Friction-stir processing of an AA8026-TiB 2 -Al 2 O 3 hybrid nanocomposite: Microstructural developments and mechanical properties

摘要: Abstract In this study, micro- and nano-sized TiB 2 Al O 3 particles were incorporated separately simultaneously through the AA8026 aluminum base alloy during multi-pass friction stir processing (FSP) with 100% overlapping to fabricate metal matrix mono hybrid nanocomposites. Various FSP conditions including different rotational speeds ( w ), traverse velocities v pass numbers assessed attain a homogenous distribution of reinforcing Al-metal matrix. Moreover, impacts size (micro or nano) type reinforcement (TiB ) on process-ability single nanocomposite systems examined. Microstructures zones distributions ceramic Al-matrix under various studied characterized by using optical (OM), scanning (SEM), transmission electron microscopy (TEM) techniques, respectively. The main mechanical characteristics prepared nanocomposites, such as, indentation Vickers hardness, tensile properties, wear resistance measured compared for all conditions. By optimization parameters, as speed 1600 rpm velocity 40 mm/min after 4 passes, uniform AA8026-TiB -Al was attained significant improvements (~70–100%) in properties. As result, yield strength ~270 MPa, elongation ~4.5%, hardness ~141 HV obtained. Also, average rate reduced from 21×10 −3  mg/m value down 2.6×10 best processed nanocomposite. A direct relationship between demonstrated. Finally, effects (type size) microstructure properties FSPed nanocomposites addressed discussed.