecting the hot-working formability of alloys, and achieves advantages of large-scale popularization and application, easy operation, The effect of improving mechanical properties

Inactive Publication Date: 2015-05-27
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of strengthening the alloy will inevitably affect the hot forming properties of the alloy, especially the superplastic forming ability of the alloy.

Method used

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  • Superplastic high-strength heatproof magnesium alloy and preparation method thereof
  • Superplastic high-strength heatproof magnesium alloy and preparation method thereof
  • Superplastic high-strength heatproof magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical composition (mass percentage) of the alloy is: 6.0%Y, 2.0%Nd, 1.8%Zn, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0024] 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-Nd 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-Nd 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-cooled, and ...

Embodiment 2

[0030] The chemical composition (mass percentage) of the alloy is: 5.8%Y, 2.5%Nd, 2.6%Zn, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0031] 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-Nd master alloy to 250°C, and then put Mg into the crucible preheated to 120°C in, and pass into SF 6 :CO 2Protective gas with a volume ratio of 1:100, add Zn after the Mg is completely melted, add Mg-Y master alloy and Mg-Nd 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-coole...

Embodiment 3

[0038] The chemical composition (mass percentage) of the alloy is: 7.2%Y, 0.8%Nd, 3%Zn, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0039] 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-Nd 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 the Mg is completely melted, add Mg-Y master alloy and Mg-Nd 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 superplastic high-strength heatproof magnesium alloy and a preparation method thereof. The method which treats pure Mg, pure Zn an Mg-Y intermediate alloy and an Mg-Nd intermediate alloy as raw materials comprises the following steps: melting alloy elements, refining, removing slag, allowing the obtained mixture to stand at a constant temperature, cooling through utilizing a water cooling die to obtain magnesium alloy cast bars, carrying out high temperature homogenization treatment, and carrying out hot extrusion molding on an extruder to obtain the superplastic high-strength heatproof magnesium alloy, wherein the superplastic high-strength heatproof magnesium alloy includes 5.0-8.0mass% of Y, 0.5-2.5mass% of Nd, 1.5-3.5mass% of Zn, below 0.03mass% of inevitable Fe, Cu, Ni and Si impurities, and the balance Mg. The superplastic high-strength heatproof magnesium alloy has a high strength of 230-350MPa and a good plasticity of 10-30% at a temperature in a range of room temperature to 300DEG C, and has a superplastic characteristic and an elongation rate after break of 270-600% at a temperature in a range of 350-450DEG C.

Description

technical field [0001] The invention relates to a magnesium-based alloy, and the invention also relates to a preparation method of the magnesium-based alloy. It specifically relates to a high-strength heat-resistant magnesium alloy with superplastic properties and a preparation method thereof. Background technique [0002] Magnesium alloys have low density, high specific strength and specific stiffness, and good impact resistance, and are widely used in automobiles, aerospace and other industries. However, many current component applications require materials with good heat resistance. For example; the transmission system and engine of the automobile require its manufacturing materials to have excellent mechanical properties at a temperature of 200°C to 300°C. In addition, in the subsequent processing methods of metal materials, superplastic processing and forming technology has gained broad market application prospects because it can be processed into complex, precise and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
Inventor 冷哲张景怀尹婷婷张丽费鹏飞林华益张密林巫瑞智
Owner HARBIN ENG UNIV
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