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Fabrication and High Strain Rate Superplasticity of Nano Al2O3 Reinforced Aluminum Composites

Author: ZhaoRuiFeng
Tutor: GengLin
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Nano- Al2O3 particles 6061 Composites Vacuum hot pressing Superplasticity
CLC: TB333
Type: Master's thesis
Year: 2009
Downloads: 159
Quote: 0
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Abstract


Discontinuously reinforced aluminum matrix composites have high specific strength and stiffness, is a very promising high-strength lightweight structural materials. However, due to the discontinuous reinforced aluminum matrix composites lower ductility, making the plastic forming complex shaped components becomes more difficult. Therefore research discontinuously reinforced aluminum matrix composites for high-speed superplastic plastic components into complex shapes is very important. This article was prepared by powder metallurgy nano-Al2O3 particles is 5% and 10% Al2O3p/6061Al composite materials, and composites were hot extrusion and hot rolling deformation. Using scanning electron microscopy, transmission electron microscopy and tensile testing of nano Al2O3 particle content as well as hot extrusion and hot rolling deformation on Al2O3p/6061Al composite microstructure and properties were investigated. Hardness measurement method using the optimized Al2O3p/6061Al composite solution and aging heat treatment parameters. High temperature tensile test method using thermal extrusion and hot rolling deformation, nano Al2O3 content, deformation temperature and strain rate on Al2O3p/6061Al composite tensile superplasticity investigated. With 5% HF immersion and ultrasonic dispersion and mechanical stirring method of nano-Al2O3 particles were dispersed cleaning and pretreatment. Identified 6061Al nano Al2O3 matrix powder mixed with optimum process: ball to powder ratio of 10:1, the rotational speed of 100 rev / min, the milling time is 20 hours. The sintering temperature was 530 ℃ and dwell time of 1.0 hours under a vacuum hot press sintering, nano-Al2O3 particles were prepared at 5% and 10% of Al2O3p/6061Al composite material, respectively, at 530 ℃ and 500 ℃ temperature under hot extrusion of the composite material and hot extrusion system deformation. Microstructure analysis showed that the hot extrusion deformation and hot rolling deformation increases Al2O3p/6061Al composite nano Al2O3 uniformity; nano Al2O3 content of 5% of the Al2O3p/6061Al Al2O3 composite particle distribution uniformity nanodrugs Al2O3 particles content of 10% composite good. Tensile test results showed that: hot extrusion and hot rolling deformation of the deformation Al2O3p/6061Al composite tensile strength and tensile ductility have been improved; nano Al2O3 content of 5% of the composite materials exhibit relatively Al2O3p/6061Al good comprehensive tensile properties. Optimize the use of hardness testing methods Al2O3p/6061Al composite solid solution and aging treatment process parameters. Al2O3p/6061Al sintered composite materials, the best solution treatment temperature is 530 ℃, solution treatment time of 1.5-2.0 hours, aging processes: 160 ℃ aging for 5 hours. Hot-extruded and hot laminated composite materials, the best state Al2O3p/6061Al solution treatment temperature is 530 ℃, solution treatment time of 1.0 to 1.5 hours, aging processes: 160 ℃ aging for 4 hours. Content of nano Al2O3 particles as well as hot extrusion and hot rolling deformation on Al2O3p/6061Al composite tensile superplasticity. The results showed that: nano Al2O3 content of 5% composite nanodrugs Al2O3 particles content of 10% of the composite material has greater tensile superplasticity; hot extrusion and hot rolling tensile deformation of superplastic improved. At a temperature of 500-620 ℃ and strain rate of 0.01-1.0 s-1 under the conditions tested Al2O3p/6061Al tensile superplasticity. The results showed that: increase with strain rate, Al2O3p/6061Al maximum elongation of the composite material obtained by the temperature rise corresponding to the stretching deformation; at a temperature of 560 ℃ and strain rate of 1.0 s-1, the nano-Al2O3 particles was 5% thermal rolling state Al2O3p/6061Al composites obtained 262% of the maximum speed tensile superplasticity, then strain rate sensitivity factor of up to 0.35.

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