Nanostructured cobalt powders synthesised by polyol process and consolidated by Spark Plasma Sintering: Microstructure and mechanical properties

► Cobalt nanoparticles produced by the polyol process present mainly the fcc metastable phase. ► Bulk nanostructured cobalt is obtained from the nano-particles by Spark Plasma Sintering consolidation. ► Nanotwins and stacking faults are present in every grain of the more dense sample. ► Yield strength and plastic domain may be varied depending on the nanoparticle size and the porosity of the consolidated material.