Workability behavior of aluminium hybrid composites (P/M)

Abstract

Workability is a degree of the amount of deformation that a powder metallurgy bits and pieces can survive prior to fracture occurred in the forming or upsetting processes. Ductile fracture is the most general mode of breakdown in bulk forming process. The formability is a complicated happening, dependent upon the method as well as the material parameters. An investigational research work was performed for the kind of the working behavior of Al-SiC-Y2O3 hybrid composite under triaxial stress state circumstance. Upsetting of Al-SiC- Y2O3 powder metallurgy compacts with various aspect ratios and initial preform densities were carried out and the working behavior of the powder compacts at various state conditions was computed. In the powder metallurgy technique cold pressing can be used for compaction of the reinforcement of SiC and Y2O3 with Aluminum hybrid composites (Al+SiC+Y2O3). The bottle green compacts can be sintered and workability characteristics can be studied. In the hybrid composites, SiC content has been different from 0% to 20% with different particle sizes namely 60 and 80μm. Y2O3 nanoparticles of size 30-50nm and reinforced with 1wt%, 2wt% and 3wt%. The experimental Results can be analyzed for workability and frictional stress state conditions during upsetting as a role of relative density. The formability stress index values obtained for various addition of SiC and Y2O3. © (2014) Trans Tech Publications, Switzerland.