Synthesis and characterization of zirconium dioxide particulate reinforced aluminium alloy metal matrix composite

Aluminium alloys based metal matrix composites are evolving in industrial applications where high strength to weight ratio is required. In this research, 6061 grade aluminium alloy matrix with zirconium dioxide, particulate reinforced composite is fabricated. Composite material which reinforced with zirconium dioxide is fabricated with various weight percentages like 2%, 4%, 6%, 8% and 10% of reinforcement respectively, using stir casting process. Metallurgical and mechanical properties of the composite are analysed. Scanning electron micrograph showing that the particulates are dispersed uniformly into the matrix alloy. Particulate agglomeration is significantly reduced in the fabricated material. Addition of ceramic particulates improves the hardness of material by restricting dislocation of alloy matrix. Tensile test results show that the addition of zirconium dioxide, particulate increases its strength up to 6% addition of ZrO2. Futher additon of zirconium dioxide, decrease its stength. The ultimate strength (UTS) of the AA6061/ 6% ZrO2 composite were 169 MPa which is 24.26% higher than that of AA6061 alloy. The Microhardness of the AA6061 / ZrO2 is found to be 32.73% higher than that of AA6061 alloy. Dry sliding wear behavior of AA6061/0-10 wt% ZrO2 composite is investigated at room temperature by using a pin-on-disc wear testing apparatus.The possible sliding wear mechanisms were examined with the help of SEM micrographs of worn surface. When the wt% of ZrO2 reinforcement in the matrix is maximized, wear mechanism of composite is found to be abrasive.