Wear of Al/Al_3Zr functionally graded materials fabricated by centrifugal solid-particle method

摘要

In this study, Al-5mass%Zr functionally graded materials (FGMs) were fabricated by the centrifugal solid-particle method (CSPM) under applied centrifugal force of 30, 60 and 120G (units of gravity). Microstructural observation along the centrifugal force direction showed that Al_3Zr platelet particles are almost oriented normal to the applied centrifugal force direction. Volume fraction of Al_3Zr particles increases close to the ring surface. Moreover, this distribution range of Al_3Zr particles becomes broader with decreasing the applied centrifugal force. The wear anisotropy of the fabricated Al/Al_3Zr FGMs was strongly influenced by the platelet particles orientation at the test position. Investigating both of the worn surface morphology and the sub-worn surface layer showed that plastic deformation induced wear is the dominant mechanism during the wear process of Al/Al_3Zr FGMs samples. Therefore, some of the tested samples were severely deformed and an Al_3Zr particles-free layer containing Al-Zr supersaturated solid solution was observed very near to the worn surface during the wear test.