High-strength, light, corrosion-resistant and weldable Al-Zn-Mg alloy and preparation method

An alloy, lightweight technology, applied in the light, corrosion-resistant, weldable Al-Zn-Mg alloy and preparation, high-strength field, can solve the problems of poor corrosion resistance, inability to strengthen the alloy, and the alloy cannot be welded, etc. To achieve the effect of strong anti-corrosion ability

Active Publication Date: 2013-12-25
HUNAN UNIV
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Problems solved by technology

(2) More heavy metal element Cu is generally added to the alloy, which not only increases the density of the alloy, reduces the specific strength of the alloy, but also makes the alloy unusable for welding
Or form S phase in alloys with higher Cu element content (Al 2 CuMg), whose potential is higher than that of the aluminum substrate, causing corrosion of the surrounding substrate
In general, the corrosion resistance of these alloys is relatively poor
(4) In these commercial alloys with high alloy element content, coarse S phase or T phase is easy to precipitate during hot processing such as casting or rolling extrusion. These second phases not only cannot strengthen the alloy, but will give Detrimental effect on fracture toughness, corrosion resistance or fatigue life of the alloy
(5) In order to pursue higher mechanical properties, a large amount of rare earth elements are added, which greatly increases the production cost of the alloy. Even if excellent comprehensive properties are obtained, it is difficult to realize civilian use

Method used

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  • High-strength, light, corrosion-resistant and weldable Al-Zn-Mg alloy and preparation method
  • High-strength, light, corrosion-resistant and weldable Al-Zn-Mg alloy and preparation method
  • High-strength, light, corrosion-resistant and weldable Al-Zn-Mg alloy and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, 14 kinds of aluminum alloy components are designed, among which A-1, A-2, A-3, A-4, A-5, and A-6 are all designed according to the alloy components designed in the present invention, and they are all The T precursor phase is the main strengthening phase, and its specific composition is shown in Table 1; the other eight aluminum alloys B-2, B-3, B-4, B-5, B-7, B-9, B-12, B-13 is designed according to the composition of the corresponding alloy number in Table 1, and its specific composition is shown in Table 1;

[0064] The 14 kinds of aluminum alloys are casted into a round billet with a diameter of 124 mm, then the inclusion layer on the surface of the ingot is removed by turning, and the ingot is processed into a square ingot with a thickness of 100 mm;

[0065] The billet adopts a multi-level homogenization treatment system: the square ingot is heated with the furnace, and the temperature is raised from room temperature to 460°C in 120 minutes, the...

Embodiment 2

[0073] Three full commercial sized ingots with an alloy composition as defined above for the A-3 alloy were cast for pilot production testing. The measured chemical compositions of the three ingots are listed in Table 2 (A-3-1, A-3-2, A-3-3). A circular billet with a diameter of 124 mm and a length of 0.5 m is cut off to obtain a square ingot with a width and a thickness of 100 mm. The billet adopts a multi-level homogenization treatment system: the ingot is heated up with the furnace, and the temperature is raised from room temperature to 460°C in 120 minutes, then kept for 12 hours, and then heated to 480°C in 120 minutes, kept for 24 hours, and then air-cooled or water-cooled Or cool with the furnace. Then, a plate with a thickness of 15 mm is obtained through multiple passes of hot rolling at a temperature of 400° C., and then straightened by cold rolling, so that the final thickness of the plate is 12 mm. The plate is subjected to artificial age hardening treatment, the...

Embodiment 3

[0087] The design alloy composition is (wt%): Zn9.2, Mg3.4, Cu0.01, Zr0.08, Cr0.03, Ti0.05, Mn0.04, the balance is Al and unavoidable impurity elements, impurities The total amount of elements is less than or equal to 0.3;

[0088] Step 1: Casting

[0089] Take the alloy components according to the designed alloy composition ratio, heat to 730°C to melt, remove impurities and degassing, let it stand for 5 minutes, and cast to obtain a round ingot with a diameter of 124mm, and then remove the inclusions on the surface of the ingot by turning layer, and process the ingot into a 100mm thick square ingot;

[0090] Step 2: Homogenization

[0091] Raise the temperature of the square ingot to 450°C at a heating rate of 1°C / min, keep it warm for 0.5 hours, then raise the temperature to 470°C at a heating rate of 0.1°C / min, keep it warm for 16 hours, then air cool to obtain a square ingot after homogenization treatment ;

[0092] Step Three: Thermoplastic Deformation

[0093] Afte...

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Abstract

The invention relates to a high-strength, light, corrosion-resistant and weldable Al-Zn-Mg alloy and a preparation method, and belongs to the technical field of Al-Zn-Mg high-strength aluminum alloy preparation. The Al-Zn-Mg alloy is prepared, by mass ratio, from 6.8-9.2% Zn, 2.0-3.4% Mg, 0.08-0.30% Zr, and the balance of Al and unavoidable impurity elements, wherein the Mg : Zn is 0.28-0.42, the total quantity of the impurity elements is smaller than or equal to 0.3%, and in the impurity elements, the content of Cu is smaller than or equal to 0.1% of the total quantity of the alloy. The main precipitated strengthening phase of the Al-Zn-Mg alloy is a T precursor phase, the chemical formula of the T precursor phase is Al2+x+yMg3-xZn3-y, wherein x is larger than zero and smaller than three, and y is larger than zero and smaller than three. The hardness of the Al-Zn-Mg alloy is 205-214 HV after the Al-Zn-Mg alloy is processed by T6 aging, and the strength of the Al-Zn-Mg alloy is equivalent to that of a 7055 commercial alloy, while the density of the Al-Zn-Mg alloy is lower than that of the 7055 commercial alloy. The Al-Zn-Mg alloy has the advantages of being light, high-strength, weldable, strong in intergranular-corrosion-resistance and exfoliation corrosion resistance, and suitable for many kinds of high-strength weldable products such as high-speed trains and airplane structural components.

Description

technical field [0001] The invention relates to a high-strength, light-weight, corrosion-resistant and weldable Al-Zn-Mg alloy and a preparation method thereof, belonging to the technical field of Al-Zn-Mg high-strength aluminum alloy preparation. Background technique [0002] The currently known commercially most widely used ultra-high-strength aluminum alloys are based on the Al-Zn-Mg-Cu system. A comprehensive study of various patent documents on 7000 series aluminum alloys shows the following problems: (1) In order to improve the strength of the alloy, the commonly used method is to increase the content of the main alloying elements in the alloy, especially the content of heavy elements Zn or Cu, such as In the ultra-high-strength aluminum alloy AA7055 (7.6-8.4%Zn, 1.8-2.3%Mg, 2.0-2.6%Cu, 0.08-0.25%Zr), which has been commercialized for many years, the total alloy element content is 11.4-13.5%; AA7150 (5.9-6.9%Zn, 2.0-2.7%Mg, 1.9-2.5%Cu, 0.08-0.15%Zr), the total alloy e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
Inventor 陈江华刘吉梓杨修波谢娟刘萍秦芳伍翠兰
Owner HUNAN UNIV
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