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Preparation of particle- and fiber-reinforced Al-based alloy composites by atomic packing theory and low-pressure compression method

A technology of base alloys and particles is applied in the field of preparation of metal matrix composite materials, which can solve the problems of difficult to disperse metal matrix, deterioration of performance of metal matrix composite materials, and easy agglomeration of reinforced particles.

Active Publication Date: 2019-11-29
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, powder metallurgy is only suitable for particle reinforced composites
Reinforcing particles are prone to agglomeration, and its severe agglomeration and non-wetting properties with metal make it difficult to disperse into the metal matrix
The places where the clusters occur will become defects and degrade the performance of the metal matrix composite as a whole

Method used

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  • Preparation of particle- and fiber-reinforced Al-based alloy composites by atomic packing theory and low-pressure compression method
  • Preparation of particle- and fiber-reinforced Al-based alloy composites by atomic packing theory and low-pressure compression method
  • Preparation of particle- and fiber-reinforced Al-based alloy composites by atomic packing theory and low-pressure compression method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] S1. Construct the theoretical model of atomic packing, use micron-sized strengthening particles and Al particles of the same size to mix at a ratio of 1:1, and regard each Al particle and micron-sized strengthening particles as an atom, and the model for simulating atomic packing at this ratio is Ideal state, which is a controllable process. Al particles and micron-sized strengthening particles are mixed by ball milling to achieve uniform distribution. The mixed powder is regarded as a simple cubic unit cell; according to the calculation method of simple cubic packing space occupancy, it can be known that :

[0029]

[0030] S2. It can be seen from step S1 that the atomic occupancy rate is 52%, and the remaining porosity=100%-atom occupancy rate, that is, the porosity is 48%, and the porosity is also the amount of fiber added;

[0031] S3. According to step S1, the mixing ratio of micron-sized reinforcing particles and Al particles is 1:1, and the addition ratio of f...

Embodiment 2-6

[0037] The difference between this example and Example 1 is that the addition amounts of fibers, reinforcing particles, and Al particles are different, and the specific addition ratios are shown in Table 1.

[0038] Table 1 Example 1-6 Addition ratio of fibers and reinforcing particles

[0039]

[0040]

[0041] In Examples 1-4, when the fiber addition amount is a fixed value of 7.5vol.%, the addition amount of micron-sized reinforcing particles is changed, and the mixing ratio of micron-sized reinforcing particles and Al particles is kept at 1:1. Prepare MMC sample according to the method described in embodiment 1 and carry out microstructure observation, as image 3As shown, with the decrease of f / p, the interval of clusters gradually increases.

[0042] Examples 4-6 are when the total amount of fibers and micron-sized reinforcing particles is a fixed value of 20vol.%, and the mixing ratio of micron-sized reinforcing particles and Al particles is kept at 1:1. Increas...

Embodiment 7

[0044] S1. Construct the theoretical model of atomic packing, mix nano-scale strengthening particles and Al particles of the same size at a ratio of 1:3, and regard each Al particle and nano-scale strengthening particles as an atom, and the model for simulating atomic packing at this ratio is Ideal state, which is a controllable process. Al particles and nano-scale strengthening particles are mixed by ball milling to achieve uniform distribution. The mixed powder is regarded as a face-centered cubic crystal; according to the calculation method of face-centered cubic packing space occupancy It can be seen that:

[0045]

[0046] S2. It can be seen from step S1 that the atomic occupancy rate is 74%, and the remaining porosity=100%-atom occupancy rate, that is, the porosity is 26%, and the porosity is also the amount of fiber added;

[0047] S3. According to step S1, the mixing ratio of nano-scale reinforcing particles and Al particles is 1:3, and the addition ratio of fibers ...

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Abstract

The invention relates to the preparation of a metal matrix composite material, in particular to a method for preparing a particle and fiber reinforced Al-based alloy composite material by an atom packing theory and a low pressure pressurizing method. The atom packing theory is adopted to establish a calculation method, the problem of clustering of particles during strengthening of the particle-fiber hybrid reinforced composite material is solved, so that the fiber can effectively form the three-dimensional distribution, and the particle slippage can be protected. The optimal adding ratio of the fiber and the micron-sized reinforced particles is definitely identified, the problem of no way to start after the fiber and the particles are mixed is solved, and the material can be used in the multi-dimensional space.

Description

technical field [0001] The invention relates to the preparation of metal matrix composite materials. Specifically, the mixing of ceramic fibers and particles is designed and optimized through atomic stacking theory, and the ratio of ceramic fibers and particles is added through crystal structure analysis to improve the uniform distribution of strengthening particles in the metal matrix alloy. Background technique [0002] In recent years, light metal materials have been widely used in the fields of electronics, aviation, and motor vehicles. Recent studies have shown that the graphene-reinforced aluminum matrix composite material prepared by the flake powder metallurgy method based on the idea of ​​bionic lamination of shells has nearly doubled the elongation of the composite material with uniform and random arrangement of carbon nanotubes, and the strength has also increased. It can be seen that the arrangement of strengthening materials in the matrix alloy plays a key role ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C49/06C22C47/06C22C47/08
CPCC22C47/06C22C47/08C22C49/06
Inventor 王通伊喆王国忠孙晖
Owner DALIAN UNIV
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