High-intensity heat-resistant magnesium alloy material and preparation process thereof

A preparation process, magnesium alloy technology, applied in the field of metal materials and metallurgy, can solve the problems of limited commercial application, high cost, high amount of rare earth added, etc., achieve high temperature strength, low rare earth content, and reduce costs

Inactive Publication Date: 2011-08-17
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in CN1814837A, the heat-resistant magnesium alloy invented by Li Daquan and others contains 2-6% Sm and 3-12% Y, and in CN101463441A such as Wang Qudong, the heat-resistant magnesium alloy contains 2-10% Gd and 3-16% Y Although the mechanical properties of this type of heat-resistant magnesium alloy are relatively high, the amount of rare earth added is relatively high (generally greater than 4%), and the cost is high, which greatly limits its commercial application

Method used

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  • High-intensity heat-resistant magnesium alloy material and preparation process thereof
  • High-intensity heat-resistant magnesium alloy material and preparation process thereof
  • High-intensity heat-resistant magnesium alloy material and preparation process thereof

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Experimental program
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Effect test

Embodiment 1

[0024] The composition (percentage by weight) of the high-strength heat-resistant magnesium alloy material is: 7.5% Al, 0.8% Zn, 0.02% B, 1% Nd, 0.8% Gd, 0.2% Mn, the total amount of impurity elements Si, Fe, Cu, Ni Less than 0.02%, the balance is Mg.

[0025] Alloys are formulated according to the above ingredients, and the melting and casting process is as follows: first, preheat pure magnesium ingots, aluminum ingots, zinc ingots, Al-B master alloys, Mg-Nd master alloys, and Mg-Gd master alloys to 160 ° C, and then pure magnesium , aluminum ingots, and manganese flakes are placed in CO 2 / SF 6 Melt in a gas-protected melting furnace, stir evenly after melting, add Mg-Nd master alloy when the temperature reaches 720°C, and then add Mg-Gd master alloy when the temperature of the Mg-Nd master alloy melted magnesium liquid rises to 730°C, and the magnesium liquid Raise to 750°C and add Al-B master alloy, stir for 3-5 minutes after it melts, remove the surface scum and let it ...

Embodiment 2

[0028] The composition (percentage by weight) of the high-strength heat-resistant magnesium alloy material is: 8.5% Al, 1.2% Zn, 0.03% B, 1.5% Nd, 1.0% Gd, 0.3% Mn, the total amount of impurity elements Si, Fe, Cu, Ni Less than 0.02%, the balance is Mg.

[0029] Alloys are formulated according to the above ingredients, and the melting and casting process is as follows: first, preheat pure magnesium ingots, aluminum ingots, zinc ingots, Al-B master alloys, Mg-Nd master alloys, and Mg-Gd master alloys to 200 ° C, and then pure magnesium , aluminum ingots, and manganese flakes are placed in CO 2 / SF 6 Melt in a gas-protected melting furnace, stir evenly after melting, add Mg-Nd master alloy when the temperature reaches 730°C, and then add Mg-Gd master alloy when the temperature of Mg-Nd master alloy melting magnesium liquid rises to 730°C, and the magnesium liquid Raise to 760°C and add Al-B master alloy, stir for 3-5 minutes after it melts, remove the surface scum and let it s...

Embodiment 3

[0032] The composition (percentage by weight) of the high-strength heat-resistant magnesium alloy material is: 9.1% Al, 1.5% Zn, 0.05% B, 0.8% Nd, 1.5% Gd, 0.25% Mn, the total amount of impurity elements Si, Fe, Cu, and Ni Less than 0.02%, the balance is Mg.

[0033] Alloys are formulated according to the above ingredients, and the melting and casting process is as follows: first, preheat pure magnesium ingots, aluminum ingots, zinc ingots, Al-B master alloys, Mg-Nd master alloys, and Mg-Gd master alloys to 180 ° C, and then pure magnesium , aluminum ingots, and manganese flakes are placed in CO 2 / SF 6 Melt in a gas-protected melting furnace, stir evenly after melting, add Mg-Nd master alloy when the temperature reaches 725°C, and then add Mg-Gd master alloy when the temperature of the Mg-Nd master alloy melted magnesium liquid rises to 730°C, and the magnesium liquid Raise to 770°C and add Al-B master alloy, stir for 3-5 minutes after it melts, remove the surface scum and ...

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Abstract

The invention relates to a high-intensity heat-resistant magnesium alloy material and a preparation process thereof. The material comprises the following components in percentage by mass: 6-10 percent of Al, 0.5-2 percent of Zn, 0.02-0.3 percent of B, 0.2-1.5 percent of Nd, 0.2-1.5 percent of Gd, 0.1-0.6 percent of Mn, less than or equal to 0.02 percent of impurity element Si, less than or equal to 0.003 percent of Fe, less than or equal to 0.01 percent of Cu and the balance of Mg. The process comprises the following steps of: adding Gd, Nd and B into magnesium melt in sequence in the form of intermediate alloy during smelting; casting into a metal mold; and performing solution treatment and aging heat treatment on the obtained alloy to obtain the material. In the preparation process, B is used for replacing rare earth partially, so that the content of rare earth is low, and the cost is lowered; and the preparation process contributes to the microalloying action, so that the material has higher high-temperature intensity and can be taken as an automobile part and other structural material with higher service temperature.

Description

technical field [0001] The invention relates to a magnesium alloy material, in particular to a high-strength heat-resistant magnesium alloy material and a preparation process thereof, and belongs to the technical field of metal materials and metallurgy. Background technique [0002] Magnesium alloy is the lightest structural metal material currently used. It has high specific strength and specific stiffness, excellent casting performance and machining performance, and has shown broad application prospects in the fields of automobiles, electronics, aerospace and other fields. Due to its With low density, magnesium alloy has become an important material to replace aluminum alloy, steel, etc., and its use is particularly significant for weight reduction and energy saving. Although magnesium alloys have excellent room temperature performance, their poor heat resistance limits the application of magnesium alloys in automotive parts with high service temperature requirements, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
Inventor 赵德刚刘运腾田长文唐守秋姜利坤
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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