Modification treatment method of aluminium alloy

A modification treatment, aluminum alloy technology, applied in the field of aluminum alloy, can solve the problems of inability to meet industrial applications, limited refining effect, high Sc price, etc., and achieve the effects of fine grains, small dendrite spacing, and low cost.

Active Publication Date: 2017-05-31
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the refinement effect of La, Ce, and Er is limited, and Sc is expensive, which cannot meet industrial applications.

Method used

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  • Modification treatment method of aluminium alloy
  • Modification treatment method of aluminium alloy
  • Modification treatment method of aluminium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put the A356 aluminum alloy (Al-7Si-0.6Mg) in a graphite crucible that has been cleaned and preheated to 500 °C, and placed in a SG2-7.5-12 resistance furnace to heat up to 750 °C to melt, and the A356 aluminum alloy ( After Al-7Si-0.6Mg) is completely melted, when the temperature is 720° C. to 750° C., the Al-12Er master alloy is pressed in with a bell jar, so that the Er content reaches 0.20%. Use a graphite rod to stir evenly for 1 minute, keep warm for 4-6 minutes, so that the elements are evenly distributed, and when the temperature of the melt drops to 700 ° C ~ 720 ° C, use a bell jar to press 0.10% of the mass of hexacyanoethane into the melt for degassing and degassing Let the slag stand for 10 minutes, remove the slag, filter, and pour it into a metal mold preheated to 220°C to make a metallographic sample and observe the metallographic structure.

[0027] In the solidification structure of the A356 alloy (Al-7Si-0.6Mg) with 0.20% Er content in Example 1, the ...

Embodiment 2

[0031] Put the A356 aluminum alloy (Al-7Si-0.6Mg) in a graphite crucible that has been cleaned and preheated to 500°C, and placed in a SG2-7.5-12 resistance furnace to heat up to 750°C to melt, and the A356 aluminum alloy ( After Al-7Si-0.6Mg) is completely melted, when the temperature is 720°C-750°C, use a bell jar to press into the Al-12Er master alloy, so that the Er content reaches 0.40%. Use a graphite rod to stir evenly for 1 minute, keep warm for 4-6 minutes, so that the elements are evenly distributed, and when the temperature of the melt drops to 700 ° C ~ 720 ° C, use a bell jar to press 0.10% of the mass of hexacyanoethane into the melt for degassing and degassing Let the slag stand for 10 minutes, remove the slag, filter, and pour it into a metal mold preheated to 220°C to make a metallographic sample and observe the metallographic structure. In the solidification structure of A356 alloy (Al-7Si-0.6Mg) without adding refiner, the primary aluminum dendrites are thic...

Embodiment 3

[0034] Put the A356 aluminum alloy (Al-7Si-0.6Mg) in a graphite crucible that has been cleaned and preheated to 500°C, and placed in a SG2-7.5-12 resistance furnace to heat up to 750°C to melt, and the A356 aluminum alloy ( After Al-7Si-0.6Mg) is completely melted, the Al-10Zr master alloy is pressed into the Al-10Zr master alloy with a bell jar at a temperature of 720° C. to 750° C., so that the Zr content reaches 0.10%. Use a graphite rod to stir evenly for 1 minute, keep warm for 4-6 minutes, so that the elements are evenly distributed, and when the temperature of the melt drops to 700 ° C ~ 720 ° C, use a bell jar to press 0.10% of the mass of hexacyanoethane into the melt for degassing and degassing Let the slag stand for 10 minutes, remove the slag, filter, and pour it into a metal mold preheated to 220°C to make a metallographic sample and observe the metallographic structure. In the solidification structure of A356 alloy (Al-7Si-0.6Mg) without adding refiner, the prima...

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Abstract

The invention belongs to the technical field of aluminium alloys, and relates to a modification treatment method of an aluminium alloy. The modification treatment method is characterized in that Al-10Zr and Al-12Er intermediate alloys are adopted as an alterant, an A356 aluminium alloy is adopted as a modification object; 0.20% of Zr and 0.40% of Er are added, and the microstructure and performance of the A356 aluminium alloy are remarkably improved through the technological processes like batching, smelting and modification treatment; and tensile strength of the A356 aluminium alloy subjected to modification treatment of the Al-10Zr intermediate alloy and the Al-12Er intermediate alloy is 225 MPa, elongation is 6.4%, and tensile strength and elongation are respectively improved by 52.8% and 36.2% compared with tensile strength and elongation of the A356 aluminium alloy which is not subjected to modification treatment.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and relates to a modification treatment method for aluminum alloys. Background technique [0002] Cast Al-Si alloy has excellent casting performance and mechanical properties. Due to its good casting fluidity, high strength and good machining characteristics, Al-Si alloy has a wide range of applications in the fields of aerospace, shipbuilding and automobiles. application. With the further development of automobiles, aviation and other fields, the existing Al-Si alloy castings will be difficult to meet their development requirements. In order to broaden the application range of Al-Si alloys, fine and uniformly distributed etc. Axial primary aluminum phase, thereby improving the performance of Al-Si alloy. [0003] Rare earth elements can be selectively adsorbed on the growing grain interface, hindering the growth of grains, resulting in grain refinement and deterioration. The study fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 卢雅琳李晓燕王健周东帅李兴成朱福先徐文婷
Owner JIANGSU UNIV OF TECH
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