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Method for improving flowing property of cast aluminum-copper alloy

An aluminum-copper alloy and flow performance technology, applied in the field of aluminum-copper alloy casting, can solve the problems of intensified burning loss of other elements, reduce casting performance, prolong smelting time, etc., and achieve the interval of increasing crystallization temperature, improving flow performance and reducing solidification Effect

Active Publication Date: 2021-03-05
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compared with other series of cast aluminum alloys, the current cast aluminum-copper alloys mainly have the following problems: 1) The solidification mode of cast aluminum-copper alloys is mushy solidification, because the crystallization temperature range of the alloy is wide and the temperature distribution of castings It is relatively flat, and in a wide solidification interval, the solidification zone where liquid and solid coexist runs through the entire section, resulting in a higher viscosity and poor fluidity of the alloy liquid
However, when rare earth is added, the smelting time needs to be extended to fully dissolve the rare earth element, which will lead to increased burning of other elements and also reduce the performance of the casting

Method used

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  • Method for improving flowing property of cast aluminum-copper alloy
  • Method for improving flowing property of cast aluminum-copper alloy
  • Method for improving flowing property of cast aluminum-copper alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh 50g of Al powder, 42g of Ti powder, 7g of graphite powder, La 2 o 3 Powder 0.5g and Y 2 o 3 Put 0.5g of powder into a vacuum ball mill jar, put balls into the ball-to-material ratio of 8:1, set the speed at 230rpm, and ball mill for 5 hours under vacuum.

[0050] After ball milling, open the air valve, let it stand for 2 hours, take out the alloy powder, put it into a cold pressing mold, and set the load at 20kN for cold pressing. Then, in an inert atmosphere, high-energy laser self-propagating combustion was carried out with a laser power of 4kW, and 95g of self-propagating product 50Al-42Ti-7C-0.5La-0.5Y was synthesized at high temperature.

[0051] figure 2 It is the SEM image of the self-propagating product 50Al-42Ti-7C-0.5La-0.5Y. from figure 2 It can be seen that there is a dense distribution of Al in the self-propagating product 3 Ti, Al 3 (La,Y) and TiC particles.

[0052] The obtained self-propagating product 50Al-42Ti-7C-0.5La-0.5Y was crushed...

Embodiment 2

[0067] Weigh 50g of Al powder, 40g of Ti powder, 8g of graphite powder, La 2 o 3 Powder 1g and Y 2 o 3 Put 1 g of powder into a vacuum ball mill jar, put balls into balls at a material ratio of 8:1, set the rotation speed at 250 rpm, and ball mill for 5 hours in a vacuum state.

[0068] After ball milling, open the air valve, let it stand for 2 hours, take out the alloy powder, put it into a cold pressing mold, and set the load at 20kN for cold pressing. Then, in an inert atmosphere, high-energy laser self-propagating combustion was carried out with a laser power of 4kW, and 97g of self-propagating product 50Al-40Ti-8C-La-Y was synthesized at high temperature.

[0069] Figure 7 It is the SEM image of the self-propagating product 50Al-40Ti-8C-La-Y. from Figure 7 It can be seen that there is a dense distribution of Al in the self-propagating product 3 Ti, Al 3 (La,Y) and TiC particles.

[0070] The obtained self-propagating product 50Al-40Ti-8C-La-Y was crushed with a...

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Abstract

The invention relates to a method for improving the flowing property of cast aluminum-copper alloy, which comprises the following steps: mixing 50 wt% of Al powder, 40-45 wt% of Ti powder, 3-8 wt% ofgraphite powder, 0.5-1 wt% of La2O3 powder and 0.5-1 wt% of Y2O3 powder, carrying out compression molding, carrying out high-energy laser self-propagating combustion to obtain a self-propagating product, adding the self-propagating product into molten aluminum, diluting until the content of Ti is 5-5.3 wt%, casting obtained intermediate alloy, adding an Al-Ti-C-La-Y intermediate alloy ingot accounting for 0.3-1.5 wt% of the mass of the aluminum-copper alloy into the uniformly-smelted aluminum-copper alloy, and uniformly smelting to obtain an aluminum-copper alloy melt with improved flowing property. According to the method, the Al-Ti-C-La-Y intermediate alloy is introduced into the smelted cast aluminum-copper alloy to refine grains and fuse dendrites, and the crystallization interval of the cast aluminum-copper alloy is shortened, so that the flowing property and the casting property of the cast aluminum-copper alloy are improved, and technical support is provided for producing complex thin-wall aluminum-copper alloy castings.

Description

technical field [0001] The invention belongs to the technical field of aluminum-copper alloy casting, and relates to a method capable of improving the flow performance of cast aluminum-copper alloy. Background technique [0002] As a high-strength aluminum alloy, cast aluminum-copper alloy has been widely used in aerospace, automobile, shipbuilding, military and other fields due to its good room temperature performance and high temperature performance. [0003] Cast aluminum-copper alloy not only has high strength, high modulus, and high corrosion resistance, but also has excellent toughness through heat treatment, and can exhibit excellent comprehensive mechanical properties. It is a lightweight product and realizes the future of casting instead of forging , An ideal material for replacing steel with aluminum. [0004] However, compared with other series of cast aluminum alloys, the current cast aluminum-copper alloys mainly have the following problems: 1) The solidificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/03C22C21/00C22C21/12
CPCC22C1/1036C22C21/003C22C21/12C22C1/1047
Inventor 张国伟牛经纬吕伟泽康圆圆于欢任晓燕
Owner ZHONGBEI UNIV