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Modeling particle fracture during the extrusion of aluminum/alumina composites

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Abstract

Particle fracture during the extrusion of a 6061/Al2O3/20p composite has been modeled using a modified comminution formulation. It has been assumed that the particles contain a Poisson distribution of flaws, and that the distribution is specific to the alumina and the method of production; the particle distribution in the extrudate was characterized by the Rosin-Rammler (RR) distribution. The model relates macroscopic deformation variables to fracture and, starting with the distribution in the as-cast material in each case, is able to predict with reasonable accuracy changes in size distribution for three extrusion ratios. Some discrepancy between prediction and experiment occurs at small sizes. This is believed to result mainly from inaccuracies in the measured data and effects of the continuous size distribution in representing a set of discontinuous data. The model is potentially generalizable to any particulate-reinforced metal matrix composite (MMC).

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Author notes

  1. C. H. J. Davies (Postdoctoral Fellow, Lecturer) & W. -C. Chen (Graduate Student, Research Engineer)

    Present address: the Centre for Metallurgical Process Engineering, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada

Authors and Affiliations

  1. the Department of Materials Engineering, Monash University, 3168, Clayton, Victoria, Australia

    C. H. J. Davies (Postdoctoral Fellow, Lecturer)

  2. Dynamic Systems Inc., 12140, Poestenkill, NY

    W. -C. Chen (Graduate Student, Research Engineer)

  3. Alcan International, Kingston Research and Development Centre, K7L 5L9, Kingston, ON, Canada

    D. J. Lloyd (Principal Scientist)

  4. the Centre for Metallurgical Process Engineering, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada

    E. B. Hawbolt (Professor), I. V. Samarasekera (Professor) & J. K. Brimacombe (Professor and Alcan Chair in Materials Process Engineering)

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  1. C. H. J. Davies
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  2. W. -C. Chen
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  3. D. J. Lloyd
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  5. I. V. Samarasekera
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  6. J. K. Brimacombe
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Davies, C.H.J., Chen, W.C., Lloyd, D.J. et al. Modeling particle fracture during the extrusion of aluminum/alumina composites. Metall Mater Trans A 27, 4113–4120 (1996). https://doi.org/10.1007/BF02595659

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  • DOI: https://doi.org/10.1007/BF02595659

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