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Aluminum alloy and preparation method thereof

A technology of aluminum alloy and aluminum powder, which is applied in the field of metal composite materials, can solve the problems of oxidation of metal aluminum during sintering, low tensile strength of aluminum alloy, and difficulty in sintering and molding of materials, so as to avoid excessive oxidation, improve mechanical properties, and shorten time. Effect

Inactive Publication Date: 2014-04-09
浙江中科应化科技有限公司 +1
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Problems solved by technology

[0004] The prior art also discloses methods for preparing metal matrix composites through powder metallurgy sintering or hot-pressing sintering technology, but for 7-series aluminum alloys, when powder metallurgy sintering or hot-pressing sintering is used, the sintering time is difficult to control , if the sintering time is too long, the metal aluminum will be severely oxidized during the sintering process; if the sintering time is too short, there will be a problem that the material is difficult to sinter and shape, both of which will lead to the tensile strength of the obtained aluminum alloy Low, poor mechanical properties

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  • Aluminum alloy and preparation method thereof
  • Aluminum alloy and preparation method thereof
  • Aluminum alloy and preparation method thereof

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preparation example Construction

[0027] The embodiment of the present invention discloses a method for preparing an aluminum alloy, comprising the following steps:

[0028] 3wt% ~ 20wt% MgZn 2 Nano powder, 0.5wt%-2wt% copper powder and 79wt%-96wt% aluminum powder are ball-milled and mixed to obtain a mixed powder;

[0029] Press-molding the mixed powder to obtain a green body;

[0030] The green body is heated to a semi-solid state under the protection of an inert gas, kept warm and pressurized to obtain an aluminum alloy.

[0031] In the method for preparing aluminum alloy in the present invention, copper powder and aluminum powder are used as raw materials, and the particle diameters of the copper powder and aluminum powder are preferably less than 1 micron; Added MgZn 2 nanopowder, the MgZn 2 The particle diameter of nanopowder is preferably less than 100 nanometers, helps to guarantee the MgZn that contains in the aluminum alloy of preparation. 2 It is nano-scale, so that fine nano-scale reinforcemen...

Embodiment 1

[0052] Take 24g of magnesium powder with a purity of 98% and a particle size of 200 mesh, 130g of zinc powder with a purity of 98% and a particle size of 200 mesh and put them into a grinding tank with a ball-to-material ratio of 10:1, and the grinding tank is placed in a GN-2 high-energy ball mill After ball milling for 2 hours, the mixed powder taken out was solid-phase reacted in an argon atmosphere protection furnace at 460°C for 2 hours, and the obtained micron-sized MgZn 2 , and then crushed by ball milling for 10 minutes to obtain MgZn 2 Nano powder.

[0053] Carry out XRD analysis to the nanopowder that obtains, the result sees figure 1 , figure 1 MgZn prepared for Example 1 2 The XRD diffraction pattern of nanopowder, result shows, the nanopowder prepared by embodiment is MgZn 2 ,

[0054] Calculated by the Scherrer formula, the obtained MgZn 2 The crystal grains of the nanopowder are smaller than 100 nanometers.

Embodiment 2

[0056] Get the MgZn prepared by 0.15g embodiment 1 2 Nano-powder, 0.05g copper powder and 4.8g aluminum powder were ball milled and mixed for 1.5h, and the obtained mixed powder was put into a steel mold and formed under a pressure of 350MPa. After the formed sample was wrapped with copper foil, it was placed in two Between the anvils, the samples were supported on all sides by pyrophyllite. Heating under the condition of argon, the temperature is 580°C, keeping the temperature for 3 minutes and then pressurizing to 200MPa to obtain a high-strength aluminum alloy.

[0057] The obtained aluminum alloy was polished, and the relative density and tensile strength were measured. The results showed that the relative density of the obtained aluminum alloy was 99.7%, and the tensile strength was 512MPa.

[0058] The obtained aluminum alloy is analyzed by scanning electron microscope, the results can be found in figure 2 , figure 2 The scanning electron microscope picture of the a...

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Abstract

The invention provides a preparation method for an aluminum alloy. The method comprises the following steps of: ball-milling and mixing 3 to 20 weight percent of MgZn2 nanopowder, 0.5 to 2 weight percent of copper powder and 79 to 96 weight percent of aluminum powder to obtain mixed powder; performing pressure forming on the mixed powder to obtain a blank; and heating the blank under the protection of inert gas until the blank is in a semi-solid state, preserving heat, and pressurizing to obtain the aluminum alloy. The invention also provides the aluminum alloy prepared by the method. The aluminum alloy comprises 3 to 20 weight percent of MgZn2, 0.5 to 2 weight percent of copper and 79 to 96 weight percent of aluminum. MgZn2 particles serving as a reinforcing phase are small, are uniformly distributed in an aluminum substrate and have good microstructures, so that the aluminum alloy prepared by the method has high tensile strength and mechanical property.

Description

technical field [0001] The invention relates to the field of metal composite materials, in particular to an aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum is a metal element widely distributed in the earth's crust. Pure aluminum has the advantages of light weight, low density, and good plasticity, and can be processed by various machines. However, the strength of pure aluminum is low, so various aluminum alloys that can be used as structural materials can only be obtained through alloying. Aluminum alloy is based on aluminum, and metals such as copper, silicon, magnesium, zinc, manganese, nickel, iron, titanium, chromium or lithium can be added according to different needs. Aluminum alloy has low density, high strength and specific stiffness, and is mainly used in machinery manufacturing, transportation machinery, power machinery and aviation industry. [0003] The 7-series aluminum alloy is a high-strength aluminum alloy, which has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C21/10C22C21/06
Inventor 马贤锋汤华国赵伟
Owner 浙江中科应化科技有限公司
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