Please use this identifier to cite or link to this item: http://hdl.handle.net/10266/5162
Title: Fabrication and Characterization of Aluminum Metal Matrix Composites Using Rare Earth Metal as an Additive
Authors: Aggarwal, Divyanshu
Supervisor: Kumar, Vinod
Joshi, R.S.
Keywords: Composites;Rare earth oxides;Ceramics
Issue Date: 3-Aug-2018
Abstract: In this technological era, the demand of advanced engineering applications has been increased on a rapid rate. Need of the advance materials that can provide better mechanical properties, amenability to conventional processing technique and possibility in reducing production cost are the major demands of today’s industrial world. Aluminum hybrid composites are the new generation metal matrix composites that have the potential to satisfy these demands. The present study deals with the fabrication of aluminum metal matrix composites reinforced with Al_2 O_3 + SiC and rare earth metal (CeO_2) as an additive. Improvement in the mechanical as well as tribological properties was examined. The mechanical properties such as hardness, tensile strength, percentage elongation along with tribological properties such as wear rate were examined. The microstructure analysis was done with the help of SEM, XRD and EDS techniques. The weight percentage of reinforcements used was a mixture of 5%, 10%, 15% (Al_2 O_3 + SiC) and the rare earth metal used was 0.5, 1.5 and 2.5 weight %. The specimens selected for wear test were those having highest hardness values in both the cases i.e. non-rare as well as rare earth composites against base matrix alloy. The wear testing was done on a pin-on-disc tribometer using 10×12 mm composite pins against EN31 steel disc. Wear rate was examined against different sliding velocities i.e. 0.5, 1, 2 m/sec at different normal loads i.e. 10, 20, 30N. Progressive wear rate was also calculated at different sliding distances i.e. 500, 1000, 1500 and 2000 m. Microstructure of the wear specimens after the test was done with the help of SEM technique. It was observed that as the wear rate decreased with increase in value of sliding velocity and decrease in value of loads. The progressive wear shows a steady wear rate as the value of sliding distance increased. SEM images of the wear specimens shows the improvement in the surface texture by reduction in size of cracks and various other defects by addition of rare earth metal. The hardness, tensile strength and percentage elongation of the composites also increased with the increase in % reinforcements but as compared to non-rare earth composites, the composites having rare earth metal as an additive shows better enhancement in properties as compared to non-rare earth composites whether mechanical or tribological. The microstructure analysis shows better refinement of the composite after addition of rare earth. XRD and EDS analysis shows successful incorporation of hybrid composite particles.
Description: Master of Engineering- Production
URI: http://hdl.handle.net/10266/5162
Appears in Collections:Masters Theses@MED

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