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Preparation method of high-strength corrosion-resistant high-toughness Al-Mg-Zn-Ag (-Cu) aluminum alloy

An aluminum alloy and corrosion-resistant technology, applied in the field of non-ferrous metal preparation, can solve the problems of reducing the intergranular corrosion resistance of the alloy, amplifying the PLC effect of the alloy, and complicating the alloy manufacturing, so as to improve the elongation, strength and intergranular corrosion resistance. , the effect of improving corrosion resistance

Inactive Publication Date: 2022-05-06
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned invention has the following problems: the fracture toughness is not involved, which limits the application and popularization of the invented alloy; the Cu content in the high-Mg alloy is relatively high, and there is a forming problem in the alloy during the hot rolling process; excessively increasing the Mg content makes the solid in the invented alloy If the concentration of dissolved Mg atoms is greatly increased, the PLC effect of the alloy will be amplified, and in addition, it will reduce the resistance of the alloy to intergranular corrosion and deteriorate the corrosion resistance.
Patent CN-112877554A discloses a preparation method of Al-Mg-Zn-Cu alloy, by increasing the mass ratio of (Zn+Cu) / Mg and adopting intermediate deformation heat treatment process, Al-Mg-Zn-Cu strengthened by T phase The strength of the alloy is increased to the level of the 7000 series alloy, while maintaining high toughness, corrosion resistance and weldability. However, due to the adoption of the deformation heat treatment process, that is, cold rolling during the aging treatment process, the alloy manufacturing is complicated.
[0006] It can be seen that although the above invention improves the strength of the Al-Mg-Zn aluminum alloy, it has the disadvantages of reducing other properties and complicating the preparation process.

Method used

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  • Preparation method of high-strength corrosion-resistant high-toughness Al-Mg-Zn-Ag (-Cu) aluminum alloy
  • Preparation method of high-strength corrosion-resistant high-toughness Al-Mg-Zn-Ag (-Cu) aluminum alloy
  • Preparation method of high-strength corrosion-resistant high-toughness Al-Mg-Zn-Ag (-Cu) aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Melt and cast according to the 1# alloy composition in Table 1; the ingot is heated from room temperature to 410°C with the furnace at a rate of 30°C / h, kept at 8h, and then raised to 470°C at 30°C / h, kept at room temperature for 24h, and then cooled to room temperature ;After homogenizing annealing, surface milling and hot rolling, the hot rolling start temperature is 420°C, the total reduction is >90%, and the thickness after rolling is 6mm; the hot rolled plate is cold rolled, and the 6mm hot rolled plate is first cold rolled to 5mm, then recrystallized and annealed at 365°C for 75min, and then cold-rolled to 2.5mm; the cold-rolled sheet was solution treated in an air furnace at 475°C / 30min, then rapidly quenched in water at 25°C, and then 90°C / 26h+140°C / 20h double-stage aging treatment. According to "GB / T228.1-2010", samples were taken from the aged plate for tensile test, and the test results are shown in Table 2.

Embodiment 2

[0040] Melting and casting according to the 2# alloy composition in Table 1; the ingot was heated from room temperature to 420°C with the furnace at a rate of 30°C / h, kept at 8h, and then raised to 470°C at 30°C / h, kept at room temperature for 24h, and then cooled to room temperature ;After homogenizing annealing, surface milling and hot rolling, the hot rolling start temperature is 430°C, the total reduction is >90%, and the thickness after rolling is 6mm; the hot rolled plate is cold rolled, and the 6mm hot rolled plate is first cold rolled to 5mm, then recrystallized and annealed at 375°C for 75min, and then cold-rolled to 2.5mm; the cold-rolled sheet was solution treated in an air furnace at 480°C / 20min, then rapidly quenched in water at 25°C, and then 90°C / 24h+140°C / 18h double-stage aging treatment. According to "GB / T228.1-2010" and "ASTM B871", samples were taken from the aged plate for tensile and tear tests respectively, and the intergranular Corrosion experiment, re...

Embodiment 3

[0042] Melting and casting according to the 3# alloy composition in Table 1; the ingot is heated from room temperature to 420°C with the furnace at a rate of 30°C / h, kept at 8h, and then raised to 470°C at 30°C / h, kept at room temperature for 24h, and then cooled to room temperature ;After homogenizing annealing, surface milling and hot rolling, the hot rolling start temperature is 430°C, the total reduction is >90%, and the thickness after rolling is 6mm; the hot rolled plate is cold rolled, and the 6mm hot rolled plate is first cold rolled to 5mm, then recrystallized and annealed at 375°C for 75min, and then cold-rolled to 2.5mm; the cold-rolled sheet was solution treated in an air furnace at 480°C / 20min, then rapidly quenched in water at 25°C, and then 90°C / 24h+140°C / 18h double-stage aging treatment. According to "GB / T228.1-2010", samples were taken from the aged plate for tensile test, and the test results are shown in Table 2.

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Abstract

The invention discloses a high-strength corrosion-resistant high-toughness Al-Mg-Zn-Ag (-Cu) aluminum alloy, and belongs to the field of non-ferrous metal preparation. A trace amount of Ag and Cu elements are added on the basis of the existing Al-Mg-Zn alloy, and the Al-Mg-Zn alloy comprises the following chemical components in percentage by mass: 4.0-6.5% of Mg, 3.0-5.5% of Zn, 0.05-0.8% of Ag, less than or equal to 1.0% of Cu, less than or equal to 0.15% of Mn and less than or equal to 0.15% of Ti. 0.20% of Zr, the balance Al and inevitable impurities, and the mass ratio needs to reach (Zn + Cu) / Mglt. 1.0); the aluminum alloy is prepared through the processes of smelting casting, homogenizing annealing, surface milling, hot rolling, cold rolling, recrystallization annealing, cold rolling, solid solution quenching treatment, final deformation heat treatment and the like. The Al-Mg-Zn-Ag (-Cu) alloy prepared according to the process is high in strength, corrosion resistance and fracture toughness are improved, and the Al-Mg-Zn-Ag (-Cu) alloy can be applied to traffic carriers such as automobiles and airplanes.

Description

technical field [0001] The invention belongs to the field of nonferrous metal preparation, in particular to a high-strength, corrosion-resistant, high-toughness Al-Mg-Zn-Ag(-Cu) alloy and a preparation method thereof. Background technique [0002] Due to the practical requirements of energy saving and emission reduction, the demand for lightweight transportation vehicles is becoming more and more urgent in social and economic development. [0003] 5XXX series Al-Mg alloys are one of the first-choice materials to realize the lightweight of transportation vehicles due to their excellent corrosion resistance, good weldability, medium strength and high specific strength, especially in special vehicles and ship structural materials, etc. On the one hand, such as AA5083 and AA5383 and the AA5059 alloy developed on the basis of AA5383 to further increase the content of Mg, Zn, and Mn. Among them, the addition of Mg and Mn improves the strength, and the addition of Zn improves the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/06C22C21/10C22F1/047C22F1/053
CPCC22C1/026C22C1/03C22C21/06C22C21/10C22F1/053C22F1/047
Inventor 张迪刘浩然张震张济山
Owner UNIV OF SCI & TECH BEIJING
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