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Preparation method of high-toughness metal-based nanometer composite material

A technology of nanocomposite materials and composite materials, which is applied in the field of preparation of high-strength and tough metal matrix nanocomposites, can solve the problems of small stirring area in friction stir processing, difficulty in preparing uniform nanomaterials, difficult fine-grain strengthening mechanism, etc., to achieve control of crystallization grain size, inhibition of grain growth, and the effect of easy grain size

Active Publication Date: 2012-08-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has three deficiencies: (1) Under the action of frictional heat and mechanical stirring, grain growth and grain refinement proceed simultaneously, so only ultrafine crystals can be obtained, nanocrystals cannot be obtained, and it is difficult to maximize Take advantage of the fine-grain strengthening mechanism; (2) The stirring area of ​​friction stir processing is small and the efficiency is low, making it difficult to prepare large uniform nanomaterials; (3) Although friction stir processing can achieve uniform dispersion of added nanoparticles, it is difficult to achieve Good interfacial bonding with the substrate

Method used

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  • Preparation method of high-toughness metal-based nanometer composite material
  • Preparation method of high-toughness metal-based nanometer composite material
  • Preparation method of high-toughness metal-based nanometer composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Preparation of high strength and toughness AlN / Al nanocomposites.

[0031] like figure 2 Shown is the flow chart of the composite material preparation process.

[0032] Put the spherical pure aluminum powder with a median particle size of 10 μm into a 01-HD experimental grinder and grind it to prepare flake aluminum powder. The ball milling medium is stainless steel balls (diameter 6mm, ball-to-material ratio 20:1), and the solvent is absolute ethanol , the grinding aid is titanate (consumption is 3% of the aluminum powder mass), the mill speed is 352r / min, and the ball milling time is 4h, and the finally prepared flake aluminum powder with a sheet thickness of about 500nm, such as image 3 The SEM photo of the flake powder prepared as shown, the X-ray analysis shows that the grain size is about 50-60nm.

[0033] After the prepared flake powder is suction filtered and dried, it is put into an atmosphere furnace with argon gas to pyrolyze the organic matter (solvent a...

Embodiment 2

[0036] A high-strength and toughness AlN / Al nanocomposite was prepared in the same manner as in Example 1.

[0037] The ball milling time of the original aluminum powder was shortened to 2h, and flake aluminum powder with a thickness of about 1000nm was obtained. The heat treatment temperature was 600°C, and the treatment time was 8h, and a flake AlN / Al powder with a surface AlN film thickness of about 100nm was obtained; Process is identical with embodiment 1. The final composite material has a tensile strength of 220MPa and an elongation of 22.4%.

Embodiment 3

[0039] A high-strength and toughness AlN / Al nanocomposite was prepared in the same manner as in Example 1.

[0040] The ball milling time of the original aluminum powder was shortened to 3h, and flake aluminum powder with a thickness of about 750nm was obtained. The heat treatment temperature was 550°C, and the treatment time was 6h, and a flake AlN / Al powder with a surface AlN film thickness of about 50nm was obtained; Process is identical with embodiment 1. The finally obtained composite material has a tensile strength of 250 MPa and an elongation of 18%.

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Abstract

The invention provides a preparation method of a high-toughness metal-based nanometer composite material and belongs to the technical field of composite materials. The preparation method provided by the invention comprises the following steps of: firstly, using an atmosphere heat treatment process, generating a layer of a nanometer ceramic thin film on the sheet-shaped metal powder through reaction in-situ; and then carrying out densifying treatment by using a powder metallurgical process, so as to obtain the large compact metal-based composite material. The metal-based composite material prepared by the invention has a metal / ceramic alternative laminated structure, wherein a ceramic layer can be used for effectively restraining the reply of a metal layer and the crystal grain growth, improving the high-position wrong storage capability, keeping a nanometer crystal matrix structure, and causing the rotation and inactivation of fissures, so as to realize mechanical properties matched with the high toughness. The preparation method provided by the invention is simple, convenient and practicable, can be used for realizing the macro-quantized preparation of the large-size composite material, and is good for prompting engineering applications of the metal-based nanometer composite material.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing a high-strength and tough metal-based nanocomposite material. Background technique [0002] With the advancement of the global energy-saving, environmental protection and sustainable development strategy, the proportion of lightweight and high-strength materials in product design is increasing. Compared with their corresponding coarse-grained materials, ultra-fine-grained / nano-crystalline metal materials have become a potential new generation of lightweight structural materials due to their ultra-high strength. However, with the refinement of the material structure, especially after the grains are refined to submicron and nanometer levels, the plasticity and toughness of the material decrease sharply, showing overall brittleness, which limits the engineering application of ultrafine-crystalline / nanocrystalline metals. Therefore, while maintaini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04B22F1/00B22F9/04
Inventor 李志强怯喜周范根莲张荻
Owner SHANGHAI JIAO TONG UNIV
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