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Casting magnesium alloy with high strength and toughness and preparation method thereof

A casting magnesium alloy, high-strength and high-toughness technology, applied in the field of metal material magnesium alloy, can solve the problems of high cost, unsuitable preparation of high-performance structural parts, difficulty in adding Zr elements, etc., to achieve increased strength, excellent aging strengthening ability, enhanced Effect of Age Hardening Ability

Active Publication Date: 2013-03-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, the alloy contains Zr element, Zr element is difficult to add, and the cost is relatively high
In addition, the room temperature elongation of ZK61 magnesium alloy is only 4-7%, which is not suitable for the preparation of high-performance structural parts

Method used

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  • Casting magnesium alloy with high strength and toughness and preparation method thereof
  • Casting magnesium alloy with high strength and toughness and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In this embodiment, the components and weight percentages of the high-strength and high-toughness cast magnesium alloy are: 8.0% Zn, 0.5% Al, 0.5% Cu, 0.5% Mn, and the rest are Mg and unavoidable impurity elements, and the impurity element content is < 0.01%.

[0027] The preparation method is as follows:

[0028] (1) Ingredients: The raw materials are metal Mg, metal Zn, metal Al, metal Cu and Mg-10wt.%Mn master alloy. The components of the alloy and their weight percentages are: 8.0%Zn, 0.5%Al, 0.5%Cu, 0.5%Mn, the rest is Mg;

[0029] (2) Melting: Use an iron crucible to melt in a resistance furnace, control the melting temperature to 740°C, and use CO 2 and SF 6 Mixed as shielding gas (by volume percentage, 99% CO 2 +1%SF 6 ), the raw material is preheated at 200°C, firstly add metal Mg, after metal Mg is completely melted, add metal Cu, smelt for 15 minutes, then add Mg-Mn intermediate alloy, smelt for 15 minutes, finally add metal Zn and Al, smelt for 10 minut...

Embodiment 2

[0034] In this embodiment, the components and weight percentages of the high-strength and high-toughness cast magnesium alloy are: 8.0% Zn, 1.0% Al, 0.5% Cu, 0.5% Mn, and the rest are Mg and unavoidable impurity elements, and the impurity element content is < 0.01%.

[0035] The preparation method is as follows:

[0036] (1) Ingredients: The raw materials are metal Mg, metal Zn, metal Al, metal Cu and Mg-10wt.%Mn master alloy. The components of the alloy and their weight percentages are: 8.0%Zn, 1.0%Al, 0.5%Cu, 0.5%Mn, the rest is Mg;

[0037] (2) Melting: Use an iron crucible to melt in a resistance furnace, control the melting temperature to 740°C, and use CO 2 and SF 6 Mixed as shielding gas (by volume percentage, 99% CO 2 +1%SF 6 ), the raw material is preheated at 200°C, firstly add metal Mg, after metal Mg is completely melted, add metal Cu, smelt for 15 minutes, then add Mg-Mn intermediate alloy, smelt for 15 minutes, finally add metal Zn and Al, smelt for 10 minut...

Embodiment 3

[0044] In this embodiment, the components and weight percentages of the high-strength and high-toughness cast magnesium alloy are: 8.0% Zn, 0.5% Al, 1.0% Cu, 0.5% Mn, the rest are Mg and unavoidable impurity elements, and the impurity element content is < 0.01%.

[0045] The preparation method is as follows:

[0046] (1) Ingredients: The raw materials are metal Mg, metal Zn, metal Al, metal Cu and Mg-10wt.%Mn master alloy. The components of the alloy and their weight percentages are: 8.0%Zn, 0.5%Al, 1.0%Cu, 0.5%Mn, the rest is Mg;

[0047] (2) Melting: Use an iron crucible to melt in a resistance furnace, control the melting temperature to 750°C, and use CO 2 and SF 6 Mixed as shielding gas (by volume percentage, 99% CO 2 +1%SF 6 ), the raw material is preheated at 200°C, firstly add metal Mg, after metal Mg is completely melted, add metal Cu, smelt for 15 minutes, then add Mg-Mn intermediate alloy, smelt for 15 minutes, finally add metal Zn and Al, smelt for 10 minutes ...

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Abstract

The invention relates to the field of magnesium alloy of metal materials, and concretely relates to a casting magnesium alloy containing Zn, Al, Cu and Mn with high strength and toughness. The casting magnesium alloy comprises the following components in percentage by weight: 6.0-8.0% of Zn, 0.5-1.5% of Al, 0.5-1.0% of Cu, 0.3-0.7% of Mn and the balance of Mg and inevitable impurity elements, wherein the content of the impurity elements is less than 0.01%. A preparation method of the casting magnesium alloy comprises the steps of: smelting Mg at the temperature of 740-760 DEG C by using an iron crucible; after pure magnesium is completely smelted, sequentially adding preheated pure metal Zn, Al, Cu and Mg-10wt.% and Mg intermediate alloy for alloying, wherein mixed CO2 and SF6 are used as protective gases in the pure magnesium smelting and alloying processes; stirring, slagging off, standing for 15-20 minutes, adjusting the temperature of an alloy fusant to 700-720 DEG C, and casting into an ingot; and carrying out solution treatment on the alloy for 24-64 hours at 350-400 DEG C, quenching by warm water at 40-60 DEG C, then preageing for 8-24 hours at 50-70 DEG C, and finally preageing for 2-6 hours at 150-200 DEG C to obtain the casting magnesium alloy with high strength and toughness. In room temperature extension tests of the casting magnesium alloy, the yield strength is not less than 205MPa, the tensile strength is not less than 305MPa, the elongation rate is not less than 10%, and the casting magnesium alloy has excellent comprehensive mechanical property.

Description

technical field [0001] The invention relates to the field of metal material magnesium alloys, in particular to a high-strength and high-toughness casting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal structural material, which has many advantages, such as high specific strength and specific stiffness, good casting performance, good electrical and thermal conductivity and electromagnetic shielding, excellent cutting performance, and easy to recycle and reuse. These characteristics make magnesium Alloys are used in a wide range of applications in electronics, automotive, and aerospace. [0003] At present, in the application of existing magnesium alloys, the share of cast magnesium alloys reaches 90%, mainly used in the automobile industry. The most widely used commercial cast magnesium alloys include AZ91D, AM60B, AS41 and AE42, etc. These magnesium alloys are used to prepare general parts such as gearbo...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/02
Inventor 杨院生王晶董旭光刘瑞东罗天骄
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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