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

A high-toughness, high-strength technology, applied in the field of metal materials, can solve the problems of low mechanical properties at room temperature, low strength and plastic toughness, and the inability of strength and plastic toughness to meet the material requirements of thin-walled products, and achieve the effect of excellent casting performance

Inactive Publication Date: 2015-07-01
苏州昊卓新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the die-casting magnesium alloys used are mainly Mg-Al series, among which the most widely used AZ series alloys, such as AZ91 alloy, the mechanical properties of the alloy at room temperature are tensile strength of 230MPa, yield strength of 140MPa, and elongation of 3%. The alloy has balanced comprehensive properties, low mechanical properties, strength and plastic toughness at room temperature. This alloy has relatively good casting properties, so it is widely used in 3C products. The comprehensive properties, especially the strength and ductility can no longer meet the material requirements of thin-walled products

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0040] The ordinary Mg-Al series die-casting magnesium alloy (commercially available AZ91D alloy) was preheated at a temperature of 150°C~200°C for more than 60 minutes, and then placed in a protective gas SF 6 and N 2 Heat it in a melting furnace until it is completely melted, and raise the temperature of the melt to 720°C. After the AZ91D is completely melted, stir for 2 minutes until the mixture is uniform, remove the scum on the surface, let it stand for 15 minutes, cool down to below 660°C, and perform die-casting to obtain Alloy composition such as figure 1 .

[0041] The mechanical properties of the resulting alloy at room temperature are as follows:

[0042] Tensile strength UTS: 232 MPa

[0043] Yield strength YS: 135 MPa

[0044] Elongation δ: 2.3%

Embodiment 2

[0046] First, preheat the Mg-LaCe alloy, Mg-Y alloy and Mg-Sr alloy at 150°C~200°C for more than 60 minutes; then place the AZ91D alloy in SF with protective gas 6 and N 2 Heat it in a melting furnace until it is completely melted, raise the temperature of the melt to 720°C, and add the preheated Mg-LaCe alloy, Mg-Y alloy and Mg-Sr alloy. After fully melting, stir for 3-5min until the mixture is uniform. , remove the scum on the surface, let it cool down to below 660°C, and perform die-casting to obtain the high-strength and high-toughness die-casting magnesium alloy, such as figure 2 shown.

[0047] The mechanical properties of the resulting magnesium alloy at room temperature are as follows:

[0048] Tensile strength UTS=252 MPa

[0049] Yield strength YS= 160 MPa

[0050] Elongation δ= 3.0%

Embodiment 3

[0052] Preheat pure magnesium, pure aluminum, Mg-LaCe alloy, Mg-Y alloy, Mg-Gd alloy, and Mg-Sr alloy at 150°C~200°C for more than 60 minutes; then put pure magnesium and pure aluminum into the melting furnace, with protective gas SF 6 and N 2 Melt in a melting furnace. After all of them are melted, the melt temperature is raised to 720°C, and then the preheated Mg-LaCe alloy, Mg-Y alloy, Mg-Gd alloy and Mg-Sr alloy are added to the melt, fully After melting, stir for 3-5 minutes until the mixture is uniform, remove the scum on the surface, let it stand and cool down to below 660°C, and perform die-casting to obtain the high-strength and high-toughness die-casting magnesium alloy composition such as image 3 shown.

[0053] The mechanical properties of the resulting magnesium alloy at room temperature are as follows:

[0054] Tensile strength UTS=260MPa

[0055] Yield strength YS= 170MPa

[0056] Elongation δ= 4.3%

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Abstract

The invention discloses a high-strength high-toughness die-cast magnesium alloy which comprises the following ingredients, by weight, 8.8-9.4% of Al, 0.5-0.8% of Zn, 0.5-0.9% of Mn, 0.8-1.2% of La, 0.3-0.6% of Ce, 0.05-0.3% of Y, 0.05-0.3% of Sr, 0.5-1.5% of Gd and the balance Mg and unavoidable impurities. The die-cast magnesium alloy has high strength and high toughness. Meanwhile, the die-cast magnesium alloy has excellent castability and is suitable for thin-wall impact resistant products.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a high-strength, high-toughness die-casting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application. It has the advantages of low density, high specific strength, excellent machining performance and good shock absorption. It is widely used in aerospace, automobile and 3C fields. At present, the die-casting magnesium alloys used are mainly Mg-Al series, among which the most widely used AZ series alloys, such as AZ91 alloy, the mechanical properties of the alloy at room temperature are tensile strength of 230MPa, yield strength of 140MPa, and elongation of 3%. The comprehensive properties of this alloy are balanced, and the mechanical properties, strength and plastic toughness at room temperature are not high. This alloy has relatively good casting properties, so it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03
Inventor 单巍巍刘金平
Owner 苏州昊卓新材料有限公司
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