Rare earth aluminum alloy and preparation method thereof

A technology for aluminum alloys and aluminum alloy profiles, applied in the field of alloys, can solve the problems of poor profile processing performance and reduced alloy corrosion resistance.

Active Publication Date: 2013-04-03
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A small amount of Fe and Zn in the alloy has little effect on the strength of the aluminum alloy, but Fe will reduce the corrosion resistance of the alloy
The mechanical properties of the existing 6082 aluminum alloy profiles at room temperature are tensile strength ≥ 310MPa, elongation ≥ 10%, but their processing performance as profiles is poor

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0046] The present invention also provides a preparation method of a rare earth aluminum alloy profile, comprising the following steps:

[0047] Casting rare earth aluminum alloy ingots with the following composition: 0.7~1.3wt% Si, 0.4~1.0wt% Mn, 0.6~1.2wt% Mg, 0.1~0.2wt% RE, less than or equal to 0.5wt% Fe, C less than or equal to 0.25wt%, Zn less than or equal to 0.2wt%, Ti less than or equal to 0.1wt%, Cu less than or equal to 0.1wt%, and aluminum in the balance;

[0048] Homogenizing the rare earth aluminum alloy ingot;

[0049]The homogenized rare earth aluminum alloy ingot is extruded to obtain the rare earth aluminum alloy profile.

[0050] According to the present invention, first prepare materials according to the composition and content of the rare earth aluminum alloy, and cast the rare earth aluminum alloy ingot. Since the melting point and density of the rare earth and Al are quite different, in order to prevent the rare earth from precipitation at the bottom of...

Embodiment 1

[0057] Step 1: Prepare materials according to the composition of the rare earth aluminum alloy, based on one ton of 6082 aluminum alloy, including 7kg of Si, 4.5kg of Fe, 10kg of Mn, 2.1kg of Cr, 10kg of Mg, 1.5kg of Zn, 0.8kg Ti, 0.8kg Cu.

[0058] Step 2: First add aluminum ingots to the furnace, heat to melt them completely, add the materials prepared in Step 1 according to the formula ratio, and melt them completely, refine at 750°C for 1 hour, and keep it at 700°C after refining to obtain alloy melt.

[0059] Step 3: Use nitrogen to degas and pickle the alloy melt for the first time, and continue to ventilate until the reaction is complete, then add the rare earth aluminum master alloy containing 2kg of rare earth into the furnace until it is completely melted, and then perform the second degassing and pickling process , and finally let it stand for 30 minutes, and take it out of the oven.

[0060] Step 4: Air-cool the ingot obtained in Step 3, and then homogenize it at...

Embodiment 2

[0064] Step 1: Prepare materials according to the composition of rare earth aluminum alloys. One ton of 6082 aluminum alloys includes 10kg of Si, 4.5kg of Fe, 8kg of Mn, 2kg of Cr, 12kg of Mg, 1.5kg of Zn, and 0.8kg of Ti, 0.8 kg of Cu.

[0065] Step 2: Add aluminum ingots into the furnace first, heat to melt them completely, add the materials prepared in Step 1 according to the formula ratio, and melt them completely, refine at 750°C for 1 hour, and keep it at 800°C after refining to obtain alloy melt.

[0066] Step 3: Use nitrogen to degas the alloy melt for the first time, and continue to ventilate until the reaction is complete, then add the rare earth aluminum master alloy containing 1.5kg of rare earth to the furnace until it is completely melted, and then perform the second degassing and degassing In the process, let it stand for 30 minutes at the end, and take it out of the oven.

[0067] Step 4: Air-cool the ingot obtained in Step 3, and then homogenize it at 550±5°...

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Abstract

The invention provides a rare earth aluminum alloy and a preparation method of the rare earth aluminum alloy. The rare earth aluminum alloy comprises the following compositions in percentage by weight: 0.7-1.3 wt percent of Si, 0.4-1.0 wt percent of Mn, 0.6-1.2 wt percent of Mg, 0.1-0.2 wt percent of Re, Fe larger than 0 wt percent and no more than 0.5 wt percent, Cr larger than 0 wt percent and no more than 0.25 wt percent, Zn larger than 0 wt percent and no more than 0.2 wt percent, Ti larger than 0 wt percent and no more than 0.1 wt percent, Cu larger than 0 wt percent and no more than 0.1 wt percent and the balance of aluminum. According to the rare earth aluminum alloy provided by the invention, because a small number of rare earth elements are added in an aluminum alloy and can have stronger affinity with gas and many nonmetals, and a compound with high melting point is produced, the rare earth aluminum alloy has the certain actions of dehydrogenation, refining and purification; and meanwhile, the rare earth elements can also be selectively adsorbed to an interface of a grown crystal grain to block the growth of the crystal grain and enable the crystal grain to be refined, thus strengthening the strength of the aluminum alloy and improving the processing performance of the aluminum alloy.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to a rare earth aluminum alloy and a preparation method thereof. Background technique [0002] With the rapid development of my country's national economy, the demand for aluminum alloy profiles with high performance and complex sections is increasing day by day in industries such as transportation and structural engineering. Most of these industrial profiles are 6000-series aluminum alloys that can be quenched online after extrusion. Among them, 6082 aluminum alloys are widely used. It is an aluminum alloy plate that can be strengthened by heat treatment. It has medium strength, good welding performance, and corrosion resistance. It is mainly used in transportation and structural engineering industries. [0003] 6082 aluminum alloy is an Al-Mg-Si alloy, its chemical composition includes: 0.7~1.3wt% Si; less than or equal to 0.5wt% Fe; less than or equal to 0.10wt% Cu; 0.4~1.0wt% Mn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22F1/043
Inventor 孟健牛晓东孙伟邱鑫田政张德平鲁化一唐定骧
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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