A hypoeutectic al-mg 2 Modification and refinement method of si alloy

A hypoeutectic and alloy technology, applied in the field of aluminum alloy casting and smelting, can solve the problems of consumption of Sr and B, weakening of metamorphism and refinement effect casting defects, reduction of alloy tensile properties, etc., to reduce the degree of supercooling, Balance the effect of lower crystallization temperature and lower growth rate

Active Publication Date: 2019-10-08
青岛六点轴承科技有限公司
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AI Technical Summary

Problems solved by technology

Studies have shown that Al-3B, Al-3Ti-3B and other B-type refining agents have a good refining effect on hypoeutectic cast aluminum-silicon alloys with a silicon content > 4%, but B is easy to react with the metamorphic element Sr, Generate SrB 6 , consuming Sr and B
For Al-Mg 2 Si alloy, because it contains a higher amount of Mg, the refining elements are more likely to form non-nucleating compounds with Mg and metamorphic elements, which weakens the effect of metamorphism and refining or causes casting defects
Fakhraei et al. from the University of Tehran in Iran found that adding too much B or Zr to the Al-20Mg alloy will produce pores, resulting in a decrease in the tensile properties of the alloy. See Materials & Design, 2014, 56 (4): 557-564

Method used

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  • A hypoeutectic al-mg <sub>2</sub> Modification and refinement method of si alloy

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Experimental program
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Effect test

Embodiment 1

[0054] 1. Use Al-15Si master alloy, pure Al and pure Mg to prepare hypoeutectic Al-Mg 2 Si alloy, where Mg and Si are 10.wt %Mg 2 The ratio of Si is added, the amount of Mg added is: calculated amount + 10% of the burning loss, and the balance is pure Al;

[0055] 2. After cleaning and drying the pure Al and aluminum-silicon master alloy prepared in step 1, put them into the graphite crucible of the resistance furnace, heat the pure Al and Al-15Si master alloy in the resistance furnace, and heat them at 720°C after they are completely melted. ℃, press the pure Mg block wrapped in aluminum foil and preheated to 300℃ into the melt with a graphite bell jar preheated to 300℃, until it melts, and let it stand for 5min;

[0056] 3. Press 0.1% of the mass of hexachloroethane into the melt obtained in step 2 with a graphite bell jar preheated at 300°C, carry out refining and degassing, stir at 740°C for 3 minutes, and remove the surface of the melt The scum of the obtained refined m...

Embodiment 2

[0062] 1. Use Al-15Si master alloy, pure Al and pure Mg to prepare hypoeutectic Al-Mg 2 Si alloy, where Mg and Si are 4.wt %Mg 2 The proportion of Si is added, the amount of Mg added is: calculated amount + 20% of the burning loss, and the balance is pure Al;

[0063] 2. After cleaning and drying the pure Al and aluminum-silicon master alloy prepared in step 1, put them into the graphite crucible of the resistance furnace, heat the pure Al and Al-15Si master alloy in the resistance furnace, and heat them at 720°C after they are completely melted. ℃, press the pure Mg block wrapped in aluminum foil and preheated to 300℃ into the melt with a graphite bell jar preheated to 300℃, until it melts, and let it stand for 5min;

[0064] 3. Press hexachloroethane accounting for 0.05% of the mass of the melt into the melt obtained in step 2 with a graphite bell jar preheated at 300°C, carry out refining and degassing, stir at 780°C for 1 min, and remove the surface of the melt The scum ...

Embodiment 3

[0070] 1. Use Al-15Si master alloy, pure Al and pure Mg to prepare hypoeutectic Al-Mg 2 Si alloy, where Mg and Si are 12.5wt%Mg 2 The ratio of Si is added, the amount of Mg added is: calculated amount + 30% of the burning loss, and the balance is pure Al;

[0071] 2. After cleaning and drying the pure Al and aluminum-silicon master alloy prepared in step 1, put them into the graphite crucible of the resistance furnace, heat the pure Al and Al-15Si master alloy in the resistance furnace, and heat them at 720°C after they are completely melted. ℃, press the pure Mg block wrapped in aluminum foil and preheated to 300℃ into the melt with a graphite bell jar preheated to 300℃, until it melts, and let it stand for 5min;

[0072] 3. Press 0.2% of the mass of hexachloroethane into the melt obtained in step 2 with a graphite bell jar preheated at 300°C, carry out refining and degassing, stir at 670°C for 5 minutes, and remove the surface of the melt The scum of the obtained refined m...

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Abstract

The invention discloses a hypo eutectic Al-Mg2Si alloy modification and refining method. A hypo eutectic Al-Mg2Si alloy with the Mg2Si content being 4-12.5 wt.% is subjected to modification and refining treatment through Bi and Zr, and after treatment, the Bi content in melt is 0.1%-0.6%, and the Zr content is 0.05%-0.2%. The eutectic Mg2Si in the alloy obtained after Bi modification treatment isconverted into a fine fiber shape from the thick Chinese character shape, and the primary alpha-Al in the alloy obtained after Zr refining treatment is converted into the isometric crystal from the columnar crystal, the mechanical performance is greatly improved, and the tensile strength and the elongation of the alloy obtained after refining and modification are improved by 34% and 239% correspondingly. The structure can be obviously refined after modification and refining treatment is conducted on hypo eutectic Al-Mg2Si alloys different in Mg2Si content. Meanwhile, the Bi modification and Zrrefining effects are not influenced by the cooling speed and are suitable for the metal type and also suitable for the sand type. The Bi modificator and the Zr refining agent further have the beneficial effects that the excellent long residual action is achieved, the treatment technology is simple, and pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting and smelting, in particular to a hypoeutectic Al-Mg 2 Modification and refinement method of Si alloy. Background technique [0002] In traditional Al-Si-Mg alloys, Mg 2 As the second phase, Si is dispersed and precipitated through solid solution-aging heat treatment to strengthen the Al matrix. In recent years, direct precipitation of Mg from molten aluminum 2 Al-Mg formed from Si phase 2 Si alloys, which in hypereutectic composition are also known as in situ autogenous Mg 2 Si / Al composite materials have been widely concerned by scholars at home and abroad. Compared with the traditional Al-Si-Mg alloy, this material contains Mg content and Mg 2 The volume fraction of Si phase is higher, and it has higher specific stiffness, specific strength, wear resistance and other excellent properties. It has wider application prospects as a new lightweight material in the fields of aeros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/08C22C1/06
Inventor 武晓峰伍复发赵荣达张广安
Owner 青岛六点轴承科技有限公司
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