Aluminum alloy welding fillers must provide suitable as-welded mechanical performance while remaining compatible with the base material and welding conditions. This study evaluates aluminum-based fillers reinforced with NbB₂ nanoparticles as alternatives to commercial AA5356 for welding AA6061. NbB₂ nanoparticles were synthesized by high-energy ball milling, mechanically alloyed with aluminum powder to form Al/NbB₂ pellets, incorporated into molten Al–Mg alloy at 750 °C, cast, cold-formed, and used as filler wires in the tungsten inert gas welding process. The 2 wt.
The features of plastic deformation of dispersion-strengthened vanadium V-Cr-W-Zr alloy at different temperatures have been studied using scanning and transmission electron microscopy. Alloy samples after chemical-heat treatment by internal oxidation were subjected to tension at room and elevated (800 °C, 900 °C and 1000 °C) temperatures. It has been established that under conditions of suppressed dislocation and diffusion activity at room temperature the tension process is accompanied by the formation of ultrafine-grained structural state in the region of deformation localization through the implementation of the dislocation disclination mechanism. The subsequent plastic deformation and fracture in the neck area actually occur in a material with ultrafine-grained structure, which explains the combination of a high level of strength and ductility. An increase in the tension temperature is accompanied by a monotonic decrease in the characteristics of strength and ductility. Thermal activation of dislocation mechanisms prevents the attainment of necessary conditions for the implementation of cooperative deformation modes in the region of deformation localization.
