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Title: Processing, microstructure, and properties of Mg - SiC composites synthesised using fluxless casting process
Authors: Lim, S.C.V.
Gupta, M. 
Lu, L. 
Issue Date: 2001
Source: Lim, S.C.V.,Gupta, M.,Lu, L. (2001). Processing, microstructure, and properties of Mg - SiC composites synthesised using fluxless casting process. Materials Science and Technology 17 (7) : 823-832. ScholarBank@NUS Repository.
Abstract: In the present study, elemental magnesium and magnesium - silicon carbide composites were synthesised using the methodology of fluxless casting followed by hot extrusion. Microstructural characterisation studies revealed low porosity and a completely recrystallised matrix in every material. The average size of the recrystallised grains was found to decrease with an increasing presence of SiC particulates. For the reinforced magnesium, fairly uniform distribution of SiC particulates and good SiC - Mg interfacial integrity was realised. The results of X-ray diffraction studies indicated the absence of oxide phases and no evidence of interfacial reaction products except in the case of Mg - 26.0 wt-%SiC sample. Results of physical and mechanical properties characterisation revealed that an increase in the amount of SiC particulates incorporated leads to an increase in macrohardness and elastic modulus, which does not affect the 0.2% yield strength and reduces the ultimate tensile strength, ductility, and coefficient of thermal expansion. The weight percentage of SiC particulates when plotted against hardness and 0.2% yield strength revealed a linear correlationship. An attempt is made to investigate the effect of increasing amount of SiC particulates on the microstructural features, and physical and mechanical properties of the magnesium matrix.
Source Title: Materials Science and Technology
ISSN: 02670836
Appears in Collections:Staff Publications

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