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Preparation method of high-toughness aluminum base nanometer composite material

A technology of nanocomposite materials and composite materials, which is applied in the field of preparation of aluminum-based nanocomposite materials, can solve the problems of reducing the strength and toughness of composite materials, coarse grains, and difficult industrial applications, so as to enhance strength and toughness, improve severe agglomeration, and fine grains. The effect of microstructure grains

Active Publication Date: 2016-07-20
JIANGSU UNIV
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Problems solved by technology

However, there are still two major problems to be solved in the development of in-situ nanoparticle-reinforced aluminum matrix composites: (1) the huge surface energy of nanoparticles makes the in-situ-generated nanoparticles tend to agglomerate, which greatly reduces the strength and toughness of composite materials; (2) The grains of cast aluminum matrix composites are usually relatively coarse, and only play the role of nano-reinforcement reinforcement, and the strength improvement is limited
[0003] At present, at the same time, improving the strength and toughness of in-situ nanoparticle-reinforced aluminum matrix composites, improving the uniform distribution of nanoparticles, minimizing casting defects of composite materials, and refining the grains of composite materials have become hot research and development at home and abroad. , such as the invention patent of domestic publication number CN104928542A "a kind of nano ZrB 2 In situ preparation method of particle reinforced aluminum matrix composites”, Na 2 B 4 o 7 As a B element donor instead of KBF 4 , with the action of high-energy ultrasound, the dispersion of nanoparticles is enhanced, but high-energy ultrasound is relatively difficult to control, and the effect of improving the agglomeration of nano-enhanced particles is not very satisfactory, and the improvement of material strength and toughness is not significant
In order to make the in-situ nanoparticle-reinforced aluminum-based composite material achieve a large increase in the improvement of nanoparticle dispersion and grain refinement, it can be achieved through large plastic deformation (SPD). An in-situ superplastic pretreatment method for aluminum-matrix composites", in which the as-cast in-situ nanoparticle-reinforced aluminum-matrix composites are subjected to friction stir processing (FSP) treatment, so that the distribution of nanoparticles becomes uniform and superfine Crystalline aluminum matrix composites can achieve superplasticity, but the FSP process is complex and the processing area is extremely limited, making it difficult to realize industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of High Strength and Toughness Aluminum Matrix Nanocomposite ZrB 2 / 6082Al; specific implementation methods:

[0030] (1) with K 2 ZrF 6 and KBF 4 As a reactant, according to generate 3wt.% nanometer ZrB 2 The particles are chemically proportioned, using the melt direct reaction method, at 870 ° C, accompanied by a spiral magnetic field, reacting in the molten 6082Al melt for 30 minutes, refining and removing slag, standing still, and in situ synthesis of nano-ZrB 2 / 6082Al, Nano ZrB 2 The size is 30-80nm, and the obtained cast nano-ZrB 2 / 6082Al was subjected to solution treatment at 560°C×3h, aging treatment at 175°C×8h, and then air-cooled.

[0031](2) In situ nanoparticles reinforced aluminum matrix composite ZrB 2 / 6082Al cut into regular shape, prepared into 120×40×1mm ZrB 2 / 6082Al plate.

[0032] (3) ZrB after cleavage 2 / 6082Al plate surface is degreased, pickled in a mixture of alcohol and acetone with a volume ratio of 1:2, and then mech...

Embodiment 2

[0044] Preparation of High Strength and Toughness Aluminum Matrix Nanocomposite ZrB 2 / 6082Al; specific implementation methods:

[0045] with K 2 ZrF 6 and Na 2 B 4 o 7 As a reactant, according to generate 5wt.% nanometer ZrB 2 The particles are chemically proportioned, using the melt direct reaction method, at 850 ° C, accompanied by high-energy ultrasound, reacting in the molten 6082Al melt for 30 minutes, refining and removing slag, standing still, and in-situ synthesis of nano-ZrB 2 / 6082Al, nano-sized ZrB 2 40-100nm, cumulative rolling pass is 5 passes, rolling process parameters are: rolling temperature is 250°C, deformation rate is 0.2s -1 , the rest of the steps are the same as in Example 1, and finally obtain the high-strength and tough aluminum-based nanocomposite ZrB 2 / 6082Al.

[0046] The obtained composite material was sampled for structural analysis, and the results showed that: nano-ZrB 2 The particle dispersion is also evenly distributed, and the gra...

Embodiment 3

[0049] Preparation of high strength and toughness aluminum matrix nanocomposites (ZrB 2 +TiB 2 ) / 6063Al; specific implementation methods:

[0050] with K 2 ZrF 6 , K 2 TiF 6 and KBF 4 As a reactant, according to generate 3wt.%ZrB 2 Granules, 1wt.% TiB 2 The particles were stoichiometrically proportioned, using the melt direct reaction method, at 900 ° C, accompanied by spiral magnetic field stirring, mechanical stirring, reacting in the molten 6063Al melt for 30 minutes, refining and removing slag, standing still, in situ synthesis of cast (ZrB 2 +TiB 2 ) / 6063Al composite material, ZrB 2 Size 40-100nm, TiB 2 The size is 380-420nm, and the obtained as-cast composite material is subjected to solution treatment at 540°C×3h, aging treatment at 190°C×9h, and then air-cooled. (ZrB 2 +TiB 2 ) / 6063Al rolling process parameters are: rolling temperature is 275°C, rolling speed is 0.15s -1 , the number of overlapping rolling is 7 passes. All the other steps are the same as...

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Abstract

The invention relates to the field of preparation of aluminum base nanometer composite materials, in particular to a preparation method of a high-toughness aluminum base nanometer composite material. Firstly, an in-situ synthesis method is adopted to prepare a nanometer particle reinforced aluminum base composite material; then, a prepared cast composite material is cut to plates with a certain thickness and regular shapes, and the surface degreasing treatment is performed; and finally, the degreased plates are stacked and fixed, and multiple times of ply rolling deformation treatment are performed to obtain the composite material with uniformly dispersed nanometer reinforced bodies and fine matrix grains. In the prepared aluminum base nanometer composite material, because of dispersibility improvement of the nanometer reinforced particles, refining of the matrix grains and reduction of casting defects, the toughness of the composite material is greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of aluminum-based nano-composite materials, in particular to a preparation method of high-strength and tough aluminum-based nano-composite materials. Background technique [0002] In-situ internal particle-reinforced aluminum matrix composites have been widely used in aviation, aerospace, automobile, machinery and other industrial fields due to the advantages of high thermal stability of the generated particles, clean interface with the matrix, high bonding strength, and stable high-temperature performance. In particular, when the size of the endogenous particles is reduced to the nanometer level, the surface area of ​​the nanoparticles per unit volume increases sharply by hundreds of times, which promotes the high surface activity of the nano-reinforced particles, and numerous active interfaces lead to the formation of the particle-matrix interface. The strong interaction makes the interface bond more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/04
Inventor 赵玉涛陈存怯喜周陈刚
Owner JIANGSU UNIV
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