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High-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy and heat treatment method

A heat treatment method and aluminum alloy technology, which are applied in the fields of super corrosion-resistant aluminum alloy materials and heat treatment, high Zn, high Mg, low Cu super corrosion-resistant aluminum alloys and heat treatment, which can solve the problem of low ingot yield, strength and toughness and Corrosion resistance can not be taken into account and other problems, to achieve the effect of high ingot yield, shorten solid solution time, and avoid pitting corrosion

Inactive Publication Date: 2013-04-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low ingot yield and inability to balance strength, toughness and corrosion resistance in the existing Al-Zn-Mg-Cu super-strength aluminum alloy, the present invention provides an ingot with high yield and no residual crystal High-Zn, high-Mg, low-Cu super corrosion-resistant aluminum alloy with phase and tensile strength above 650MPa, easy to realize industrial production and heat treatment method

Method used

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  • High-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy and heat treatment method
  • High-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy and heat treatment method
  • High-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy and heat treatment method

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Effect test

Embodiment 1

[0052] Al-8.3Zn-2.41Mg-1.2Cu-0.16Zr (wt.%) alloy was prepared by ingot metallurgy, and its specific composition is shown in Table 1. The raw materials used are high-purity aluminum ingots, industrial pure zinc, industrial pure magnesium, aluminum-copper master alloy, aluminum-zirconium master alloy, and the melting furnace is a resistance heating furnace. The smelting-semi-continuous casting process adopted is: furnace loading (putting high-purity aluminum into the melting furnace) → melting (adding industrial pure zinc, aluminum-copper master alloy, aluminum-zirconium master alloy into the melting furnace, and then adding industrial pure zinc , industrial pure magnesium) → slag removal → stirring → refining (760 ° C ~ 800 ° C) → slag removal → standing (10 ~ 20 minutes) → semi-continuous casting (720 ~ 740 ° C). There is no cracking phenomenon in the ingot. The ingot is subjected to 410°C / 4h+460°C / 24h homogenization heat treatment, the ingot is peeled off, and hot extrusion ...

Embodiment 2

[0054] The Al-8.3Zn-2.41Mg-0.8Cu-0.16Zr (wt.%) alloy was prepared by ingot metallurgy, and its specific composition is shown in Table 1. The raw materials used are high-purity aluminum ingots, industrial pure zinc, industrial pure magnesium, aluminum-copper master alloy, aluminum-zirconium master alloy, and the melting furnace is a resistance heating furnace. The smelting-semi-continuous casting process adopted is: furnace loading (putting high-purity aluminum into the melting furnace) → melting (adding industrial pure zinc, aluminum-copper master alloy, aluminum-zirconium master alloy into the melting furnace, and then adding industrial pure zinc , industrial pure magnesium) → slag removal → stirring → refining (760 ° C ~ 800 ° C) → slag removal → standing (10 ~ 20 minutes) → semi-continuous casting (720 ~ 740 ° C). There is no cracking phenomenon in the ingot. The ingot is subjected to 410°C / 4h+460°C / 24h homogenization heat treatment, the ingot is peeled off, and hot extrus...

Embodiment 3

[0060] The Al-6.7Zn-2.3Mg-1.2Cu-0.16Zr (wt.%) alloy was prepared by ingot metallurgy, and its specific composition is shown in Table 1. The raw materials used are high-purity aluminum ingots, industrial pure zinc, industrial pure magnesium, aluminum-copper master alloy, aluminum-zirconium master alloy, and the melting furnace is a resistance heating furnace. The smelting-semi-continuous casting process adopted is: furnace loading (putting high-purity aluminum into the melting furnace) → melting (adding industrial pure zinc, aluminum-copper master alloy, aluminum-zirconium master alloy into the melting furnace, and then adding industrial pure zinc , industrial pure magnesium) → slag removal → stirring → refining (760 ° C ~ 800 ° C) → slag removal → standing (10 ~ 20 minutes) → semi-continuous casting (720 ~ 740 ° C). There is no cracking phenomenon in the ingot. The ingot is subjected to 410°C / 4h+460°C / 24h homogenization heat treatment, the ingot is peeled off, and hot extrusi...

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Abstract

The invention discloses a high-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy and a heat treatment method. The alloy comprises the following components by mass percentage: 6.5-8.3% of Zn, 2.3-3.0% of Mg, 0.8-1.2% of Cu, 0.1-0.2% of Zr, less than 0.15% of Fe, less than 0.1% of Si, and the balance of Al. A preparation method of the alloy comprises the steps of blending, smelting, semi-continuous casting, homogenizing, thermoplastic deformation, short time solid solution, and ageing heat treatment. For the high-Zn, high-Mg and low-Cu ultrahigh-strength corrosion-resisting aluminum alloy prepared with the method, the hardness (HV) is 185-209, the tensile strength sigma b is greater than or equal to 650Mpa, the percentage elongation delta is greater than or equal to 7%, the pitting resistance is high, the cast ingot yield is high, and the stress corrosion resistance is further improved while the mechanical property is kept after multiple regression reageing treatment. The alloy and the heat treatment method solve the problems that the cast ingot yield in the existing high-copper Al-Zn-Mg-Cu ultrahigh-strength aluminium alloy is low, and the strength, toughness and corrosion resistance cannot be compromised. The heat treatment method is simple to operate, and the industrial production is facilitated.

Description

technical field [0001] The invention relates to a super-strong corrosion-resistant aluminum alloy material and a heat treatment method, in particular to a high-Zn, high-Mg, low-Cu super-strong corrosion-resistant aluminum alloy and a heat treatment method, belonging to the technical field of aluminum alloy material preparation. Background technique [0002] Ultra-high-strength Al-Zn-Mg-Cu aluminum alloys with a tensile strength greater than 650MPa are generally alloyed with high Zn, high Mg and high Cu, such as 7055 and 7150. However, the composition of this high-Zn, high-Mg, and high-Cu alloy is close to the maximum solid solution limit of the Al-Zn-Mg-Cu alloy system. Due to the inevitable non-equilibrium solidification phenomenon during alloy ingot casting, a large number of solidified eutectic phases are produced, which reduces the casting capacity. The plasticity of the ingot leads to cracking of the ingot, and the yield of this high-Zn, high-Mg, high-Cu ultra-high-stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
Inventor 陈康华董朋轩陈送义祝昌军孔晓华
Owner CENT SOUTH UNIV
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