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TECHNICAL PAPERS

Microwave Synthesis and Characterization of Magnesium Based Composites Containing Nanosized SiC and Hybrid (SiC+Al2O3) Reinforcements

[+] Author and Article Information
Sanjay Kumar Thakur

 Delphi Automotive Systems Singapore Pte Ltd., 501 Ang Mo Kio Industrial Park 1, Singapore 569621sanjay.kumar.thakur@delphi.com

K. Balasubramanian

 Nonferrous Materials Technology Development Centre, Kanchanbagh, Hyderabad 500058, Indiadirector@nftdc.res.in

Manoj Gupta1

Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576mpegm@nus.edu.sg

1

Corresponding author.

J. Eng. Mater. Technol 129(2), 194-199 (Jun 17, 2006) (6 pages) doi:10.1115/1.2400279 History: Received January 24, 2006; Revised June 17, 2006

In the present study, monolithic magnesium, nanosized SiC reinforced magnesium and nanosized hybrid (SiC+Al2O3) reinforced magnesium materials have been synthesized by using powder metallurgy route involving microwave sintering followed by hot extrusion. The results show that the monolithic and the reinforced magnesium materials have minimal porosity and the reinforced magnesium materials have fairly well distributed nanosized SiC and SiC+Al2O3 particles in the matrix. The thermo-mechanical property measured in terms of coefficient of thermal expansion of the reinforced magnesium shows dimensionally more stable magnesium as compared to monolithic magnesium. The hardness 0.2% YS and UTS were found to improve significantly after addition of nanosized SiC and nanosized hybrid SiC+Al2O3 particles to the magnesium, However, ductility measured in terms of failure strain was found to be marginally reduced. Fractography results showed the presence of brittle failure mode with cleavage steps on the fractured surface of the magnesium matrix.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Schematic diagram showing the experimental setup used in the present study

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Figure 2

Representative FESEM micrographs showing the distribution of: (a) SiC in Mg∕1%SiC; (b) SiC and Al2O3 in Mg∕0.5%SiC+0.5%Al2O3; and (c) SiC and Al2O3 in Mg∕0.3%SiC+0.7%Al2O3 composites

Grahic Jump Location
Figure 3

Representative SEM micrographs showing the fractured surface of: (a) pure Mg; (b) Mg∕1%SiC composite; (c) Mg∕0.5%SiC+0.5%Al2O3 composite; and (d) Mg∕0.3%SiC+0.7%Al2O3 composites

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