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High-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof

A processing method and technology for aluminum alloys, applied in the field of aluminum alloys, can solve problems such as limited application scope, difficult control, overburning, etc., and achieve the effects of improving purity, inhibiting precipitation, and improving alloy corrosion resistance and toughness.

Active Publication Date: 2021-12-03
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Sc elements are expensive, which limits their application range
And the above-mentioned patents usually use extreme soaking and solid solution process for heat treatment, and the soaking and solid solution temperature reaches 475°C-485°C
This extreme high temperature heat treatment process is very difficult to control for traditional large-scale ingots, and it is very easy to overfire in actual industrial production, resulting in the inheritance of tissue defects into the final product

Method used

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  • High-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof
  • High-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof
  • High-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A high-strength, toughness and corrosion-resistant 7xxx series aluminum alloy, its composition and weight percentage are: Zn 9.0%, Mg 2.2%, Cu 1.6%, Zr 0.12%, Ti 0.02%, Fe 0.1%, Si 0.08%, Mn 0.08 %, the rest is Al, Zn+Mg+Cu=12.8%, Zn / Mg=4.1, Cu / Mg=0.7.

[0035] The processing method of above-mentioned aluminum alloy comprises the following steps:

[0036] (1) Use aluminum ingots to add intermediate alloys to melt in a melting furnace, and use semi-continuous casting to obtain large-scale φ410mm ingots;

[0037] (2) Carry out homogenization heat treatment on the ingot, slowly raise the temperature from room temperature to 400°C at a heating rate of 50°C / h for 10 hours, then raise the temperature to 475°C at a heating rate of 5°C / h and hold for 48h, then heat at 30°C / h cooling speed for cooling;

[0038] (3) Carry the ingot, saw it, and heat it in an induction furnace before extrusion. The heating temperature of the ingot is 430°C. Extrude the material with an extrusi...

Embodiment 2

[0043] A high-strength, toughness and corrosion-resistant 7xxx series aluminum alloy, its composition and weight percentage are: Zn 9%, Mg 2.0%, Cu 1.0%, Zr 0.2%, Ti 0.15%, Fe 0.2%, Si 0.1%, Mn 0.08 %, the rest is Al, Zn+Mg+Cu=12%, Zn / Mg=4.5, Cu / Mg=0.5.

[0044] The processing method of above-mentioned aluminum alloy comprises the following steps:

[0045] (1) Use aluminum ingots to add intermediate alloys to melt in a melting furnace, and use semi-continuous casting to obtain large-scale φ410mm ingots;

[0046] (2) Carry out homogenization heat treatment on the ingot, slowly raise the temperature from room temperature to 450°C at a heating rate of 10°C / h for 10 hours, then raise the temperature to 480°C at a heating rate of 10°C / h for 60 hours, and heat at 70°C / h cooling speed for cooling;

[0047] (3) Carry the ingot, saw it, and heat it in an induction furnace before extrusion. The heating temperature of the ingot is 430°C. Extrude the material with an extrusion tempera...

Embodiment 3

[0052] A high-strength, toughness and corrosion-resistant 7xxx series aluminum alloy, its composition and weight percentage are: Zn 10%, Mg 2.8%, Cu 1.5%, Zr 0.15%, Ti 0.1%, Fe 0.05%, Si 0.05%, Mn 0.08 %, the rest is Al, Zn+Mg+Cu=14.3%, Zn / Mg=3.6, Cu / Mg=0.5.

[0053] The processing method of above-mentioned aluminum alloy comprises the following steps:

[0054] (1) Use aluminum ingots to add intermediate alloys to melt in a melting furnace, and use semi-continuous casting to obtain large-scale φ410mm ingots;

[0055] (2) Carry out homogenization heat treatment on the ingot, slowly raise the temperature from room temperature to 300°C for 10 hours at a heating rate of 15°C / h, and then heat it to 465°C at a heating rate of 15°C / h for 20 hours, then heat it at 100°C / h cooling speed for cooling;

[0056] (3) Carry the ingot, saw it, and heat it in an induction furnace before extrusion. The heating temperature of the ingot is 430°C. Extrude the material, the extrusion temperatur...

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Abstract

The invention discloses a high-toughness corrosion-resistant 7xxx series alloy and a processing method thereof. The aluminum alloy comprises the following components of, in percentage by weight, 8.8%-10% of Zn, 2.0%-3.0% of Mg, 1.0%-2.5% of Cu, 0.05%-0.2% of Zr, 0.01%-0.15% of Ti, less than or equal to 0.1% of Mn, less than or equal to 0.2% of Fe, less than or equal to 0.1% of Si, less than or equal to 0.15% of the total content of other impurity elements, and the balance Al, wherein Zn + Mg + Cu is greater than or equal to 12% and less than or equal to 15.5%, Zn / Mg is greater than or equal to 3 and less than or equal to 5, and Cu / Mg is greater than or equal to 0.3 and less than or equal to 1. The aluminum alloy has high toughness, good stress corrosion resistance and excellent forming machining performance, and the problems that in the prior art, a high-strength aluminum alloy material is insufficient in toughness matching, poor in stress corrosion and the like are effectively solved; under a peak aging T6 state, the yield strength of alloy bars and profiles is greater than 700MPa, the tensile strength is greater than 730MPa, the ductility is 9% or above, and the conductivity is greater than or equal to 30% IACS; and the prepared bars and profiles can be widely applied to the fields of aviation, spaceflight, nuclear industry, transportation, weapons and the like.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and relates to a high-strength, toughness, and corrosion-resistant 7xxx series aluminum alloy and a processing method thereof. Background technique [0002] In recent years, as the demand for structural weight reduction has become increasingly stringent, especially in the aerospace field, this demand is extremely prominent, so it is more and more important to further improve the strength of lightweight ultra-high-strength aluminum alloys. At present, with the improvement of aluminum metallurgical equipment and technology, high purification and high alloying make it possible to successfully prepare 600MPa aluminum alloys through traditional melting and casting technology, and have reached the level of industrial application, such as 7150 and 7055 aluminum alloys. Because ultra-high-strength aluminum alloys have a certain cost advantage over titanium alloys, ultra-high-strength aluminum all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053
CPCC22C21/10C22C1/026C22F1/053C22F1/002
Inventor 肖翔李伟张文静周泽宇吴浩刘成
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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