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A kind of high strength and toughness al-zn-mg-cu series aluminum alloy and heat treatment method thereof

A heat treatment method and aluminum alloy technology, which is applied in the field of high strength and toughness Al-Zn-Mg-Cu aluminum alloy and its heat treatment field, can solve the problems of poor stress corrosion resistance, long heat treatment time, insufficient alloy strength, etc., and reduce quenching Sensitivity, Enhanced Overall Performance, Enhanced Effects

Active Publication Date: 2020-08-28
江苏空天轻合金科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the technical defects existing in the prior art, such as: long heat treatment time, insufficient alloy strength, low toughness, low elongation, poor stress corrosion resistance, etc. The present invention provides a high strength and toughness Al-Zn -Mg-Cu series aluminum alloy

Method used

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  • A kind of high strength and toughness al-zn-mg-cu series aluminum alloy and heat treatment method thereof
  • A kind of high strength and toughness al-zn-mg-cu series aluminum alloy and heat treatment method thereof
  • A kind of high strength and toughness al-zn-mg-cu series aluminum alloy and heat treatment method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The composition (by mass percentage) of the high strength and toughness Al-Zn-Mg-Cu aluminum alloy of this embodiment is: Zn: 7.5%, Mg: 1.2%, Cu: 2.0%, Si: 0.02%, Fe: 0.04% , Cr: 0.04%, Ti: 0.02%, Er: 0.1%, Sn: 0.10%, Zr: 0.2%, Ag: 0.2%, Mn: 0.02%, Sc: 0.4%, Y: 0.5%, Yb: 0.25% , Ce: 0.1%, Hf: 0.15%, Ca: 0.01%, V: 0.12%, La: 0.08%, and the balance is Al.

[0055] The high-strength and toughness Al-Zn-Mg-Cu aluminum alloy of the present invention is made into products through smelting, refining, casting, homogenization treatment, hot rolling and heat treatment, wherein the specific steps of the heat treatment process are:

[0056] (1) Two-stage homogenization treatment:

[0057] Put the alloy ingot obtained through smelting, refining and casting into a salt bath furnace, heat up at a heating rate of 2°C / min, and mill the surface after two-stage homogenization treatment at 425°C×24h+465°C×36h, and then Hot rolled to 150mm thick alloy plate;

[0058] (2) Two-stage solid ...

Embodiment 2

[0065] The composition (by mass percentage) of the high strength and toughness Al-Zn-Mg-Cu series aluminum alloy of this example is: Zn: 8.0%, Mg: 1.6%, Cu: 2.2%, Si: 0.03%, Fe: 0.05%, Cr: 0.04%, Ti: 0.03%, Er: 0.15%, Sn: 0.12%, Zr: 0.22%, Ag: 0.25%, Mn: 0.04%, Sc: 0.5%, Y: 0.7%, Yb: 0.28%, Ce: 0.15%, Hf: 0.2%, Ca: 0.02%, V: 0.2%, La: 0.1%, and the balance is Al.

[0066] The high-strength and toughness Al-Zn-Mg-Cu aluminum alloy of the present invention is made into products through smelting, refining, casting, homogenization treatment, hot rolling and heat treatment, wherein the specific steps of the heat treatment process are:

[0067] (1) Two-stage homogenization treatment:

[0068] Put the alloy ingots obtained through smelting, refining and casting into a salt bath furnace, heat up at a heating rate of 3°C / min, and mill the surface after two-stage homogenization treatment at 425°C×24h+465°C×36h, and then Hot rolled to 170mm thick alloy plate;

[0069] (2) Two-stage so...

Embodiment 3

[0076] The composition (by mass percentage) of the high-strength and toughness Al-Zn-Mg-Cu aluminum alloy of this example is: Zn: 8.5%, Mg: 2.0%, Cu: 2.5%, Si: 0.04%, Fe: 0.06% , Cr: 0.04%, Ti: 0.05%, Er: 0.25%, Sn: 0.15%, Zr: 0.25%, Ag: 0.3%, Mn: 0.06%, Sc: 0.6%, Y: 1.0%, Yb: 0.3% , Ce: 0.2%, Hf: 0.25%, Ca: 0.03%, V: 0.25%, La: 0.15%, and the balance is Al.

[0077] The high-strength and toughness Al-Zn-Mg-Cu aluminum alloy of the present invention is made into products through smelting, refining, casting, homogenization treatment, hot rolling and heat treatment, wherein the specific steps of the heat treatment process are:

[0078] (1) Two-stage homogenization treatment:

[0079] Put the alloy ingots obtained through smelting, refining and casting into a salt bath furnace, heat up at a heating rate of 4°C / min, and mill the surface after two-stage homogenization treatment at 425°C×24h+465°C×36h, and then Hot-rolled to 200mm thick alloy plate;

[0080] (2) Two-stage solid s...

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Abstract

The invention specifically relates to a high-strength high-toughness Al-Zn-Mg-Cu aluminum alloy and a heat treatment method thereof. The heat treatment method for the high-strength high-toughness Al-Zn-Mg-Cu aluminum alloy comprises the following concrete steps: putting an alloy ingot into a salt bath furnace for heating, and successively carrying out two-stage homogenization treatment, milling and hot-rolling so as to obtain an alloy sheet; then placing the alloy sheet in the salt bath furnace for two-stage solid solution treatment so as to obtain an alloy having undergone solid solution treatment; putting the alloy having undergone solid solution treatment into liquid nitrogen for quenching; and finally, putting the alloy into a microwave heat treatment furnace for regression and aging treatment, carrying out primary T6 treatment, then carrying out heat-preserved regression treatment, carrying out secondary T6 treatment after water quenching, taking out the alloy from the furnace andcarrying out air-cooling to room temperature so as to obtain the high-strength high-toughness Al-Zn-Mg-Cu aluminum alloy. The heat treatment process of the invention is simple, can realize the precise control of temperature through microwave heating, and has obvious advantages in the aspects of cleanness, high efficiency and energy conservation. The aluminum alloy prepared in the invention has the characteristics of high strength, high toughness and high corrosion resistance, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and in particular relates to a high-strength and toughness Al-Zn-Mg-Cu aluminum alloy and a heat treatment method thereof. Background technique [0002] Age-strengthened Al-Zn-Mg-Cu series high-strength and tough aluminum alloys have the advantages of high specific strength, excellent processability, good stress corrosion resistance, and light weight, and are widely used as important structural materials in the aerospace industry. With the rapid development of the aerospace industry and civil vehicles, the requirements for the strength, toughness, stress corrosion resistance, yield strength, elongation and other properties of advanced lightweight materials are getting higher and higher, and the aerospace field has more and more requirements for aircraft The pursuit of lighter weight, such as the fuselage, has led to the development trend of large-scale and integrated lightweight aluminu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/002C22F1/053
Inventor 唐锋龚明振王宏明李桂荣
Owner 江苏空天轻合金科技有限公司
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