Papers by Author: Qiu Bao Ouyang

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Authors: Qiu Bao Ouyang, Wen Long Wang, Di Zhang, Guo Ding Zhang
Abstract: Discontinuously reinforced aluminum (DRA) composites are attractive for a large range of engineering applications because of its excellent wear-resistance, high thermal conductivity and light weight etc. In this paper, DRA composites were designed and fabricated especially for automotive application, and their properties were measured. Brake discs of DRA composites were manufactured and their braking performances were investigated, including brake velocity, brake pressure, brake torque, brake deceleration, brake time and surface temperature etc. The test results show DRA composites exhibit an excellent braking performance.
Authors: Qiu Bao Ouyang, H.L. Gu, W.L. Wang, Di Zhang, Guo Ding Zhang
Abstract: Friction and wear properties of aluminum matrix composites are studied, including brake speed, brake pressure, and surface temperature etc. A conclusion can be drawn that SiC particle reinforced aluminum matrix composites are of stable friction coefficient, high thermal conductivity, and excellent wear-resistance. Hubs of motorcycle with brake rings of Al/SiC composites were manufactured and exhibited an excellent braking performance.
Authors: Qiu Bao Ouyang, Rui Xiang Li, Wen Long Wang, Guo Ding Zhang, Di Zhang
Abstract: Compared to the conventional constructive materials, SiC particle reinforced aluminum matrix composites have lighter weight and higher specific modulus, and are applied in the structure framework of solar battery array for space station. According to the requests of the material properties for this framework, aluminum matrix composites are specially designed and manufactured, and then deformed into components of different shapes and sizes for various uses. The composite components were of compact structure and excellent mechanical properties, and had passed all the application tests for the framework. The application of aluminum matrix composites achieves a good result that not only the framework weight was greatly reduced but also the comprehensive properties of the framework were improved greatly. Aluminum matrix composites exhibit a great potential for further application into aerospace.
Authors: Sam R. Humphries, Richard Wuhrer, N.G. Booth, Wing Yiu Yeung, Qiu Bao Ouyang, J. Qin, D. Zhang
Abstract: An enhanced nucleation heat treatment process was employed to refine the grain structure of 7075Al/ 7wt.% SiCp metal matrix composite material. The grain structure of the metal matrix composite was investigated. The resulting microstructures were compared. It was found that a fine grained microstructure developed after the rapid heat treatment process. An increase in hardness was achieved, with hardness increasing from 129 HV in the cold extruded state to 137 – 153 HV after the heat treatment process.
Authors: Jonathan Mak, Richard Wuhrer, Sam R. Humphries, Norman Booth, Greg Heness, Wing Yiu Yeung, Tao Wei, Ji Ning Qin, Qiu Bao Ouyang, Di Zhang
Abstract: There have been growing demands of high performance metal matrix composites in advanced engineering applications in virtue of their high specific strengths. This paper is to report an assessment of the mechanical properties of LC4/SiCp metal matrix composites using an innovative testing technique, small punch test. The composite materials of this study were produced by stir casting method with particulate reinforcements of 7wt.% and 14wt.% of SiC respectively. Small punch testing was performed on the LC4 base alloy and the two composites materials. The small punch test is a relatively new mechanical testing technique capable of utilizing small disk-shaped samples to determine the mechanical properties of the test materials. In this study, the equivalent fracture strain, εqf of the LC4/SiCp MMCs was characterised and compared with the base alloy. The fracture mechanism of the test samples was examined using scanning electron microscopy.
Authors: Jun Feng You, Du O Zhang, Qiu Bao Ouyang, Jian He Su
Abstract: This work studied the possibility of the application for Metal Matrix Composites (MMCs) in extendible exit cone nozzles (EECNs), through analyzing the stress distribution on the solid rocket motor’s EECNs. The result shows that the MMCs can be used on the EECNs. With replacing the traditional steel by light MMCs to serve as the key supporting components, the strength and stiffness can satisfying the application request. The mass of the components are drastically decreased. This technique has promising applications.
Authors: Qiu Bao Ouyang, Wei Min Zhou, Guo Ding Zhang, Di Zhang
Abstract: The objective of the present paper is to study the wetting phenomenon and improving methods of Al/SiC interfaces. The work of adhesion and contact angle of this system was calculated theoretically from the physicochemical model. The effects of alloy elements such as Mg and the processing temperature on wettability were also investigated theoretically. Based on the theoretical calculation results, some effective methods to improve the wettability were presented.
Authors: Qiu Bao Ouyang, Wei Min Zhou, Guo Ding Zhang, Di Zhang
Abstract: The objective of the present paper is to study the wetting phenomenon of metal-ceramic interfaces. Two composite systems, i.e., SiCox/Al+xMg and Al2O3/Al+xMg were selected for calculation. The effects of alloy elements such as Mg and the processing temperature on wettability were investigated theoretically. The calculated wetting contact angles from the physicochemical model are approximately in agreement with experimental values.
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