MODELING PARTICLE FRACTURE DURING THE EXTRUSION OF ALUMINUM ALUMINA COMPOSITES/

Citation
Chj. Davies et al., MODELING PARTICLE FRACTURE DURING THE EXTRUSION OF ALUMINUM ALUMINA COMPOSITES/, Metallurgical and materials transactions. A, Physical metallurgy andmaterials science, 27(12), 1996, pp. 4113-4120
Citations number
24
Categorie Soggetti
Metallurgy & Metallurigical Engineering","Material Science
ISSN journal
10735623
Volume
27
Issue
12
Year of publication
1996
Pages
4113 - 4120
Database
ISI
SICI code
1073-5623(1996)27:12<4113:MPFDTE>2.0.ZU;2-X
Abstract
Particle fracture during the extrusion of a 6061/Al2O3/20p composite h as been modeled using a modified comminution formulation. It has been assumed that the particles contain a Poisson distribution of flaws, an d that the distribution is specific to the alumina and the method of p roduction; the particle distribution in the extrudate was characterize d by the Rosin-Rammler (RR) distribution. The model relates macroscopi c deformation variables to fracture and, starting with the distributio n in the as-cast material in each case, is able to predict with reason able accuracy changes in size distribution for three extrusion ratios. Some discrepancy between prediction and experiment occurs at small si zes. This is believed to result mainly from inaccuracies in the measur ed data and effects of the continuous size distribution in representin g a set of discontinuous data. The model is potentially generalizable to any particulate-reinforced metal matrix composite (MMC).