Method for manufacturing aluminum alloy through powder liquid phase die forging

A technology for powder preparation and aluminum alloy, applied in the field of powder metallurgy aluminum alloy preparation, can solve problems such as difficulty in achieving full densification, hindering powder metallurgy aluminum alloy sintering and densification, etc. Effect

Active Publication Date: 2014-04-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for aluminum alloy powder, because the surface is covered with a layer of dense aluminum oxide film (thickness is 5-15nm), this layer of dense film will seriously hinder the sintering and densification of powder metallurgy aluminum alloy. process, it is difficult to achieve full density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1（2024

[0022] Implementation example 1 (2024 aluminum alloy)

[0023] The composition of the 2024 aluminum alloy in this embodiment is 4.5Cu-1.4Mg-0.5Mn-0.5Fe, and the balance is Al.

[0024] 1. After melting 10kg of 2024 aluminum alloy, 2024 aluminum alloy powder was prepared by high-pressure inert gas atomization method, with an average particle size of 35 μm.

[0025] 2. Put the above-mentioned 2024 aluminum alloy atomized powder into a hot-working mold whose inner wall is coated with a graphite protective layer, heat it to 850°C with a protective atmosphere, and keep it warm for 60 minutes.

[0026] 3. After the heat preservation is over, place the hot work mold equipped with the 2024 aluminum alloy atomized powder liquid phase system on the vibration table, set the vibration frequency to 20Hz, and apply vibration; when the temperature drops to 620°C, stop the vibration and apply 5MPa Pressure, keep the pressure for 60s.

[0027] 4. Open the mold and pick up the parts.

Embodiment 2（5083

[0028] Implementation example 2 (5083 aluminum alloy)

[0029] The composition of the 5083 aluminum alloy in this embodiment is 0.1Cu-4.5Mg-0.6Mn-0.4Fe-0.12Cr-0.25Zn-0.15Ti, and the balance is Al.

[0030] 1. After melting 10kg of 5083 aluminum alloy, prepare 5083 aluminum alloy powder by high-pressure inert gas atomization method, with an average particle size of 25 μm.

[0031] 2. Put the above-mentioned 5083 aluminum alloy atomized powder into a hot-working mold whose inner wall is coated with a ZrO2 protective layer, heat it to 800°C with a protective atmosphere, and keep it warm for 180 minutes.

[0032] 3. After the heat preservation is over, place the hot work mold equipped with the 5083 aluminum alloy atomized powder liquid phase system on the vibration table, set the vibration frequency to 100Hz, and apply vibration; when the temperature drops to 600°C, stop the vibration and apply 20MPa Pressure, keep the pressure for 20s.

[0033] 4. Open the mold and pick up the ...

Embodiment 3（6061

[0034] Implementation example 3 (6061 aluminum alloy)

[0035] The composition of the 6061 aluminum alloy in this embodiment is 2.5Cu-1.0Mg-0.15Mn-0.7Fe-0.18Cr-0.25Zn-0.15Ti, and the balance is Al.

[0036] 1. After melting 10kg of 6061 aluminum alloy, prepare 2024 aluminum alloy powder by high-pressure inert gas atomization method, with an average particle size of 2 μm.

[0037] 2. Put the above-mentioned 6061 aluminum alloy atomized powder into a hot-working mold whose inner wall is coated with a SiC protective layer, heat it to 700°C with a protective atmosphere, and keep it warm for 300 minutes.

[0038] 3. After the heat preservation is over, place the hot work mold equipped with the 6061 aluminum alloy atomized powder liquid phase system on the vibration table, set the vibration frequency to 200Hz, and apply vibration; when the temperature drops to 580°C, stop the vibration and apply 50MPa Pressure, keep the pressure for 10s.

[0039] 4. Open the mold and pick up the p...

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Abstract

The invention discloses a method for manufacturing an aluminum alloy through powder liquid phase die forging and belongs to the technical field of manufacturing of aluminum alloys in powder metallurgy. The method comprises the following steps: preparing aluminum alloy powder through high-pressure inert gas atomization, forming powder liquid phase, applying vibration and pressure, performing powder liquid phase die forging, and opening the mold for taking a part, and the like. The characteristics that the aluminum alloy atomized powder is fine and high in degree of sphericity are utilized, a semisolid metal processing technology is combined with a powder forging technology, the powder is heated to form lots of liquid phases above the powder sintering temperature, an oxidation film in a nano scale on the surface of the aluminum alloy powder is broken and enters an aluminum alloy matrix by utilizing the pressurization, vibration and activation technology, and a fully-dense diffuse intensified aluminum alloy is directly manufactured. According to the method, the problems generated in the process of manufacturing the fully-dense aluminum alloy through a traditional powder metallurgy process are solved, the material texture is not needed to be specially controlled, the forming performance is extremely high, the process method is simple, the material utilization rate is extremely high, and the method is low-carbon, energy-saving, environment-friendly, low in manufacturing cost and easy for industrial production, and equipment limitation is avoided.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy aluminum alloy preparation, and in particular provides a method for preparing aluminum alloy by powder liquid phase die forging. The method is not only suitable for the preparation of difficult deformed aluminum alloy systems, but also can be used for the preparation of cast aluminum alloys, magnesium alloys and other alloy systems. technical background [0002] The semi-solid metal processing technology that appeared in the 1970s, as an advanced metal processing method, integrates the characteristics of good formability of liquid metal and good mechanical properties of solid metal processing and forming parts, and has developed rapidly in recent years. The use of semi-solid processing methods can produce parts with complex shapes, such as brake cylinders for automobiles, hubs, pistons, connecting rods, oil pump valve bodies, and connecting parts of electronic devices used in aerospace, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C21/00
Inventor 郭志猛陈存广罗骥曹慧钦郭雷辰陈骏叶安平
Owner UNIV OF SCI & TECH BEIJING
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