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Method for manufacturing high-performance complex aluminum alloy part

A high-performance technology for aluminum alloy parts, applied in the field of preparation of high-performance complex aluminum alloy parts, can solve problems such as limiting the application of load-bearing structural parts, uneven structure, density and hardness, and difference in mechanical properties

Inactive Publication Date: 2014-03-19
LAIWU VOCATIONAL & TECHNICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the preparation of complex aluminum alloy parts, casting and die-casting are mainly used at present. The obtained structure is coarse dendrite, and the structure, density and hardness of the material are very uneven. Although the parts are heat treated later, the mechanical properties and Compared with forgings, there is still a lot of difference, which limits its application as the main load-bearing structural parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] A method for preparing high-performance aluminum alloy parts is characterized in comprising the following steps:

[0021] A method for preparing high-performance aluminum alloy parts is characterized in comprising the following steps:

[0022] Step 1, the alloy ingot is melted at about 8000°C, and when the alloy ingot is completely transformed from a solid phase to a liquid phase, ultrafine rare earth elements are added, and the ultrafine rare earth elements include Nd, La and Pr, and the Nd, La The mass ratio to Pr is about 4:2:1, the mass of the ultrafine rare earth element is about 2% of the mass of the alloy ingot, and the heat preservation is for 3 minutes, and the alloy ingot is an aluminum alloy ingot;

[0023] Step 2: Add refining agent in an amount of 2 to 3 grams per kilogram of aluminum liquid, stir evenly, refine for 2 to 3 minutes, and use a spoon to scoop out the scum on the surface of the liquid metal. The refining agent is 44% sodium chloride+54% potass...

Embodiment 1

[0033] 1. Preparation of high-performance and complex parts of 6061 aluminum alloy

[0034] 1. Put the 6061 aluminum alloy ingot into the crucible, put the crucible containing the aluminum alloy ingot into a holding furnace with protective gas, and melt it at about 8000 ° C. When the aluminum alloy ingot is completely melted, add Nd, La Superfine rare earth with a mass ratio of about 4:2:1 to Pr, stir evenly, and keep warm for 3 minutes;

[0035] 2. Add 2 to 3 grams of refining agent per kilogram of aluminum liquid to the 6061 aluminum liquid obtained in step 1. The refining agent composition is 44% sodium chloride + 54% potassium chloride + 2% calcium fluoride, and stir evenly. Keep warm for 2 to 3 minutes, and use a spoon to scoop out the scum on the surface of the liquid metal;

[0036] 3. Pour the 6061 aluminum liquid obtained in step 2 into the rapid solidification atomization device, keep it warm at about 8000 ° C for 2 minutes, inject high-pressure nitrogen gas injecti...

Embodiment 2

[0040] Example 2: Preparation of high-performance and complex parts of 7090 aluminum alloy

[0041] The preparation steps are the same as those of 6061 aluminum alloy parts, except that the semi-solid isothermal treatment temperature is changed to 625° C. in step five.

[0042] Properties of 6061 aluminum alloy and 7090 aluminum alloy parts

[0043] Alloy (longitudinal sampling)

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PUM

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Abstract

The invention relates to a method for manufacturing a high-performance complex aluminum alloy part. The powder-forming idea is adopted by the method so that a mini-type part can be manufactured and a large-size part can also be formed. The mechanical property of the part is far higher than that of a powder metallurgy sintering piece; the shortage that the large-size part cannot be manufactured through an SIMA method is overcome; accurate forge touching forming of the parts can be achieved.

Description

technical field [0001] The patent of the present invention relates to a preparation method of high-performance complex aluminum alloy parts. Background technique [0002] For the preparation of complex aluminum alloy parts, casting and die-casting are mainly used at present. The obtained structure is coarse dendrite, and the structure, density and hardness of the material are very uneven. Although the parts are heat treated later, the mechanical properties and Compared with forgings, there is still a lot of difference, which limits its application as the main load-bearing structural parts. Semi-solid metal processing is a newly developed technology for one-time near-net-shape parts with complex shapes, and the mechanical properties of the parts are close to those of forgings. Both modification treatment and rapid solidification can improve the microstructure and performance of the alloy. This technology adopts the combination of modification treatment and rapid solidificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F3/24C22C1/02C22C1/04C22C1/06C22C21/00
Inventor 纪兴华陈文孙召瑞
Owner LAIWU VOCATIONAL & TECHNICAL COLLEGE