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High temperature creep resistant die-casting magnesium alloy and die-casting method thereof

A technology of high temperature resistance and magnesium alloy, which is applied in the field of magnesium alloy die-casting, can solve the problems of restricting the application of magnesium alloy parts, poor heat resistance of magnesium alloy, and decrease in strength of magnesium alloy, so as to achieve improved strength, good heat resistance, and Effect of Thermal Properties on Resistance to High Temperature Creep

Active Publication Date: 2019-04-23
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat resistance of these magnesium alloys is poor. When the temperature reaches 150°C, the strength of the magnesium alloy will drop sharply. High temperature creep failure, which greatly limits the application of magnesium alloy parts in high temperature environment
[0004] Therefore, the existing magnesium alloys for die casting and their die casting methods still need to be improved and developed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The high-temperature creep-resistant die-cast magnesium alloy is composed of the following mass percentages: Al 8.5%, Zn 0.9%, Zr 0.1%, B 0.05, Cr 0.05%, Yb 0.01%, Se 0.05%, Fe ≤ 0.05%, and the rest The amount is Mg and other unavoidable impurities, the individual content of other impurities is less than 0.01%, and the total amount is less than 0.05%. Its die-casting method comprises the following steps:

[0033] The first step: according to the composition and mass percentage of the magnesium alloy, select Mg10Zr5B alloy, Mg5Cr1Yb alloy, Mg5Se alloy, magnesium ingot with a purity of 99.9%, aluminum ingot with a purity of 99.7%, and zinc ingot with a purity of 99.85% as raw materials for batching;

[0034] Step 2: 0.5% SF by volume 6 +99.5%CO 2 Under the protection of the mixed gas, the magnesium ingot is heated and melted at 680°C, and then 8.5% of the total weight of the raw materials is added to the aluminum ingot, 0.9% of the zinc ingot, 1% of the Mg10Zr5B alloy, ...

Embodiment 2

[0038] The high-temperature creep-resistant die-cast magnesium alloy is composed of the following mass percentages: Al 9.5%, Zn 0.6%, Zr0.3%, B 0.15%, Cr 0.1%, Yb 0.02%, Se 0.15%, Fe ≤0.05%, The balance is Mg and other unavoidable impurities, the individual content of other impurities is less than 0.01%, and the total amount is less than 0.05%. Its die-casting method comprises the following steps:

[0039] The first step: according to the composition and mass percentage of the magnesium alloy, select Mg10Zr5B alloy, Mg5Cr1Yb alloy, Mg5Se alloy, magnesium ingot with a purity of 99.9%, aluminum ingot with a purity of 99.7%, and zinc ingot with a purity of 99.85% as raw materials for batching;

[0040] Step 2: 0.5% SF by volume 6 +99.5%CO 2 Under the protection of a mixed gas, the magnesium ingot is heated and melted at 720 ° C, and then 9.5% of the total weight of the raw material is added to the aluminum ingot, 0.6% of the zinc ingot, 3% of the Mg10Zr5B alloy, 2% of the Mg5Cr...

Embodiment 3

[0044] The high-temperature creep-resistant die-casting magnesium alloy is composed of the following mass percentages: Al 9%, Zn 0.8%, Zr0.2%, B 0.1%, Cr 0.075%, Yb 0.015%, Se 0.1%, Fe ≤0.05%, The balance is Mg and other unavoidable impurities, the individual content of other impurities is less than 0.01%, and the total amount is less than 0.05%. Its die-casting method comprises the following steps:

[0045] The first step: according to the composition and mass percentage of the magnesium alloy, select Mg10Zr5B alloy, Mg5Cr1Yb alloy, Mg5Se alloy, magnesium ingot with a purity of 99.9%, aluminum ingot with a purity of 99.7%, and zinc ingot with a purity of 99.85% as raw materials for batching;

[0046] Step 2: 0.5% SF by volume 6 +99.5%CO 2 Under the protection of mixed gas, the magnesium ingot is heated and melted at 700 °C, and then 9% of the total weight of the raw materials is added to the aluminum ingot, 0.8% of the zinc ingot, 2% of the Mg10Zr5B alloy, 1.5% of the Mg5Cr...

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Abstract

The invention relates to a high-temperature-creep-resistant die casting magnesium alloy and a die casting method thereof. The magnesium alloy is prepared from the components in percentage by mass: 8.5to 9.5 percent of Al, 0.6 to 0.9 percent of Zn, 0.1 to 0.3 percent of Zr, 0.05 to 0.15 percent of B, 0.05 to 0.1 percent of Cr, 0.01 to 0.02 percent of Yb, 0.05 to 0.15 percent of Se, less than or equal to 0.05 percent of Fe, and the balance Mg and other inevitable impurities. The die casting method comprises the steps of compounding, melting a magnesium alloy liquid, die casting for forming, andcarrying out solid solution aging treatment. According to the high-temperature-creep-resistant die casting magnesium alloy and the die casting method thereof provided by the invention, on the basis of optimizing main alloy elements such as the Al and the Zn, through multi-element alloying treatment, alpha-Mg crystal particles are refined, and an Fe-rich phase and an Mg17Al12 and MgZn2 phase are metamorphized, so that the strength, the heat resistance and the high temperature creep resistance of the die casting magnesium alloy are improved, and the die casting method is suitable for die casting magnesium alloy parts of automobiles, motorcycles, electric products and the like.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy die-casting, and in particular relates to a high-temperature creep-resistant die-casting magnesium alloy and a die-casting method thereof. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in industrial applications. It has the advantages of low density, high specific strength and specific stiffness, good damping and shock absorption, and good electromagnetic shielding effect. It is widely used in electronic information, sports equipment, hardware tools, and medical treatment. Equipment, transportation, aerospace and other fields have broad application potential, such as shells of various electronic appliances and electric tools, cylinder blocks and cylinder heads of automobile engines, car side doors, instrument panels, seat frames, etc. [0003] Die-casting technology can form various parts with complex structures, and has the advantages of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06B22D17/00
CPCB22D17/00C22C1/03C22C23/02C22F1/06
Inventor 王顺成黄正华康跃华甘春雷
Owner GUANGDONG INST OF NEW MATERIALS
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