Production and characterization of alumina fiber reinforced squeeze cast aluminum alloy matrix composites

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2008

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Keleş, Özgür

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The aim of the present study was to investigate the effects of different levels of Saffil alumina fiber addition, magnesium content in aluminum alloy matrix and casting temperature on the mechanical behavior, microstructure and physical properties of short fiber reinforced aluminum matrix composites. The main alloying element silicon was kept constant at 10 wt%. Magnesium contents were selected as 0.3 wt% and 1 wt%. Saffil alumina fiber preforms varied from 10 to 30 vol%. The casting temperatures were fixed at 750 °C and 800 °C. Micro porosity was present at the fiber-fiber interactions. Closed porosity of the composites increased when fiber vol% increased, however, variation in casting temperature and magnesium content in matrix did not have influence on porosity. Hardness of the composites was enhanced with increasing fiber vol%, magnesium content in matrix and decreasing casting temperature. Alignment of fibers within the composite had an influence on hardness; when fibers were aligned perpendicular to the surface, composites exhibited higher hardness. The highest hardness values obtained from surfaces parallel and vertical to fiber orientation were 155.6 Brinell hardness and 180.2 Brinell hardness for AlSi10Mg1 matrix 30 vol% alumina fiber reinforced composite cast at 800 °C and at 750 °C, respectively. 30 vol% Saffil alumina fiber reinforced AlSi10Mg0.3 matrix composite cast at 750 °C showed the highest flexural strength which is 548 MPa. Critical fiber content was found as 20 vol% for all composites.

Subject Keywords

Metallurgical analysis.

URI

http://etd.lib.metu.edu.tr/upload/12609726/index.pdf
https://hdl.handle.net/11511/17711

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ö. Keleş, “Production and characterization of alumina fiber reinforced squeeze cast aluminum alloy matrix composites,” M.S. - Master of Science, Middle East Technical University, 2008.