Mechanical and dry sliding wear behaviour of B4C and rice husk ash reinfroced Al 7075 alloy hybrid composite for armors application by using taguchi techniques

Abstract

These research works investigate, the mechanical and dry sliding behaviour of AA7075-B4C-rice husk ash (RHA) hybrid alloy composite. The specimens of AA7075 with 0, 2, 4, 6, 8 wt% of B4C mixed with 0, 2, 4, 6 and 8 wt% rice husk ash (RHA) are prepared using high vacuum casting machining to study the dry sliding wear behaviour at room temperature. The surface study is used to characterize the fabricated hybrid AA7075 composites. The mechanical behaviour, hardness, flexural tests are conducted using respective ASTM standards. The maximum hardness of 128 HV is obtained for AA7075-8 wt% B4C – 8 wt% rice husk ash (RHA) hybrid composite. The maximum tensile, compressive and flexural strength obtained to be 270 MPa, 570 MPa and 480 MPa respectively, at 8 wt% B4C – 8 wt% of RHA. RHA and B4C particles improved the wear resistance of hybrid composites and decreased the damage on the worn surface. The obtained results are also optimized and observed that addition of 8 wt% B4C – 8 wt% of RHA have reduced wear rate of composite greatly even with increasing sliding velocity and the applied load. Thus, the wear resistance of composite improves at 8 wt% B4C – 8 wt% of RHA.