Evaluation of mechanical and tribological properties of silicon nitride and titanium dioxide reinforced functionally graded aluminium metal matrix composites
4
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The functionally graded materials are innovative materials that possess good properties than traditional composite materials. However, this material yields at lower stress and undergoes slightly higher wear than traditional materials. Hence, the primarygoal of this work is to enhance the mechanical and tribological properties of functionally graded aluminium metal matrixcomposites (FGAMMC) by silicon nitride and titanium dioxide nano particle reinforcement. A hollow cylindrical specimenwith dimensions of 150 150 20 mm with three combinations Al 7075+Si3N4, Al 7075+TiO2 and Al 7075+Si3N4+TiO2 wasfabricated via liquid metallurgy followed by centrifugal casting. The fabricated novel FGAMMC materials are investigatedbased on their mechanical and tribological properties and compared with base material Al 7075. The investigation resultreveals that, the concentration of Si3N4 and TiO2 is higher in the outer surface than in the inner surface, ensuring a gradeddistribution. The hardness of Al 7075+Si3N4+TiO2 is increased by 36.94% in the outer surface and 21.86% in the middlesurface compared with Al 7075. The ultimate tensile strength of Al 7075+Si3N4+TiO2 is recorded as 42.23% higher than the Al7075. The Al 7075+Si3N4 specimen produced less wear rate compared with the Al 7075, Al 7075+TiO2 and Al 7075+Si3N4+TiO2specimens.
Abstract
The functionally graded materials are innovative materials that possess good properties than traditional composite materials. However, this material yields at lower stress and undergoes slightly higher wear than traditional materials. Hence, the primarygoal of this work is to enhance the mechanical and tribological properties of functionally graded aluminium metal matrixcomposites (FGAMMC) by silicon nitride and titanium dioxide nano particle reinforcement. A hollow cylindrical specimenwith dimensions of 150 150 20 mm with three combinations Al 7075+Si3N4, Al 7075+TiO2 and Al 7075+Si3N4+TiO2 wasfabricated via liquid metallurgy followed by centrifugal casting. The fabricated novel FGAMMC materials are investigatedbased on their mechanical and tribological properties and compared with base material Al 7075. The investigation resultreveals that, the concentration of Si3N4 and TiO2 is higher in the outer surface than in the inner surface, ensuring a gradeddistribution. The hardness of Al 7075+Si3N4+TiO2 is increased by 36.94% in the outer surface and 21.86% in the middlesurface compared with Al 7075. The ultimate tensile strength of Al 7075+Si3N4+TiO2 is recorded as 42.23% higher than the Al7075. The Al 7075+Si3N4 specimen produced less wear rate compared with the Al 7075, Al 7075+TiO2 and Al 7075+Si3N4+TiO2specimens.