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.
Highlights
R Powder metallurgy (P/M) is a extremely developed method of manufacturing accurate metal parts
In the development of new aerospace alloys based on aluminium, E titanium and super alloys, P/M technique plays a predominant role [1]
Powder metallurgy preforms with various percentages and aspect ratios were discussed for studying the behavior of workability during cold upsetting under triaxial stress state condition
Summary
R Powder metallurgy (P/M) is a extremely developed method of manufacturing accurate metal parts. 984-985 description of the workability of a material is specified by its flow stress which depends on processing variables such as strain, strain rate, preheat temperature, die temperature, its failure behavior and the metallurgical transformation that characterize the alloy system to which it belongs. Narayanasamy et al [29,30] performed the work on the strain hardening behavior of the powder metallurgy composites. Powder metallurgy preforms with various percentages and aspect ratios were discussed for studying the behavior of workability during cold upsetting under triaxial stress state condition. The present investigation is an attempt to evaluate the effect of the percentage on the workability parameter under triaxial stress state condition. Ε true strain εz true strain in the axial direction ε0 true strain in the hoop direction εr true strain in the radial direction β formability Stress Index ρo initial preform density of the perform (g/cc) ρf density of the preform after deformation(g/cc) ρth theoretical density of the fully dense material (g/cc) σθ/reff stress ratio parameter εm true mean strain ho/Do aspect ratio
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