A. Fattah-Alhosseini, M. Ranjbaran, S. Vajdi Vahid,
Volume 12, Issue 2 (6-2015)
Abstract
In this study, corrosion behaviour of A356-10 vol.% SiC composites casted by gravity and squeeze casting
is evaluated. For this purpose, prepared samples were immersed in HCl solution for 1h at open circuit potential. Tafel
polarization and electrochemical impedance spectroscopy (EIS) were carried out to study the corrosion resistance of
composites. The Tafel polarization and EIS studies of the corrosion behaviour of the A356-10 vol.% SiC composites
showed that the corrosion resistance of the composite casted by squeeze casting was higher than that of the composites
casted by gravity in selected corrosion media. Also, the Tafel polarization and EIS studies revealed that the corrosion
current densities of both composites increase with the increase in the concentration of HCl. The micrographs of
scanning electron microscope (SEM) clearly showed the squeeze casting composite exhibits a good dispersion/matrix
interface compared to that of the composites produced by gravity casting
M. Senthil Kumar , R. V. Managalaraja, K. Senthil Kumar, L. Natrayan,
Volume 16, Issue 2 (6-2019)
Abstract
The present requirement of automobile industry is seeking lightweight material that satisfices the technical and technological requirements with better mechanical and tribological characteristics. Aluminium matrix composite ( AMC ) materials meet the requirements of the modern demands. AMCs are used in automotive applications as engine cylinders, pistons, disc and drum brakes. This paper investigates the effect of particle size and wt% of Al2O3/SiC reinforcement on mechanical and tribological properties of hybrid metal matrix composites (HMMCs). AA2024 aluminium alloy is reinforced with Al2O3/SiC different particle sizes (10, 20 and 40 µm) and weight fractions (upto 10 wt %) were fabricated by using squeeze casting technique. HMMCs were characterized for its properties such asX-ray diffraction (XRD), density, scanning electron microscope ( SEM ), hardness, tensile strength, wear and coefficient of friction. AA2024/5wt%Al2O3/5wt%SiC with 10 μm reinforced particle size showed maximum hardness and tensile strength 156.4 HV and 531.43 MPa and decrease in wear rate was observed from from 0.00307 to 0.00221 for 10N. Hybrid composites showed improved mechanical and wear resistance suitable for engine cylinder liner applications.
