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Aluminum-silicon-magnesium casting alloy mechanical property improving method

A technology for casting alloys and magnesium alloys, which is applied in the field of improving the mechanical properties of aluminum-silicon-magnesium casting alloys, and can solve the problems of high raw material costs

Active Publication Date: 2020-02-28
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, the metamorphism of heavy rare earths is better than that of light rare earths, but the cost of raw materials is relatively high

Method used

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  • Aluminum-silicon-magnesium casting alloy mechanical property improving method
  • Aluminum-silicon-magnesium casting alloy mechanical property improving method
  • Aluminum-silicon-magnesium casting alloy mechanical property improving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A ZL101 aluminum alloy melt is selected, and the silicon content is 7.06wt%. The iron content is 0.09 wt%. Other elements meet the alloy composition requirements. When the melt temperature is 750°C, add aluminum-lanthanum master alloy (the content of lanthanum is 10-20wt%) and aluminum-erbium master alloy (the content of erbium is 10-20wt%), the addition of lanthanum and erbium is respectively molten 0.25wt% and 0.05wt% of body weight. The melt was stirred and refined with nitrogen for 15 minutes. When the melt temperature is 690 ° C, it is quickly injected into the metal cavity, and the thickness of the casting is 10 mm. The metal mold is cooled by air, and the casting is water-cooled after demoulding. The water-cooled casting is kept at 515°C for 6 hours, cooled in 80-100°C water, and then cooled at 180°C for 12 hours. The tensile strength of the obtained alloy is 316MPa, the elongation is 11.6%, and the hardness is 82HB; the scanning electron microscope shows f...

Embodiment 2

[0039] A ZL101 aluminum alloy melt is selected, and the silicon content is 7.12wt%. The iron content is 0.15 wt%. Other elements meet the alloy composition requirements. When the melt temperature is 760° C., cerium chloride and aluminum-holmium master alloy (the content of holmium is 10-20 wt %) are added, and the cerium chloride is baked for 24 hours before adding. The addition amounts of cerium and holmium are respectively 0.34wt% and 0.15wt% of the melt weight. The melt was stirred and refined with nitrogen for 10 minutes. When the melt temperature is 720 ° C, it is quickly injected into the metal cavity, and the thickness of the casting is 10 mm. The metal mold is cooled by air, and the casting is water-cooled after demoulding. The water-cooled casting is kept at 515°C for 8 hours, cooled in 80-100°C water, and then cooled at 180°C for 15 hours. The tensile strength of the obtained alloy is 280MPa, the elongation is 8.5%, and the hardness is 88HB; the scanning electro...

Embodiment 3

[0041] A ZL101 aluminum alloy melt is selected, and the silicon content is 7.10wt%. The iron content is 0.12 wt%. Other elements meet the alloy composition requirements. When the melt temperature was 740°C, a mixture of yttrium chloride and gadolinium fluoride was added, and the yttrium chloride and gadolinium fluoride were baked for 24 hours before addition. The addition amounts of yttrium and gadolinium are 0.30wt% and 0.15wt% of the melt weight, respectively. The melt was stirred and refined with nitrogen for 10 minutes. When the melt temperature is 700 ° C, it is quickly injected into the metal cavity, and the thickness of the casting is 10 mm. The metal mold is cooled by air, and the casting is water-cooled after demoulding. The water-cooled casting is kept at 515°C for 6 hours, cooled in 80-100°C water, and then cooled at 180°C for 10 hours. The tensile strength of the obtained alloy is 286MPa, the elongation is 8.6%, and the hardness is 85HB; the scanning electron ...

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Abstract

The invention discloses an aluminum-silicon-magnesium casting alloy mechanical property improving method. Light rare earth is adopted and cooperates with heavy rare earth to process alloy melt, and the iron content is 0.09-0.20 wt% of the alloy melt mass. According to the improving method, based on the difference, in the aspect of physicochemical property, between light rare earth elements and heavy rare earth elements as well as the influence on the alloy crystallization process, the method of utilizing the light rare earth and the heavy rare earth to be combined and modified to control the microstructure and mechanical property of alloy is provided, the light rare earth and the heavy rare earth give play to advantage separately, namely, the light rare earth is focused on enriching on thealpha-Al and Si crystal solidification front and being adsorbed on the surface of crystal, and achieves the effects of refining and modifying; and the heavy rare earth is focused on adsorbing or conducting solid solution on iron-rich Al-Fe and Al-Fe-Si group harmful compound, influencing the microstructure of the compound, impeding growth of crystal, and promoting the compound to be decomposed into short rod-like shape or granular shape at the high temperature; and the light rare earth and the heavy rare earth achieve mutual complementarity in the aspect of controlling the microstructure of the alloy, and substantially, the quite good modifying effect is achieved.

Description

technical field [0001] The invention relates to the technical field of alloy smelting. Specifically, it is a method for improving the mechanical properties of aluminum-silicon-magnesium casting alloys. Background technique [0002] ZL101 casting alloy has good fluidity and low thermal expansion coefficient, and is used to manufacture castings with complex shapes, such as automobile hubs, housings, boxes and mechanical brackets. In order to solve the problem of coarse eutectic silicon and coarse aluminum grains in industrial production, the modification method of adding aluminum-titanium-boron refiner and aluminum-strontium modifier to the melt is often used. This process can better improve the structure and improve the mechanical properties, but because the low-melting point strontium is prone to volatilization and oxidation during high-temperature smelting and pouring, resulting in pores, inclusions and even reduced metamorphic effects in the alloy, resulting in fluctuatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06B22D21/00C22F1/043
CPCB22D21/007C22C1/026C22C1/03C22C1/06C22F1/043
Inventor 史志铭张瑞英刘慧敏林亚明李宁宇廉浩王利明王存权
Owner INNER MONGOLIA UNIV OF TECH
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