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High-strength and high-toughness cast rare earth magnesium alloy and preparation method thereof

A high-strength, high-toughness, rare-earth magnesium technology, applied in the field of light metal materials, can solve the problems of poor toughness, low strength of magnesium alloys, and poor heat resistance.

Inactive Publication Date: 2017-04-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength and high-toughness casting rare earth magnesium alloy and its preparation method in order to solve the problems of low strength, poor toughness and poor heat resistance of existing magnesium alloys

Method used

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  • High-strength and high-toughness cast rare earth magnesium alloy and preparation method thereof
  • High-strength and high-toughness cast rare earth magnesium alloy and preparation method thereof
  • High-strength and high-toughness cast rare earth magnesium alloy and preparation method thereof

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preparation example Construction

[0044] The present invention also provides a method for preparing a high-strength and high-toughness casting rare earth magnesium alloy, comprising the following steps:

[0045] Step 1. Proportioning the magnesium source, zinc source, ytterbium source and zirconium source according to the mass percentage of each component, removing the scale on the surface of the raw materials of each component and preheating to 200-300°C;

[0046] According to the present invention, the sources of the above-mentioned raw materials are not particularly limited, and they can be known sources in the field of rare earth magnesium alloy preparation. Generally, the source of magnesium is commercially available high-purity magnesium ingots, the source of zinc is high-purity zinc, and the source of ytterbium is ytterbium-15 % magnesium-ytterbium master alloy, zirconium is a magnesium-zirconium master alloy containing 30wt.% zirconium, and the mass percentage of magnesium is determined by high-purity m...

Embodiment 1

[0056] A high-strength and high-toughness casting Mg-Yb-Zn-Zr rare earth magnesium alloy, the mass percent of each component is: Yb 0.5%, Zn 0.4%, Zr 0.4%, and the balance is Mg and unavoidable impurity elements.

[0057] A method for preparing a high-strength and high-toughness casting Mg-Yb-Zn-Zr rare earth magnesium alloy, the steps are as follows:

[0058] Step 1. First, according to the composition of the Mg-Yb-Zn-Zr alloy and the mass percentage of each component, batching is carried out; the oxide skin on the surface of each component raw material is removed and preheated to 250°C;

[0059] Step 2. Preheat the iron tongs pot to 550°C, add high-purity magnesium ingots, set the furnace temperature to 720°C and feed SF 6 :CO 2 Protective gas with a volume ratio of 1:200;

[0060] Step 3. After the magnesium ingot is completely melted, when the measured melt temperature is 730°C, skim off the scum on the melt surface, add the above-mentioned pure zinc and magnesium-ytterb...

Embodiment 2

[0067] A high-strength and high-toughness casting Mg-Yb-Zn-Zr rare earth magnesium alloy, the mass percentage of each component is: Yb 1.0%, Zn 0.5%, Zr 0.5%, and the balance is Mg and unavoidable impurity elements.

[0068] A method for preparing a high-strength and high-toughness casting Mg-Yb-Zn-Zr rare earth magnesium alloy, the steps are as follows:

[0069] Step 1. First, according to the composition of the Mg-Yb-Zn-Zr alloy and the mass percentage of each component, batching is carried out; the oxide skin on the surface of each component raw material is removed and preheated to 250°C;

[0070] Step 2. Preheat the iron tongs pot to 550°C, add high-purity magnesium ingots, set the furnace temperature to 740°C and feed SF 6 :CO 2 Protective gas with a volume ratio of 1:200;

[0071] Step 3. After the magnesium ingot is completely melted, when the measured melt temperature is 740°C, skim off the scum on the surface of the melt, add the above-mentioned pure zinc and magnes...

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Abstract

The invention provides a high-strength and high-toughness cast rare earth magnesium alloy and a preparation method thereof and belongs to the field of light metal materials. The cast rare earth magnesium alloy comprises the following components in percentage by mass: 0.1-3.3% of Yb, 0.2-1.0% of Zn, 0.3-0.8% of Zr and the balance Mg and unavoidable impurity elements. The invention also provides the preparation method of the high-strength and high-toughness cast rare earth magnesium alloy. The rare earth magnesium alloy prepared by using the preparation method has relatively high mechanical property and heat resistance; and experimental results prove that the high-strength and high-toughness cast rare earth magnesium alloy prepared by using the preparation method has the room-temperature ultimate tensile strength of 185-205MPa and the percentage elongation after fracture of 15.3-23.6%; and after being subjected to T5 treatment (200 DEG C*22h), the room-temperature ultimate tensile strength of the alloy can reach 295-320MPa.

Description

technical field [0001] The invention belongs to the field of light metal materials, and in particular relates to a high-strength and high-toughness casting rare earth magnesium alloy and a preparation method thereof. Background technique [0002] As the lightest structural material at present, magnesium alloy has a density of about 1.74-1.90g / cm 3 , only 1 / 4 of steel, 2 / 3 of aluminum alloy. Compared with other metal materials, magnesium alloy has high specific strength, specific stiffness, good machinability, electromagnetic protection characteristics, damping performance and thermal conductivity, and is easy to recycle. In the current shortage of iron ore, titanium ore and aluminum ore resources, it has become an inevitable trend to develop and utilize magnesium resources as alternative materials. Therefore, magnesium alloy is known as "21st century commercial green environmental protection and ecological metal structure material", and is being widely used in the fields o...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C23/04C22C23/00C22C1/03
CPCC22C23/06C22C1/03C22C23/00C22C23/04
Inventor 孟健张德平张栋栋杨强管凯佟立波孙伟邱鑫田政牛晓东
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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