Journal of New Technology and Materials
Volume 10, Numéro 1, Pages 69-74
2020-06-22
Microstructural And Mechanical Behaviour Of Spray Formed Al-si-gr Composites Synthesised By Friction Stir Processing
Authors : Bajpai Abhijeet . Singh Baghel Dhruv . Singh Raj Kumar . Yadav Pradeep Kumar .
Abstract
In this study, Al-Si-Gr composites for cylinder liner application were synthesised using a spray forming technique, aiming at improving the wear resistance. Silicon (Si) and graphite (Gr) particles, which do not distribute uniformly in the aluminium matrix by conventional processes, are dispersed uniformly throughout the composite using spray forming. Al–6Si-5Gr, Al-12Si-5Gr, and Al–18Si-5Gr composites were used to make disc-shaped spray form castings, and then their microstructures were studied. In spray form castings, it was found that the Si and Gr particles were distributed homogeneously in the Al-matrix. Friction stir processing (FSP) was performed on spray formed Al-Si-Gr composites. In the present work, FSP was introduced to refine the microstructure of spray formed Al-Si-Gr composites. The microstructure of the stir zone (SZ) was observed to be highly refined compared to the spray forming material. FSP resulted in the elimination of casting defects, especially porosity and complete homogenisation. Other than this FSPed sample showed higher hardness compared to spray formed sample.
Keywords
Spray forming ; Friction stir processing ; Al-Si-Gr composite ; Microstructural refinement
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