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The as Cast Microstructure and Mechanical Properties of 10wt%TiC Reinforced Al-12%Si Matrix Composite
Current Issue
Volume 2, 2014
Issue 4 (August)
Pages: 50-55   |   Vol. 2, No. 4, August 2014   |   Follow on         
Paper in PDF Downloads: 13   Since Aug. 28, 2015 Views: 831   Since Aug. 28, 2015
Authors
[1]
Belete Sirahbizu Yigezu, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, Uttrakhand- India.
[2]
P. K. Jha, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, Uttrakhand- India.
[3]
M. M. Mahapatra, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, Uttrakhand- India.
Abstract
In this study an attempt had been made to investigate the effect of in-situ synthesized 10 wt% TiC in the microstructure and mechanical properties of Al-12%Si matrix. The microstructures and tensile fracture characteristics of the representative composite samples were examined using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The investigation revealed that fairly uniform distribution of a mixture of sub micro size and flake/needle shape Titanium Carbide (TiC) particles with some voids in few areas. In addition, Al3Ti and Al4C3 intermetalic phases were observed. As compared to the matrix alloy processed in similar conditions, the 10wt% TiC reinforced composite exhibit a 66.7%, 64.6%, and 37.9% increase in 0.2% proof stress, ultimate tensile strength (UTS) and bulk hardness, respectively. On the other hand, the percentage elongation (%EL) and percentage porosity reduced by 24.1% and 37.2%, respectively. However, there is only a slight increase in elastic modulus (E), in values of 11.9%.The fractographic test analysis indicated that the fracture surfaces of both matrix and composite materials demonstrate a brittle fracture characteristics.
Keywords
Al-Si alloy, Interfacial Reactions, In-situ, Mechanical Properties, MMCs, TiC
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