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Method for improving corrosion resistance of 750MPa level ultrahigh strength aluminium alloy

A corrosion-resistant, ultra-high-strength technology, which is applied in the field of ultra-high-strength aluminum alloy preparation, can solve the problems that solid solution and aging cannot be well eliminated, the level of ultra-high strength cannot be reached, and the bonding strength of grain boundaries is reduced, so as to improve the grain boundary. Boundary morphology and organizational structure, good application requirements, and the effect of improving corrosion performance

Inactive Publication Date: 2018-10-26
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Combining material calculation analysis to achieve such a high strength, the total content of alloy components is basically above 14%. The second phase particles cannot be eliminated well in the subsequent solid solution and aging treatment
The residual second-phase particles at the grain boundaries can easily lead to a decrease in the bonding strength of the grain boundaries, and intergranular cracking is extremely prone to occur during use, which cannot reach the expected ultra-high strength level. At the same time, in a corrosive environment, these large particles The anodic phase dissolves first, resulting in poor corrosion performance
In the current public reports, the alloy is made to achieve higher strength by different methods, but there is no public report on the comprehensive performance of ultra-high-strength aluminum alloys of 750MPa and above, especially the matching of corrosion performance

Method used

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  • Method for improving corrosion resistance of 750MPa level ultrahigh strength aluminium alloy
  • Method for improving corrosion resistance of 750MPa level ultrahigh strength aluminium alloy
  • Method for improving corrosion resistance of 750MPa level ultrahigh strength aluminium alloy

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Embodiment 1

[0021] Using the method for improving the corrosion performance of 750MPa-level ultra-high-strength aluminum alloy deformed products involved in the present invention, the alloy components and weight percentages are: Zn 10.5%, Cu 1.72%, Mg 1.95%, Zr 0.11%, Sc 0.10%, Ti0. 06%, Si 0.06%, Fe 0.08%, the balance is Al, the extruded strip with a thickness of 45mm is solution treated, the solution temperature is 470°C, the holding time is 150min, and the room temperature water quenching. After quenching, pre-stretch the strip at 2.0%, and then carry out cryogenic treatment: from room temperature to -160°C, the cooling rate is 20°C / h, keep the temperature for 20h, then warm up to room temperature, the heating rate is 15°C / h, and then Carry out artificial aging treatment: 100°C / 10h+135°C / 15h. The tensile, fracture toughness and exfoliation corrosion properties of the strip were measured, and compared with the properties of the strip after the same solid solution, pre-stretching and agi...

Embodiment 2

[0026] Using the method for improving the corrosion performance of 750MPa-level ultra-high-strength aluminum alloy deformed products involved in the present invention, the alloy components and weight percentages are: Zn 11.3%, Cu 1.94%, Mg 2.16%, Zr 0.10%, Sc 0.12%, Ti0. 05%, Si 0.07%, Fe 0.06%, the balance is Al, the extruded strip with a thickness of 45mm is solution treated, the solution temperature is 470°C, the holding time is 150min, and the room temperature water quenching. After quenching, the strip is pre-stretched by 2.0%, and then subjected to two cryogenic treatments: from room temperature to -170°C, the cooling rate is 20°C / h, and the temperature is kept for 22h, and then the temperature is raised to room temperature, and the heating rate is 15°C / h , and then carry out artificial aging treatment: 100°C / 12h+140°C / 18h. The tensile, fracture toughness and exfoliation corrosion properties of the strip were measured, and compared with those of the strip after the same ...

Embodiment 3

[0031]Adopting the method for improving the corrosion performance of 750MPa-level ultra-high-strength aluminum alloy deformed products involved in the present invention, the alloy composition and weight percentage are: Zn 11.5%, Cu2.04%, Mg 1.76%, Zr 0.12%, Sc 0.15%, Ti0 .06%, Si 0.04%, Fe 0.08%, the balance is Al, and the extruded strip with a thickness of 45mm is solution treated. The solution temperature is 470°C, the holding time is 150min, and the room temperature water quenching. After quenching, the strip plate is pre-stretched by 2.0%, and then subjected to three cryogenic treatments: from room temperature to -175°C, the cooling rate is 20°C / h, and the temperature is kept for 18h, and then the temperature is raised to room temperature, and the heating rate is 15°C / h. Then carry out artificial aging treatment: 110°C / 15h+135°C / 15h. The tensile, fracture toughness and exfoliation corrosion properties of the strip were measured, and compared with those of the strip after t...

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Abstract

The invention belongs to preparation technologies of ultrahigh strength aluminium alloys, and relates to a method for improving the corrosion resistance of a 750MPa level ultrahigh strength aluminiumalloy. The method comprises the steps that a deformed product is subjected to solid-solution quenching, then one to three times of subzero treatment is conducted, and at last aging treatment is conducted. A large amount of dislocations and subgrains which are in interaction can be formed through the method; grain boundary intermittent precipitated phases are promoted to be formed; the corrosion resistance can be obviously improved under the condition that the alloy strength level is maintained at the 750MPa level after aging; and meanwhile the organization structure is more stable. The methodis suitable for high-performance 750MPa level ultrahigh strength aluminium alloy plates or extruded profiles used in the fields of aviation, spaceflights and weapons. The plates or the extruded profiles after hot working are subjected to solid-solution treatment to form a supersaturated solid solution, a certain extent of recrystallization is controlled to be generated, a large amount of vacancies, atomic clusters, and dislocations and subgrains which are in interaction are formed in the subsequent subzero treatment process, the grain boundary organization structure of the alloy after artificial aging treatment is improved, and the intermittent precipitated phase structure is promoted to be formed.

Description

technical field [0001] The invention belongs to the preparation technology of ultra-high-strength aluminum alloys, and relates to a method for improving the corrosion performance of 750MPa-level ultra-high-strength aluminum alloys. Background technique [0002] Ultra-high-strength aluminum alloy has the advantages of low density, high strength, superior machinability, high specific strength and good corrosion resistance. It is widely used in aerospace and other defense industries, and is one of the main structural materials in the aerospace industry. With the continuous improvement of the requirements of high life and low cost in aerospace, the requirements for structural materials are also continuously improved. Ultra-high-strength aluminum alloys with excellent comprehensive properties have been further widely used due to their excellent comprehensive properties and high specific strength. [0003] Driven by the idea of ​​high-strength design in the past, researchers have ...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22F1/053
Inventor 陈高红陈军洲何维维李国爱汝继刚郝敏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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