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Preparation method of ultrahigh-strength aluminum alloy with high creep resistance

A creep performance, aluminum alloy technology, applied in the field of ultra-high strength aluminum alloy preparation with high creep resistance, can solve problems such as poor creep resistance, achieve no coarse grain boundary phase, expand application prospects, room temperature and high temperature The effect of improved creep resistance

Pending Publication Date: 2021-12-17
苏州奥拓博科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing an ultra-high-strength aluminum alloy with high creep resistance, so as to solve the problem of poor creep resistance of high-strength aluminum alloys in the prior art

Method used

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  • Preparation method of ultrahigh-strength aluminum alloy with high creep resistance
  • Preparation method of ultrahigh-strength aluminum alloy with high creep resistance
  • Preparation method of ultrahigh-strength aluminum alloy with high creep resistance

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preparation example Construction

[0031] The preparation method of the high-strength aluminum alloy of the present application comprises the following steps:

[0032] Step (1), the Zn content is 10.0~13.0wt% by composition weight percentage, the Mg content is 1.9~3.2wt%, the Cu content is 1.2~2.2wt%, the Ti content is 0.02~0.2wt%, the Zr content is 0.10-0.20wt%, Sc content is 0.1-0.2wt%, impurity element Si content≤0.05wt%, Fe content≤0.05wt%, and Fe>Si, and the rest are Al raw materials for master alloy fusion. Alloy melting is carried out in a resistance furnace using a graphite crucible. When the temperature of the graphite crucible reaches 200°C±5°C, add preheated raw materials, and the melting temperature is controlled at 760°C±5°C. After the alloy is completely melted, keep it warm for 18- For 22 minutes, cool down to 740°C±5°C for melt treatment, stir, refine and degas and remove slag, then let stand for 8-12 minutes, cool down to 720°C±5°C, cast into metal molds, and cut into pieces after solidificatio...

Embodiment 1

[0038] Al-11Zn-2.45Mg-1.7Cu-0.17Zr-0.2Sc alloy was spray deposited.

[0039] The percentage by weight of the components is that the Zn content is 11wt%, the Mg content is 2.45wt%, the Cu content is 1.7wt%, the Ti content is 0.1wt%, the Zr content is 0.17wt%, the Sc content is 0.2wt%, and the impurity element Si The content of Fe is 0.025wt%, the content of Fe is 0.045wt%, and the rest is Al for master alloy fusion.

[0040] Alloy melting is carried out in a resistance furnace using a graphite crucible. When the temperature of the graphite crucible reaches 200°C, add preheated raw materials. The melting temperature is controlled at 760°C. After the alloy is completely melted, it is kept for 20 minutes and then cooled to 740°C. Melt treatment, stirring, refining, degassing and slag removal, let stand for 10 minutes, cool down to 720°C, cast into metal molds, and cut into Small ingots, as master alloy materials for spray forming.

[0041] Under the condition of inert gas prote...

Embodiment 2

[0051] Al-11Zn-2.45Mg-1.7Cu-0.17Zr-0.3Sc alloy was spray deposited.

[0052] The percentage by weight of the components is that the Zn content is 11wt%, the Mg content is 2.45wt%, the Cu content is 1.7wt%, the Ti content is 0.1wt%, the Zr content is 0.17wt%, the Sc content is 0.3wt%, and the impurity element Si The content of Fe is 0.025wt%, the content of Fe is 0.045wt%, and the rest is Al for master alloy fusion.

[0053] Alloy melting is carried out in a resistance furnace using a graphite crucible. When the temperature of the graphite crucible reaches 200°C, add preheated raw materials. The melting temperature is controlled at 760°C. After the alloy is completely melted, it is kept for 20 minutes and then cooled to 740°C. Melt treatment, stirring, refining, degassing and slag removal, let stand for 10 minutes, cool down to 720°C, cast into metal molds, and cut into Small ingots, as master alloy materials for spray forming.

[0054] Under the condition of inert gas prote...

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Abstract

The invention discloses a preparation method of an ultrahigh-strength aluminum alloy with high creep resistance. The preparation method comprises the following steps: obtaining a prefabricated alloy ingot; wherein the alloy ingot comprises the following components in percentage by mass: 10.0 to 13.0 wt% of Zn, 1.9 to 3.2 wt% of Mg, 1.2 to 2.2 w wt% of Cu, 0.02 to 0.2 wt% of Ti, 0.1 to 0.2 wt% of Zr, 0.1 to 0.3 wt% of Sc, less than or equal to 0.05 wt% of Fe and less than or equal to 0.05 wt% of Si, Fe is greater than Si, and Al is an equilibrium element; under the inert gas condition, induction melting is conducted on the alloy ingot, and after molten alloy liquid is evenly mixed, atomization spray deposition is conducted to obtain a billet; the billet is extruded into a bar in an isothermal extrusion mode; and the bar is subjected to two-stage solid solution heat treatment, the bar subjected to heat treatment is subjected to quenching treatment, and the finished aluminum alloy is obtained. After hot extrusion, the alloy is completely densified, the room-temperature and high-temperature creep resistance of the alloy is greatly improved compared with a traditional ultrahigh-strength aluminum alloy, and the application prospect of the alloy is greatly expanded.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy preparation, in particular to a method for preparing an ultra-high-strength aluminum alloy with high creep resistance. Background technique [0002] Al-Zn-Mg-Cu series (7XXX series) alloys are widely used in aerospace, weaponry and other fields due to their high strength, low density and many other advantages. As a structural material, its service life is required to be as long as more than ten years under some specific working conditions, and its working environment belongs to the generalized creep environment. At present, there are nearly a hundred kinds of Al-Zn-Mg-Cu series aluminum alloys of various composition grades that have been developed in the world, and the corresponding alloy heat treatment standards are also divided into categories, but there is still no system for the creep life of ultra-high-strength aluminum alloys. research and evaluation. Contents of the invention [...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22F1/053B22F3/115B22F3/20B22F3/24
CPCC22C21/10C22F1/053C22F1/002B22F3/115B22F3/20B22F3/24B22F2003/208B22F2003/248
Inventor 李海超谷旭侯霖罗红见
Owner 苏州奥拓博科新材料科技有限公司
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