An Experimental Investigation on mechanical and wear properties of Al7075/SiCp composites: effect of SiC content and particle size

[+] Author and Article Information
Thella Babu Rao

Associate Professor, Department of Mechanical Engineering, K L University, Green Fields, Vaddeswaram, Guntur Dist., Andhra Pradesh - 522 502, INDIA

1Corresponding author.

ASME doi:10.1115/1.4037845 History: Received May 26, 2017; Revised August 16, 2017


One of the major advantages of metal matrix composites is that their tailorable properties meet the specific requirements of a particular application. This paper deals with the experimental investigations done on the effects of the reinforcement particulate size and content on the Al7075/SiC composite. The composites were manufactured using stir casting technique. The effect of SiC particle size (25, 50 and 75µm) and particulate content (5, 10 and 15wt.%) on the microstructural, mechanical properties and wear rate of the composites was studied and the results were analyzed for varied conditions of reinforcement. SEM examinations were used to assess the dispersion of SiC particles reinforced into the matrix alloy and was found with reasonably uniform with minimal particle agglomerations and with good interfacial bonding between the particles and matrix material. XRD analysis confirmed the presence of Al and SiC with the composite. The results of mechanical tests showed that the increasing SiC particle size and content considerably enhanced the ultimate tensile strength and hardness of the composites while the ductility at this condition was decreased. The highest UTS of 310MPa and hardness of 126 BHN were observed for the composites containing 15wt%. SiC at 75µm. Lower the wear resistance of the reference alloy while it was enhanced up to 40% with the composites. The wear resistance was increased up 1200m of sliding distance for all the composites, whereas for the composite containing 75µm SiC particles it was extended up to 1800m.

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