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Preparation method of aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy

A technology of aluminum zinc magnesium and aluminum alloy, which is applied in the field of light-weight high-performance structural aluminum alloy materials and powder metallurgy, can solve the problems of cumbersome preparation process, coarse grain, low solid solubility, etc. The effect of low production rate and simple production process

Active Publication Date: 2013-05-08
WUHAN UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, casting is the main method, and the casting method is simple, but there are problems such as coarse grains, serious segregation, loose structure, and low solid solubility, which limit the further improvement of the properties of Al-Zn-Mg-Cu-Zr aluminum alloys; There are relatively few researches on powder metallurgy technology in the field of aluminum alloy, and aluminum alloy powder prepared by aerosol method is generally used. The preparation process is cumbersome, the loss is large, and the cost is high.

Method used

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  • Preparation method of aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy
  • Preparation method of aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy
  • Preparation method of aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy

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Experimental program
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Embodiment 1

[0023] The chemical composition of the experimental alloy is: Al-6.5Zn-2.1Mg-2.1Cu-0.17Zr (mass fraction), the alloy ingredients are 10μm copper powder, 2μm aluminum powder, 20μm magnesium powder, 6~9μm zinc powder and 2~3μm zirconium powder . The element powder is ball milled on a light ball mill at a speed of 150 rpm for 24 hours, and the composite body is sintered in a vacuum hot-pressed sintering furnace at a low temperature and high pressure under vacuum, with a vacuum degree of ≤0.01Pa, a sintering temperature of 550°C, and a sintering time of 3 hours. , the sintering pressure is 80MPa, high-temperature solution heat treatment is carried out on the sintered body sintered by low-temperature, high-pressure vacuum hot pressing, the temperature is 620°C, the vacuum degree is ≤0.01Pa, and the sintering time is 12h. The sintered sample is hot-extruded, extruded The preheating temperature of the front mold is 480°C, the extrusion ratio is 4:1, and the extrusion speed is 1.4m / mi...

Embodiment 2

[0025] The chemical composition of the experimental alloy is: Al-6.1Zn-2.1Mg-1.6Cu-0.25Zr (mass fraction), and the alloy ingredients are 10μm copper powder, 10μm aluminum powder, 20μm magnesium powder, 6~9μm zinc powder and 2~3μm zirconium powder . The element powder is ball milled on a light ball mill at a speed of 250 rpm for 36 hours, and the composite body is sintered in a vacuum hot-pressed sintering furnace at a low temperature and high pressure under vacuum, with a vacuum degree of ≤0.01Pa, a sintering temperature of 550°C, and a sintering time of 2 hours. , the sintering pressure is 60MPa, high-temperature solution heat treatment is carried out on the sintered body sintered by low temperature and high pressure vacuum hot pressing, the temperature is 600°C, the vacuum degree is ≤0.01Pa, and the sintering time is 5h. The sintered sample is subjected to hot extrusion, extrusion The preheating temperature of the front mold is 480°C, the extrusion ratio is 4:1, and the extr...

Embodiment 3

[0027] The chemical composition of the experimental alloy is: Al-5.0Zn-1.7Mg-2.1Cu-0.25Zr (mass fraction), the alloy ingredients are 10μm copper powder, 10μm aluminum powder, 20μm magnesium powder, 6~9μm zinc powder and 2~3μm zirconium powder . The element powder is balled on a light ball mill at a speed of 250 rpm for 36 hours. The composite body is sintered in a vacuum hot-pressed sintering furnace at a low temperature and high pressure. , the sintering pressure is 60MPa, high-temperature solution heat treatment is carried out on the sintered body sintered by low-temperature high-pressure vacuum hot pressing, the temperature is 610°C, the vacuum degree is ≤0.01Pa, and the sintering time is 8h. The sintered sample is hot-extruded, extruded The preheating temperature of the front mold is 480°C, the extrusion ratio is 4:1, and the extrusion speed is 1.4m / min. The extruded parts are subjected to primary solid solution at 470°C for 2 hours, and then heated to 485°C for secondary ...

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Abstract

The invention relates to a preparation method of aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy. Specifically, the method comprises the following steps of: preparing Al, Zn, Mg, Cu and Zr pure element powder for dosing, wherein, by mass, Zn is 5.0-6.5%, Mg is 1.7-2.1%, Cu is 1.6-2.1%, Zr is 0.17-0.25%, and the balance is Al, and the sum of the constituents is 100%; with an element powder method, obtaining a hot-press test sample of aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy by the method of mixing, low-temperature high-pressure vacuum hot pressed sintering, high-temperature solid solution heat treatment, hot extrusion and after heat treatment. The aluminum-zinc-magnesium-copper-zirconium series high-strength aluminum alloy prepared by the preparation method has fine and uniform crystalline grains, the preparation method is simple to operate and has excellent controllability, and expands the industrialized application of the aluminum alloy in the field of medium and high-strength structure materials.

Description

technical field [0001] The invention belongs to the technical field of light-weight high-performance structural aluminum alloy materials and powder metallurgy, in particular to a preparation method of aluminum-zinc-magnesium-copper-zirconium high-strength aluminum alloys. Background technique [0002] With its good physical, chemical and mechanical properties, aluminum alloys are widely used in many important fields of national defense and economic construction. Al-Zn-Mg-Cu alloy belongs to ultra-high-strength aluminum alloy, has high specific strength, and is widely used in the aviation field. The billet-making method of domestic research on ultra-high-strength aluminum alloy is basically the same as that of foreign countries. There are mainly traditional casting, Powder metallurgy, spray forming and electromagnetic stirring casting technology; material processing is mainly to control the microstructure of the material by controlling the processing temperature, deformation ...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/04
Inventor 沈强吴传栋李成章余侃罗国强张联盟方攀
Owner WUHAN UNIV OF TECH
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