The Front Cover shows a captivating image of two gears intricately interlocking and merging into one another. Metaphorically, gear represents the concept free aluminylene, while other embodies diverse boron Lewis acids. As these unite, they give rise to distinct forms aluminum−boron-bonded compounds. One variant encompasses an aluminum−boron electron-sharing bond, manifests dative bond. This di...

Friction stir spot welding (FSSW) of dissimilar S45C steel and 6061-T6 aluminum alloy in a butt configuration is experimentally investigated. Butt performed using convex scrolled shoulder tool at different rotational speeds. FSSW joints are successfully fabricated by offsetting the to side. The microstructures three speeds characterized scanning electron microscopy energy dispersive spectrometr...