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7-series aluminum alloy profile and preparation method thereof

A technology of aluminum alloy profile and mass percentage, which is applied in the field of aluminum alloy, can solve the problems of general toughness and corrosion resistance strength, achieve high mechanical properties and fracture toughness values, improve yield strength and tensile strength, and improve corrosion resistance Effect

Active Publication Date: 2019-02-01
SHANDONG NANSHAN ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although 7055 high-strength aluminum alloys are widely used in aircraft, the toughness and corrosion resistance of the prior art 7055 alloys are mediocre relative to their strength

Method used

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  • 7-series aluminum alloy profile and preparation method thereof
  • 7-series aluminum alloy profile and preparation method thereof
  • 7-series aluminum alloy profile and preparation method thereof

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preparation example Construction

[0023] On the other hand, an embodiment of the present invention provides a method for preparing a 7-series aluminum alloy profile, which includes the following steps:

[0024] S1. Alloy smelting: smelting aluminum raw materials and other alloy raw materials into a melt, sampling and analyzing, and controlling the elemental composition of the melt in terms of mass percentage: Si: ≤0.06%, Fe: ≤0.08%, Cu: 2.10-2.40 %, Mg: 1.90-2.10%, Mn: ≤0.05%, Cr: ≤0.02%, Zn: 7.85-8.25%, Ti: ≤0.06%, Zr: 0.10-0.16%, Be: 0.002-0.005%, other individual Element ≤ 0.030%, the total amount of other impurity elements ≤ 0.100%, the balance is Al;

[0025] Among them, aluminum raw materials include 7055 aluminum alloy scrap and 99.9% remelted aluminum ingots. The purpose of adding a certain proportion of 7055 aluminum alloy waste is to have more fine "crystal nuclei" in the aluminum alloy melt, to obtain a more uniform and finer ingot, and to provide better raw materials for improving the fracture tough...

Embodiment 1

[0059] This embodiment provides a 7-series aluminum alloy profile, which is prepared by the following preparation method:

[0060] Raw materials are prepared according to the weight fraction composition of alloy elements of 7055 aluminum alloy: Si: 0.06%, Fe: 0.05%, Cu: 2.26%, Mg: 2.10%, Mn: 0.05%, Cr: 0.01%, Zn: 8.15%, Ti: 0.04%, Zr: 0.13%, Be: 0.003%, other individual elements ≤ 0.030%, the total amount of other impurity elements ≤ 0.100%, the balance is Al, 35% of 7055 aluminum alloy extrusion waste and aluminum content is 99.9% The remelted aluminum ingots are added into the melting furnace together. After the molten aluminum is melted, other alloy element components are added in turn for melting. The melting temperature is 745°C, so that the raw materials are completely melted to obtain a 7055 aluminum alloy melt; The body is transferred to the holding furnace and refined in the furnace at 740°C. The STAS refining process is adopted. The proportion of argon-chlorine mixed...

Embodiment 2

[0067] This embodiment provides a 7-series aluminum alloy profile, which is prepared by the following preparation method:

[0068] Raw materials are prepared according to the weight fraction composition of alloy elements of 7055 aluminum alloy: Si: 0.05%, Fe: 0.08%, Cu: 2.39%, Mg: 1.90%, Mn: 0.04%, Cr: 0.02%, Zn: 8.01%, Ti: 0.06%, Zr: 0.14%, Be: 0.002%, other individual elements ≤ 0.030%, the total amount of other impurity elements ≤ 0.100%, the balance is Al, 35% of 7055 aluminum alloy extrusion waste and aluminum content is 99.9% The remelted aluminum ingots are added into the melting furnace together. After the molten aluminum is melted, other alloy element components are added in turn for melting. The melting temperature is 745°C, so that the raw materials are completely melted to obtain a 7055 aluminum alloy melt; The body is transferred to the holding furnace and refined in the furnace at 735°C. The STAS refining process is adopted. The proportion of argon-chlorine mixed...

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Abstract

The invention relates to the field of aluminum alloys, and provides a 7-series aluminum alloy profile and a preparation method thereof. The 7-series aluminum alloy profile comprises the following components of, by mass, less than or equal to 0.06% of Si, less than or equal to 0.08% of Fe, 2.10%-2.40% of Cu, 1.90%-2.10% of Mg, less than or equal to 0.05% of Mn, less than or equal to 0.02% of Cr, 7.85%-8.25% of Zn, less than or equal to 0.06% of Ti, 0.10%-0.16% of Zr, 0.002%-0.005% of Be and the balance Al, wherein the content of other single element is less than or equal to 0.030%, and the total amount of other impurity elements is less than or equal to 0.100%. The preparation method comprises the following steps that aluminum raw materials and other alloy raw materials are smelted into melt, refining treatment is conducted on the melt, then casting into a rod is conducted, and then homogenization treatment, extrusion treatment, solid solution heat treatment, stretching and aging treatment are conducted to obtain the profile. The comprehensive performance of the profile is remarkably improved, and the fracture toughness value is high.

Description

technical field [0001] The invention relates to the field of aluminum alloys, in particular to a 7-series aluminum alloy profile and a preparation method thereof. Background technique [0002] 7055 aluminum alloy is a new type of Al-Zn-Mg-Cu series ultra-high-strength aluminum alloy developed by Alcoa Corporation of America. It has many advantages such as excellent corrosion resistance and excellent fatigue crack growth resistance. It is one of the main structural materials in the aerospace field. It is suitable for the manufacture of aircraft skins, spars, bulkheads, landing gear components, and hydraulic system components. Foreign Research on this alloy has matured and it has been applied to Boeing 777 and A380 airliners. At present, domestic research on this alloy is still in its infancy. [0003] Although 7055 high-strength aluminum alloys are widely used in aircraft, the toughness and corrosion resistance of the 7055 alloys in the prior art are mediocre relative to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/10C22F1/053
CPCC22C1/026C22C1/03C22C1/06C22C21/10C22F1/002C22F1/053
Inventor 程仁策姜海涛张启东高盼盼隋信增杨亚平李莹
Owner SHANDONG NANSHAN ALUMINUM
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