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Hybrid strengthened aluminum matrix composite and preparation method thereof

A technology for strengthening aluminum-based and composite materials, which is applied in the field of casting metal-based composite materials and its preparation, can solve the problems of high strength and toughness of composite materials, uneven distribution of reinforced particles, etc., achieve high toughness, improve various properties, combine Good results

Active Publication Date: 2017-12-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the above defects or improvement needs of the prior art, the present invention provides a hybrid reinforced aluminum matrix composite material and its preparation method. High-energy ball milling and ultrasonic-assisted stirring technology are used to prepare hybrid reinforced aluminum-based composite materials. The invention solves the problem of uneven distribution of reinforced particles in previous particle-reinforced aluminum-based composite materials, and the strength and toughness of the composite materials are relatively high.

Method used

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  • Hybrid strengthened aluminum matrix composite and preparation method thereof
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preparation example Construction

[0042] figure 2 It is a schematic flow chart of the preparation method of the present invention. It can be seen from the figure that a preparation method for preparing an aluminum-based composite material with added nanoparticles hybrid reinforcement mainly includes the following steps:

[0043] First, through dry high-energy ball milling, nano-sized SiC powder, other nanoparticles, and micron-sized aluminum or aluminum alloy powder are mixed to prepare millimeter-sized composite particles;

[0044] Then, using a mold and a pressure device, the millimeter-scale composite particles are pressed into a prefabricated intermediate alloy block; after the intermediate alloy block is added to the molten aluminum and melted, an ultrasonic-assisted stirring process is applied to prepare an aluminum-based composite material with excellent performance by adding nanoparticle hybrid reinforcement .

[0045] Concrete preparation process steps are as follows:

[0046] (1) Dosing and mixing...

Embodiment 1

[0057] The target components and weight percentages of the composite material in this embodiment are: SiC particles 1%, Al 2 o 3 Particles 1%, the balance is aluminum alloy ZL101 (that is, ZAlSi7Mg). Concrete preparation method is:

[0058] (1) SiC and Al with an average particle size of 20nm 2 o 3 Granules and pure aluminum powder with an average particle size of 20 μm are dosed in a mass ratio of 1:1:23.

[0059] (2) Through dry high-energy ball milling, SiC, Al 2 o 3 Millimeter-sized composite particles with a particle content of 4% by weight, respectively. The formed millimeter-scale composite particles have a particle size of 1 mm.

[0060] (3) Using a mold and a pressure device, the millimeter-scale composite particles are pressed into a prefabricated intermediate alloy block with a diameter of 80 mm and a height of 50 mm, the pressing pressure is 30 MPa, and the theoretical density of the alloy block is greater than 85%.

[0061] (4) Add pure aluminum or aluminu...

Embodiment 2

[0068] The target components and weight percentages of the composite material in this embodiment are: SiC particles 2%, Al 2 o 3 Particles 2%, the balance is aluminum alloy ZL201 (ZAl5CuMn).

[0069] (1) Mix SiC and Al2O3 particles with an average particle size of 40nm and pure aluminum powder with an average particle size of 40μm in a ratio of 1:1:14.7.

[0070] (2) Through dry high-energy ball milling, SiC, Al 2 o 3 Millimeter-sized composite particles with a particle content of 6% by weight, respectively. The diameter of the formed millimeter-scale composite particles is 2mm.

[0071] (3) Using a mold and a pressure device to press millimeter-sized composite particles into a prefabricated intermediate alloy block. Specifically, the millimeter-sized composite particles are pressed into a prefabricated intermediate alloy block with a diameter of 40 mm and a height of 30 mm, the pressing pressure is 10 MPa, and the theoretical density of the alloy block is greater than 85...

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Abstract

The invention discloses a hybrid strengthened aluminum matrix composite and a preparation method of the hybrid strengthened aluminum matrix composite and belongs to the field of casting metal matrix composites. The matrix of the material is aluminum or an aluminum alloy, and nano-sized SiC particles and other nanoparticles are used as the strengthening phase. The invention further provides the method for preparing the hybrid strengthened aluminum matrix composite. The method comprises the following steps that firstly, under vacuum or argon protection, nano-sized SiC powder, one or more of other nanoparticles and micro-sized aluminum or aluminum alloy powder are mixed, and millimeter-sized composite particles are prepared; and then the millimeter-sized composite particles are pressed into a prefabricated intermediate alloy block, then the intermediate alloy block is added to aluminum or aluminum alloy melt, through refining and degassing processing, scum and oxide inclusions are stripped off, mechanical mixing and ultrasonic vibration are applied, the nano-sized ceramic particles are promoted to be uniformly dispersed in the metal melt, and the nano-sized ceramic particle hybrid strengthened aluminum matrix composite is prepared. According to the hybrid strengthened aluminum matrix composite and the preparation method, the multi-phase hybrid strengthened supplementary effect and advantage are fully played, and all the performances of the metal matrix composite is improved remarkably.

Description

technical field [0001] The invention belongs to the field of casting metal-based composite materials and their preparation, and relates to an aluminum-based composite material reinforced by adding nano particles and a preparation method thereof. Background technique [0002] Metal matrix nanocomposites (Metal Matrix Nanocomposites, MMNCs) have excellent properties such as light weight, high specific strength and specific stiffness, and good wear resistance, and have received more and more attention in aerospace, aviation, military, and automotive industries. . Generally speaking, micron-sized ceramic particles are mainly used to improve the hardness and wear resistance of materials, but when the content of reinforcing particles is high, the toughness of materials decreases, which affects the application of metal matrix composites to a certain extent. Adding a small amount of nano-reinforced particles to the matrix metal can not only significantly improve the strength of the...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C32/00C22C1/10C22C1/02
CPCC22C1/1036C22C21/00C22C32/0005C22C32/0052C22C32/0063C22C1/1047
Inventor 吴树森李建宇袁渡吕书林
Owner HUAZHONG UNIV OF SCI & TECH
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