Investigation of Tribological Behavior on the Mechanical Properties of TiB۲, Al۲O۳ Reinforced AA۶۰۶۱ Matrix Sintered Hybrid Composites

Hybrid composites consisting of AA۶۰۶۱ matrix reinforced with TiB۲ (۲, ۴, ۶, and ۸ wt. %), Al۲O۳ (۲ wt. %) particles were produced by the sintering process. In comparison to the base material AA۶۰۶۱, the composite produced had improved mechanical properties. The sintered composites' mechanical properties, such as tensile strength and hardness, are measured and compared to the wear-tested specimen. Optical micrographs reveal that composites were riddled with defects like blowholes, pinholes, and improper bonding between the particulates before sintering. However, the post-sintered optical micrograph showed that the defects were greatly suppressed. Micrographic images revealed the changes in surface characteristics before and after wear. Until a sliding distance of ۲۶۰ m, the wear rate of the hybrid composites was kept lower than that of the base material. The coefficient of all the composite materials produced for this study was noted to be less than that of the base material. The results reveal that the hardness of hybrid composites having ۴ wt. % and ۶ wt. % of TiB۲ particulates increased by ۵.۹۸ % and ۱.۳۵ %. Because of the frictional heating during the wear test, the tensile properties lowered by up to ۴۹.۶%. It is concluded that the hybrid composites having ۴ wt. % and ۶ wt. % of TiB۲ particulates exhibited less wear rate for extended sliding distance, good hardness, moderate tensile strength, and decent elongation percentage compared to its counterparts.

کلیدواژه ها:

Hybrid composites ، sintering ، tensile strength ، micro hardness ، wear ، coefficient of friction.