CHARACTERIZATION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FSP PROCESSED AL-18SI-0.9CU-1.15NI ALLOYS
ASBTRACT Al-Si alloys produced via casting method consist of cast porosity, coarse eutectic structure, segregation of the large primary Si, and coarse intermetallic particles. The distribution of these particles creates difference in properties along the Al-Si system. During loading it creates different stress field which causes failures in the material. Friction Stir Processing (FSP) is a novel processing technique facilitate by the frictional heat generation between the tool and the workpiece. FSP can triumph over the poor properties due to large sized and unevenly distributed Si particle in the Al matrix. In this investigation, four different process FSP parameters have been used for processing the Al-Si hypereutectic material. Tensile properties, hardness and wear of the friction stir processed material were evaluated and correlated with the microstructure evolution. The characterization of FS-processed material is carried out using optical microscopy (OM), and scanning electron microscopy (SEM). The effect of different tool rotation speeds (800rpm, 1000rpm, 1200rpm, 1400rpm), and fixed traverse speed 22mm/min on microstructural formation, particle size and distribution in the matrix were analyzed and found that the tool speed of 1000rpm resulted in higher tensile 182Mpa, and elongation 7.5%. Higher tool speed 1400rpm could not enhanced the tensile strength further as a result of increasing Si particles, but resulted in increased average microhardness 83.7HV hardness, and wear properties due to dispersion and dissolve intemetallic particles into the stir zone.
Authors : Abdulmalik, S.S., Hammajam, A.A. and Feriyanto, D.
Category : Open Access Volume (Issue) : 11(1) Date Uploaded : 15th May 2025