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Cu-containing high-strength corrosion-resistant Al-Mg-Si alloy and preparation method thereof

An alloy and corrosion-resistant technology, applied in the field of Cu-containing high-strength corrosion-resistant Al-Mg-Si alloy and its preparation, can solve problems such as unfavorable corrosion resistance of Al-Mg-Si alloy, improve mechanical properties and optimize process parameters , the effect of improving mechanical properties

Pending Publication Date: 2022-06-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of Cu is generally detrimental to the corrosion resistance of Al-Mg-Si alloys because the grain boundary chemistry is sensitive to the addition of Cu

Method used

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  • Cu-containing high-strength corrosion-resistant Al-Mg-Si alloy and preparation method thereof
  • Cu-containing high-strength corrosion-resistant Al-Mg-Si alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A low-content Cu alloy ingot was prepared. The mass fraction of each alloy element was Mg, 0.9%; Si, 1.5%; Cu, 0.2%; Mn, 0.4%; Er, 0.15%; Aluminum alloy ingots are cut and milled. The ingot is subjected to two-stage homogenization heat treatment. The two-stage homogenization process is: the first stage is kept at 300 °C for 8-12 hours; the second stage is kept at 535 °C for 12 hours. After the ingot undergoes homogenization heat treatment, it is then subjected to hot rolling deformation with 85% of the total deformation at a homogenization temperature of 535° C., and air-cooled to room temperature. The hot-deformed alloy was solution treated at 545°C for 30 minutes, water quenched, and aged at 155°C for 10 hours. Further preferably, the solution treatment at 545 °C for 30 min is immediately followed by water quenching, and then the alloy is immediately aged at 155 °C for 10 h.

[0024] The sheet of Example 1 was processed into a tensile specimen along the rolling dire...

Embodiment 2

[0026] A medium-content Cu alloy ingot was prepared. The mass fraction of each alloy element was Mg, 0.9%; Si, 1.5%; Cu, 0.4%; Mn, 0.4%; Er, 0.15%; Zr, 0.15%, and the balance was Al, which The steps are the same as in Example 1, and the tensile test results are listed in 1.

Embodiment 3

[0028] A high-content Cu alloy ingot was prepared. The mass fraction of each alloy element was Mg, 0.9%; Si, 1.5%; Cu, 0.6%; Mn, 0.4%; Er, 0.15%; The steps are the same as in Example 1, and the tensile test results are listed in 1.

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Abstract

The invention discloses a Cu-containing high-strength corrosion-resistant Al-Mg-Si alloy and a preparation method thereof, and belongs to the technical field of non-ferrous metal alloys. The alloy comprises the following chemical element components: 0.8 wt%-1.2 wt% of Mg; si, 1.2 wt% to 1.6 wt%; 0.05 wt% to 0.6 wt% of Cu; mn, 0.2 wt% to 0.6 wt%; 0.01 wt% to 0.2 wt% of Er; the aluminum alloy comprises, by weight, 0.01%-0.2% of Zr and the balance Al. A casting method is adopted to obtain a cast ingot, the cast ingot is subjected to two-stage homogenization heat treatment, and the first stage is kept at 300 + / -10 DEG C for 10 h; at the second stage, heat preservation is conducted for 12 h at the temperature of 535 + / -20 DEG C, hot rolling is conducted, and the deformation And then solid solution aging treatment is carried out, and the aged alloy is subjected to a tensile test and an exfoliation corrosion test. The obtained alloy has high strength and excellent corrosion resistance.

Description

technical field [0001] The invention relates to a Cu-containing high-strength corrosion-resistant Al-Mg-Si alloy and a preparation method thereof, belonging to the technical field of non-ferrous metal alloys. Background technique [0002] 6XXX series aluminum alloys have low density, medium strength, good corrosion resistance and formability, and are widely used in aerospace, rail transit, automobile manufacturing and building materials industries. Mg and Si are the main alloying elements of this series of aluminum alloys, and the mass fractions of Mg and Si are generally lower than 1.5% and 1.8%, respectively. The sum of the two is lower than Mg 2 The maximum solid solubility of Si is 1.85%. This kind of aluminum alloy has good forging and extrusion deformation properties, and is a deformed aluminum alloy that can be strengthened by heat treatment. Precipitation strengthening is the main strengthening method of 6XXX series aluminum alloys. Mg 2 Si is the main strengtheni...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/02C22F1/043C22F1/05
CPCC22C21/02C22C1/026C22F1/043C22F1/05C22F1/002
Inventor 黄晖赵宇魏午荣莉高坤元吴晓蓝文胜平亓鹏聂祚仁王美淋
Owner BEIJING UNIV OF TECH
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