Differentiation in the SiC Filler Size Effect in the Mechanical and Tribological Properties of Friction-Spot-Welded AA5083-H116 Alloy

Ceramic reinforced friction stir spot-welding (FSSW) is one of the unique welding techniques used to fabricate spot joints. This study intended investigate effect reinforcement additive particle size in achieving higher weld strengths. AA5083-H116 aluminum alloy plates were welded with nano- and micro-sized silicon carbide (SiC) particles. Investigations joints prepared using a tool rotational speed 1300 rpm, plunge rate 25 mm/min, dwell time 10 s revealed that lap shear tensile strength hardness nano-SiC particles added than those micro-SiC In particular, provided 29.6% 23.3% unfilled FSSW. The uniformly dispersed fine SiC processed zone more nucleation sites for re-precipitation new grains precipitates matrix. X-ray diffraction results confirmed there was no evidence phase (intermetallic compounds). Reinforcement significantly enhanced wear characteristics, as well (26.3%). Field emission scanning electron microscopy (FESEM) evidenced uniform distribution nugget zone. addition, fractography samples presented discussed.