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Investigation on the Microstructure and Properties of Carbon Nanotubes Reinforced Aluminum Matrix Composites

Author: ZhaoXia
Tutor: KeLiMing
School: Nanchang University of Aeronautics and
Course: Materials Processing Engineering
Keywords: Friction stir processing Carbon nanotubes Pure aluminum matrix composites Wear performance Tensile strength
CLC: TB333
Type: Master's thesis
Year: 2010
Downloads: 219
Quote: 2
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Abstract


The carbon nanotubes reinforced aluminum matrix composites with low density, excellent resistance to oxidation and abrasion characteristics. Prepared: stir casting method, hot pressing sintering method, powder metallurgy and so on, but each has its limitations, therefore a need for a new approach to more effective preparation of composite materials. Friction stir processing (FSP) in friction stir welding (FSW) developed a material based on modified composites technology with simple manufacturing processes and equipment, and the relatively low cost. In this paper, friction stir processing carbon nanotubes prepared reinforced pure aluminum matrix composites, the organization and performance of the composite, and rotating friction extrusion preliminary study prepared composite. The results showed that: when only one stirring rod composite material was prepared, the volume percentage of carbon nanotubes was 1.6%, it is easy to obtain good and uniform molding composite region, when the carbon nanotube content is higher, the friction stir zone boundary and the shaft shoulder deformation zone prone to segregation of the carbon nanotubes, it is difficult to achieve macroscopic uniformity distribution. First stirred with small diameter rods and then a large-diameter stirring rod preparing a composite material, it is easy to obtain a molding good composite region, and the segregation phenomenon of the friction stir zone boundary can be improved. Friction stir zone boundary grains significant plastic deformation, is distorted elongated; similar to the central area of ??the grain size of the deformation of the shaft shoulder area and friction stir small grains compared. The TEM observation results showed that the carbon nanotubes in the central area of ??the friction stir evenly distributed and embedded into the aluminum matrix, and good binding and matrix. The hardness, tensile strength and abrasion resistance of the composite material is increased with increasing the content of the carbon nanotube. When a stirring rod composite material was prepared using only 7%, the volume percentage of the carbon nanotubes, the average microhardness of the friction stir zone 60.8HV, tensile strength can be achieved 201.45 MPa; the volume percentage of the carbon nanotubes is 5.5 %, the wear resistance of the composite material are significantly enhanced. First stirred with small diameter rods and then a large diameter of the stirring rod of preparing a composite material, the volume percentage of the carbon nanotubes is 5%, the average microhardness of the friction zone is stirred 53.8HV, tensile strength can be reached 171.06 MPa, abrasion There are significantly improved. Substrate and composite main wear mechanism is abrasive wear. Nanotube volume percentage of 1.3% -5%, compared with the substrate, there is a certain increase in the tensile strength of the material, but the ductility is reduced; the nanotube volume percentage of 5.5% -7%, \disappears, less plastic, brittle, brittle fracture characteristics of composite materials in the macro, micro was ductile fracture characteristics. Extrusion rotary friction the device preparation of carbon nanotubes reinforced aluminum matrix composites Preliminary studies indicate that the rotational friction extrusion method can be prepared a massive composite forming better no the carbon nanotubes segregation and defect, hardness distribution more uniform.

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