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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 646 pages |
| ISBN: | 978-0-9879917-6-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Microstructure And Mechanical Properties Of Al/SiCp/MgAl2O4 Composites Processed From SiCp And Rice-hull Ash Via Non-assisted Infiltration
MARTIN PECH-CANUL1; Rodrigo Escalera-Lozano2; Maximo Pech-Canul3; Miguel Montoya-Davila4;1CENTRO DE INVESTIGACION Y DE ESTUDIOS AVANZADOS DE, Saltillo, Mexico; 22UNIVERSIDAD DEL ISTMO, CAMPUS TEHUANTEPEC, Tehuantepec, Oax., , Mexico; 3CINVESTAV, Mérida, Mexico; 44UNIVERSIDAD AUTóNOMA DE ZACATECAS, Zacatecas, Mexico;
Type of Paper: Regular
Id Paper: 233
Topic: 9
Abstract:
The effect of two major elements – Si and Mg –, on the wettability and the resulting microstructure of Al/SiC composites has been discussed extensively in previous literature. Of prime importance is the beneficial role of silicon in enhancing wetting and preventing the attack of SiC by liquid aluminum. The latter effect, however, has been obtained by the use of SiO2 instead of elemental Si. Intense research work has shown recently that rice-hull ash (RHA) can be used as a means for supplying silicon to the system and that the MgAl2O4 phase is produced with Mg containing aluminum alloys. Nonetheless, variations in the content of Si and Mg in the Al alloy, can lead to alteration of the microstructure, and consequently, to variations in physical and mechanical properties. In this work, a study on the effect of Si and Mg content on the microstructure and mechanical properties of Al/SiCp composites prepared with RHA has been carried out. SiCp/RHA preforms were infiltrated with Al alloys with varying amounts of Si and Mg. The results show that although density is not significantly affected, the hardness of the composites increases while the magnitude of the elastic modulus (E) decreases with augment in the Si/Mg molar ratio. This result is ascribed to the residual porosity in the composites.