Method for modifying AlSi9Cu2 cast aluminum alloy by rare-earth Y

An alloy and rare earth technology, applied in the field of metamorphic cast aluminum-silicon alloys, can solve problems such as stomatal defects of AlSi9Cu2 alloys, and achieve the effects of easy composition control, improved as-cast performance, and large cooling rate.

Inactive Publication Date: 2017-04-26
镇江创智特种合金科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of porosity defects in the AlSi9Cu2 alloy obtained by using the modifier Sr

Method used

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  • Method for modifying AlSi9Cu2 cast aluminum alloy by rare-earth Y
  • Method for modifying AlSi9Cu2 cast aluminum alloy by rare-earth Y

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] The method for modifying AlSi9Cu2 alloy by rare earth Y in the present embodiment is realized through the following steps: 1. Weigh 51.5% to 57.5% of high-purity aluminum with a mass purity of 99.99%, and Al-20Si of 42.5% to 48.5% by weight percentage Master alloy, 1.5%~2.5% mass purity of 99.99% high-purity copper and 1.5%~2.5% Al-l0Y master alloy; 2. Clean and dry the high-purity aluminum and Al-20Si master alloy weighed in step 1 Then put it into a resistance furnace with a power of 10kW, heat it until it is completely melted, and control the temperature of the melt at 750°C~780°C; 3. Use a graphite bell jar with a temperature of 200°C to press the high-purity copper weighed in step 1 into the step 2. In the obtained melt, heat preservation and stand for 15-25min to obtain AlSi9Cu2 alloy melt, wherein the graphite bell jar is preheated at 200°C for 10-20min before use; 4. Add refining agent C to the AlSi9Cu2 alloy melt in step 3 2 Cl 6 After refining for 1 minute, a...

Embodiment approach 2

[0021] The method of the rare earth Y modified AlSi9Cu2 alloy of the present embodiment is realized through the following steps: 1. Weigh 52.5% of high-purity aluminum with a mass purity of 99.99%, 43.5% of Al-20Si master alloy, 2.0% of The mass purity is 99.99% high-purity copper and 2.0% Al-10Y master alloy; 2. After cleaning and drying the high-purity aluminum and Al-20Si master alloy taken in step 1, put it into a resistance furnace with a power of 10kW, and heat Until complete melting, the melt temperature is controlled at 780°C; 3. Use a graphite bell jar with a temperature of 200°C to press the high-purity copper weighed in step 1 into the melt obtained in step 2, and keep it for 20 minutes to obtain AlSi9Cu2 alloy Melt, wherein the graphite bell jar is preheated at 200 ° C for 15 minutes before use; 4. Add refining agent C to the AlSi9Cu2 alloy melt in step 3 2 Cl 6 After refining for 1 minute, add the Al-l0Y intermediate alloy weighed in step 1 to the AlSi9Cu2 alloy ...

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Abstract

The invention discloses a method for modifying an AlSi9Cu2 alloy by rare-earth Y, and relates to a method for modifying a cast aluminum-silicon alloy. By using the method for modifying the AlSi9Cu2 alloy by the rare-earth Y, the problem that a gas-hole defect exists in an AlSi9Cu2 cast alloy obtained by adopting a modifier Sr is solved. The method provided by the invention comprises the following steps of weighing to take high-purity aluminum, an Al-2OSi intermediate alloy, high-purity copper and an Al-10Y intermediate alloy raw material, fusing the high-purity aluminum and the Al-2OSi intermediate alloy, then pressing the high-purity copper into an obtained first mixture, smelting an obtained second mixture to obtain a fused mass, then adding the Al-10Y intermediate alloy into the fused mass, smelting an obtained third mixture, and pouring the smelted third mixture, so that the AlSi9Cu2 alloy is obtained subsequently. The method provided by the invention is simple, and is suitable for mass production. No gas holes exist in the obtained Y-modified AlSi9Cu2 alloy; the cast structure of the alloy is obviously thinned; the obdurability of the AlSi9Cu2 alloy is improved; and the compactability of a casting is increased.

Description

technical field [0001] The invention relates to a method for metamorphic casting of aluminum-silicon alloy. Background technique [0002] Al-Si alloy has good casting properties and mechanical properties, and is currently the most widely used cast aluminum alloy in industry. Al-Si alloy has low density, good casting performance, high mechanical properties, and can cast high-strength castings with complex shapes. It is widely used in automobile, aerospace and other industries. [0003] In Al-Si alloys, the addition of Cu can form CuAl 2 Strengthening phase, the strengthening method of AlSi9Cu2 alloy is age hardening, which can be explained by dislocation theory, that is, the diffusion and segregation of solute elements, thereby forming solute element enrichment areas, that is, wireless micro areas. With the extension of aging time, these The region and the matrix will generate a variety of different precipitated phases, thereby forming an alternating stress field, making di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03C22C1/06
CPCC22C21/00C22C1/026C22C1/03C22C1/06
Inventor 张松利印厚尚张炳荣张冬梅张倩
Owner 镇江创智特种合金科技发展有限公司
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