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High-performance heat-resistant cast magnesium alloy and preparation method thereof

A technology for casting magnesium alloys with high performance, applied in the field of magnesium alloy materials, can solve the problem of high cost, and achieve the effects of improving the plasticity of the alloy, improving the performance of the heat treatment process, and improving the performance at room temperature and high temperature

Active Publication Date: 2017-03-01
HANDAN LIANCHENG MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some high-performance heat-resistant magnesium alloys currently exist, most of which use heavy rare earths or rare metals as the main alloying elements, which are expensive and can only be used in military or aerospace fields

Method used

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  • High-performance heat-resistant cast magnesium alloy and preparation method thereof
  • High-performance heat-resistant cast magnesium alloy and preparation method thereof
  • High-performance heat-resistant cast magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] High-performance heat-resistant cast magnesium alloy, the chemical composition is: Zn 5%, Si 1.5%, Sn 3%, Sr 0.5%, Bi 0.5%, and the rest is Mg.

[0028] The preparation method is as follows:

[0029] (1) Ingredients: The raw materials are metal Mg, Sn, Zn, Sr, Bi and 20% Mg-Si master alloy with a purity greater than 99.95%, Zn 5%, Si 1.5%, Sn 3%, Sr 0.5%, Bi 0.5%, the rest is the proportion of Mg ingredients;

[0030] (2) Melting: Iron crucible is used for smelting in a crucible resistance furnace. Metal Mg is smelted first. After metal Mg is completely melted, metal Sn, Zn, Sr, Bi and Mg-Si intermediate alloy are added, and Ca is pressed in a porous bell jar. enter. The smelting temperature is controlled at 750°C, using N 2 and SF 6 Mixed gas for protection, by volume percentage, N 2 95%, SF 6 5%, to obtain molten metal;

[0031] (3) Casting: the pouring temperature is 730° C., the metal mold preheating temperature is 200° C., and a cylindrical ingot of Φ13 mm×1...

Embodiment 2

[0035] High-performance heat-resistant cast magnesium alloy, the chemical composition is: Zn 6%, Si 1.5%, Sn 3%, Sr 0.5%, Bi 0.5%, and the rest is Mg.

[0036] The preparation method is as follows:

[0037] (1) Ingredients: The raw materials are metal Mg, Sn, Zn, Sr, Bi and 20% Mg-Si master alloy with a purity greater than 99.95%, Zn 6%, Si 1.5%, Sn 3%, Sr 0.5%, Bi 0.5%, the rest is the proportion of Mg ingredients;

[0038] (2) Melting: Iron crucible is used for smelting in a crucible resistance furnace. Metal Mg is smelted first. After metal Mg is completely melted, metal Sn, Zn, Sr, Bi and Mg-Si intermediate alloy are added, and Ca is pressed in a porous bell jar. enter. The smelting temperature is controlled at 750°C, using N 2 and SF 6 Mixed gas for protection, by volume percentage, N 2 95%, SF 6 5%, to obtain molten metal;

[0039] (3) Casting: the pouring temperature is 730° C., the metal mold preheating temperature is 200° C., and a cylindrical ingot of Φ13 mm×1...

Embodiment 3

[0043] High-performance heat-resistant cast magnesium alloy, the chemical composition by mass percentage is: Zn 7%, Si 1.5%, Sn 3%, Sr 0.5%, Bi 0.5%, and the rest is Mg.

[0044] The preparation method is as follows:

[0045](1) Ingredients: The raw materials are metal Mg, Sn, Zn, Sr, Bi and 20% Mg-Si master alloy with a purity greater than 99.95%, Zn 7%, Si 1.5%, Sn 3%, Sr 0.5%, Bi 0.5%, the rest is the proportion of Mg ingredients;

[0046] (2) Melting: Iron crucible is used for smelting in a crucible resistance furnace. Metal Mg is smelted first. After metal Mg is completely melted, metal Sn, Zn, Sr, Bi and Mg-Si intermediate alloy are added, and Ca is pressed in a porous bell jar. enter. The smelting temperature is controlled at 750°C, using N 2 and SF 6 Mixed gas for protection, by volume percentage, N 2 95%, SF 6 5%, to obtain molten metal;

[0047] (3) Casting: the pouring temperature is 730° C., the metal mold preheating temperature is 200° C., and a cylindrical...

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Abstract

The invention relates to a high-performance heat-resistant cast magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 5-8% of Zn, 1.5% of Si, 3% of Sn, 0.5% of Sr, 0.5% of Bi and the balance of Mg. The method comprises the following steps: preparing raw materials according to the mass percent; smelting Mg with an iron crucible in a crucible resistance furnace until the Mg is molten, adding Zn, Si, Sn, Sr and Bi, smelting at 720-750 DEG C by using an N2-SF6 gas mixture as a protective gas, and casting the obtained liquid metal at 730 DEG C; and carrying out solid solution on the obtained cast ingot at 350 DEG C for 24 hours, heating to 450 DEG C, carrying out solid solution for 12 hours, and aging the cast ingot at 200 DEG C for 36-60 hours. The room-temperature tensile strength of the obtained high-performance heat-resistant cast magnesium alloy is greater than or equal to 320 MPa, and the percentage of elongation is greater than or equal to 6%. The tensile strength at 200 DEG C is greater than or equal to 220 MPa, and the percentage of elongation is greater than or equal to 9%. The high-performance heat-resistant cast magnesium alloy has favorable comprehensive mechanical properties, and can be widely used in commercial parts, including automobile parts, electronic product components and components for aviation and aerospace.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy materials, and in particular relates to a high-performance heat-resistant cast magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, good damping and shock absorption, good electromagnetic shielding effect, excellent machining performance, stable part size, high specific strength and specific stiffness, and easy recycling. With the continuous advancement of science and technology, energy saving With the improvement of consumption reduction requirements and the increasing emphasis on environmental protection, especially since the implementation of the home appliance recycling law in 2001, magnesium alloys with excellent recycling characteristics are being increasingly widely used in the fields of automobile industry, electronics industry and aerospace industry. In recent years, the annual growth rate of magnesium a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
CPCC22C1/03C22C23/04C22F1/06
Inventor 尤俊华邱克强任英磊石强曲迎东李荣德
Owner HANDAN LIANCHENG MACHINERY MFG CO LTD
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