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Pressure infiltration behaviour and properties of aluminium alloy - Oxide ceramic preform composites

Huchler, Bernd Arthur (2009)
Ph.D. thesis, University of Birmingham.

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In the pressure infiltration processing of Metal Matrix Composites (MMCs), molten metal is injected into a porous preform. This research investigated ways to optimize the processing and properties of MMCs with Al alloy matrices. A ceramic volume fraction of 0.30 to 0.40 was used to keep a preponderant metallic behaviour and the reactivity of MgO, TiO2, Al2O3-SiO2 and Al2O3-TiO2 preforms was compared to pure Al2O3. Two stages were found during infiltration: first, flow initiation characterised by the dynamic wetting angle θdyn and, second, the advancing flow in the preform capillaries. Reactions were detected in the MMC but did not significantly influence the θdyn. Unsaturated fluid flow was evaluated for the subsequent infiltration stage and good agreement was found between a numerical model and experimental data. The MMCs had improved properties compared to the pure alloy. Elastic moduli up to 148 GPa, bending strengths up to 456 MPa as well as reduced wear rate were found. The wear performance of extended ceramic ligaments, found in MMCs with spherical metal ligaments, exceeded all other materials. The improved understanding of the infiltration of preforms and the resulting MMC properties obtained in this research should lead to the development of tailorable composite materials.

URL of Published Version:

Type of Work:Ph.D. thesis.
Supervisor(s):Blackburn, Stuart and Harding, Richard
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:359
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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