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Method for improving strength and plasticity of whisker reinforced pure aluminium-based composite material

A composite material and whisker technology, which is applied in the field of improving the strength and plasticity of pure aluminum-based composite materials, can solve the problems of low elongation of pure aluminum-based composite materials, and achieve the effects of increased elongation, yield strength and tensile strength

Inactive Publication Date: 2011-07-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low elongation of the whisker reinforced pure aluminum matrix composite material; provide a method for improving the strength and plasticity of the whisker reinforced pure aluminum matrix composite material

Method used

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  • Method for improving strength and plasticity of whisker reinforced pure aluminium-based composite material
  • Method for improving strength and plasticity of whisker reinforced pure aluminium-based composite material
  • Method for improving strength and plasticity of whisker reinforced pure aluminium-based composite material

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specific Embodiment approach 1

[0009] Specific Embodiment 1: The method for improving the strength and plasticity of whisker-reinforced pure aluminum matrix composites in this embodiment is carried out through the following steps: 1. According to the volume fraction of whiskers and carbon nanotubes in the prefabricated block and the height of the prefabricated block , according to m=0.25×10 -2 ×π×D 2 ×H×V f ×ρWeigh aluminum borate whiskers with a diameter of 0.1-1μm and carbon nanotubes with a diameter of 10-30nm, where m is the mass of the whiskers or carbon nanotubes to be weighed, and the unit of m is g, D Is the diameter of the prefabricated block, the unit of D: cm, H is the height of the prefabricated block, the unit of H: cm, V f is the volume percentage of whiskers or carbon nanotubes in the prefabricated block, ρ is the density of whiskers or carbon nanotubes, and the unit of ρ is g / cm 3 , the whiskers are silicon carbide whiskers or aluminum borate whiskers; 2. Purify the carbon nanotubes weigh...

specific Embodiment approach 2

[0010] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume fraction of carbon nanotubes in the prefabricated block described in step 1 is 0.2-0.6%, and the volume fraction of whiskers in the prefabricated block is 18-25%. %. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the volume fraction of carbon nanotubes in the prefabricated block described in step 1 is 0.3-0.5%, and the volume fraction of whiskers in the prefabricated block is 20-23%. %. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention relates to a method for improving the strength and the plasticity of a whisker reinforced pure aluminium-based composite material, which relates to a method for improving the strength and the plasticity of a reinforced pure aluminium-based composite material. The invention solves the problem of low elongation rate of the whisker reinforced pure aluminium-based composite material. The method comprises the following steps of: weighing aluminium borate whiskers and carbon nanotubes, purifying the carbon nanotubes to prepare a carbon nanotube suspension, then manufacturing a precastblock, drying, then sintering, casting pure aluminium, secondarily pressurizing and then cooling along with a furnace. Al / ABOw and Al / MWNTs interfaces in a reinforced whisker and carbon nanotube simultaneously reinforced composite material prepared by the method are straight, no interface reaction product is found, and the preparation process has no remarkable damage to the whiskers or the carbonnanotubes. The elongation rate of the composite material prepared by using the method can reach more than 3.69 percent and be markedly improved than an aluminium borate whisker reinforced pure aluminium composite material, and the elastic modulus, the yield strength and the tensile strength are further improved.

Description

technical field [0001] The invention relates to a method for improving the strength and plasticity of pure aluminum-based composite materials. Background technique [0002] Compared with aluminum, whiskers (silicon carbide whiskers, aluminum borate whiskers, etc.) reinforced aluminum matrix composites have high specific strength, specific stiffness, wear resistance, low thermal expansion coefficient, and are used in aviation, aerospace, electronics and Industries such as machinery have application potential. However, after whiskers are added to aluminum, the plasticity and toughness of aluminum are reduced, which easily leads to brittle fracture. Taking aluminum borate whiskers reinforced pure aluminum matrix composites as an example, since the overlapping aluminum borate whiskers split the continuous matrix aluminum alloy, and the interface bonding strength between the whiskers and the matrix is ​​low, under force Cracks first initiate at the whisker overlap and the whisk...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/06C22C101/04C22C101/10
Inventor 张学习耿林王德尊
Owner HARBIN INST OF TECH
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