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High-strength heat-proof compression casting magnesium alloy and preparation method thereof

A heat-resistant pressure and high-strength technology, applied in the field of metal materials, can solve the problems of poor die-casting performance, limited alloy application, complex melting process, etc., and achieve the effects of good die-casting performance, wide sources and simple processing.

Active Publication Date: 2007-09-19
WEIHAI WANFENG MAGNESIUM IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the AZ91 alloy is currently the most widely used die-casting magnesium alloy at room temperature. It has high room temperature strength and good casting performance, but due to its main strengthening phase Mg 17 Al 12 The thermal stability of the alloy is poor so that the long-term use temperature cannot exceed 120°C, thus limiting the application of the alloy
Among the existing heat-resistant magnesium alloys, AS series (such as AS21, AS41) and AE series (such as AE42) alloys have high high-temperature strength, but their die-casting performance is poor, and they are not suitable for die-casting, which is the most widely used magnesium alloy. molding process
In addition, Mg-Zn-Zr series and Mg-RE-Zr series alloys contain more precious metals Zr and RE, making their prices higher, and the melting process is more complicated, so their applications are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0009] The AZ91 ingot is preheated to 150℃ in a preheating furnace, and placed in a preheating furnace with 0.03% SF 6 And the margin is N 2 The mixed gas is protected in a melting furnace and heated to 700°C. After the alloy is completely melted, preheat Ca (pre-wrapped with aluminum foil) and Y to 200°C, directly add them to the melt and stir slightly with a stirring tool to make it evenly mixed, continue to heat up to 750°C, and let stand for 30 minutes. Then the temperature is lowered to 680°C, the surface scum is removed, and die casting is performed.

[0010] Mg

[0011] The alloy is die-casted into tensile specimens, and the measured tensile properties at room temperature are: σ b =255.3MPa,σ s = 179.3MPa, δ 5 =4.0%; the tensile property at 200℃ is σ b = 229.5MPa, σ s = 131.3MPa, δ 5 = 9.0%.

example 2

[0013] The AZ91 ingot is preheated to 150℃ in a preheating furnace, and placed in a preheating furnace with 0.03% SF 6 And the margin is N 2 The mixed gas is protected in a melting furnace and heated to 700°C. After the alloy is completely melted, preheat Ca (pre-wrapped with aluminum foil) and Y to 200°C, directly add them to the melt and stir slightly with a stirring tool to make it evenly mixed, continue to heat up to 750°C, and let stand for 30 minutes. Then the temperature is lowered to 680°C, the surface scum is removed, and die casting is performed.

[0014] Mg

[0015] The alloy is die-casted into tensile specimens, and the measured tensile properties at room temperature are: σ b =241.5MPa,σ s =158.6MPa, δ 5 =3.0%; the tensile property at 200℃ is σ b =218.8MPa, σ s =117.1MPa, δ 5 = 7.8%.

example 3

[0017] The AZ91 ingot is preheated to 150℃ in a preheating furnace, and placed in a preheating furnace with 0.03% SF 6 And the margin is N 2 The mixed gas is protected in a melting furnace and heated to 700°C. After the alloy is completely melted, preheat Ca (pre-wrapped with aluminum foil) and Y to 200°C, directly add them to the melt and stir slightly with a stirring tool to make it evenly mixed, continue to heat up to 750°C, and let stand for 30 minutes. Then the temperature is lowered to 680°C, the surface scum is removed, and die casting is performed.

[0018] Mg

[0019] The alloy is die-casted into tensile specimens, and the measured tensile properties at room temperature are: σ b =249.2MPa,σ s =176.9MPa, δ 5 =4.5%; the tensile property at 200℃ is σ b = 224.8MPa, σ s = 126.4MPa, δ 5 = 9.5%.

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Abstract

A compression casting magnesium alloy with high strength heat resisting and its producing method are disclosed. The invention provides a method of producing compression casting magnesium alloy with high performance by adding metal calcium Ca and lanthanon Y into AZ91 alloy in order to solve the problem that the existing AZ91 magnesium alloy has poor heat resisting. Its composition is, based on mass percent, 8.5-9.5% Al, 0.4-0.9%Zn, 0.1-0.4%Mn, 0.5-1.5%Ca, 0.5-1.5%Y, the impurity: Si <= 0.02, Fe <= 0.003, Ni <= 0.003, Cu <= 0.003, and the residuel of Mg. The alloy of the invention has the advantages of simple treatment for fused body, good compression casting processability, higher mechanical behavior under high temperature and low cost, and is prone to be widely used, in particular is suitable for commerical producing in large scale and has market potential. The obdurability parameters under room temperature and high temperature of the alloy is higher than commercial AZ91 alloy.

Description

Technical field [0001] The invention relates to a high-strength heat-resistant die-cast magnesium alloy and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical applications. It has the advantages of low density, high specific strength, excellent machining performance and good shock absorption. It is widely used in aerospace, automotive and 3C products. Among them, AZ91 alloy is currently the most commonly used die-casting magnesium alloy at room temperature. It has higher room temperature strength and good casting performance, but due to its main strengthening phase Mg 17 Al 12 The poor thermal stability of the alloy makes its long-term use temperature not exceed 120℃, which limits the application of the alloy. Among the existing heat-resistant magnesium alloys, although the AS series (such as AS21, AS41) and AE series (such as AE42) alloys have high...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03
Inventor 王峰林立刘正于宝义
Owner WEIHAI WANFENG MAGNESIUM IND DEV
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