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TECHNICAL PAPERS

Cold Compaction of Composite Powders

[+] Author and Article Information
K. T. Kim, J. H. Cho, J. S. Kim

Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea

J. Eng. Mater. Technol 122(1), 119-128 (Jul 16, 1999) (10 pages) doi:10.1115/1.482775 History: Received April 13, 1998; Revised July 16, 1999
Copyright © 2000 by ASME
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References

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Shima,  S., and Oyane,  M., 1976, “Plasticity Theory for Porous Metals,” Int. J. Mech. Sci., 18, pp. 285–291.
Arzt,  E., 1982, “The Influence of an Increasing Particle Coordination on the Densification of Spherical Powders,” Acta Metall., 30, pp. 1883–1890.
Helle,  A. S., Easterling,  K. E., and Ashby,  M. F., 1985, “Hot-Isostatic Pressing Diagrams: New Developments,” Acta Metall., 33 No. 12, pp. 2163–2174.
Fleck,  N. A., Kuhn,  L. T., and McMeeking,  R. M., 1992, “Yielding of Metal Powder Bonded by Isolated Contacts,” J. Mech. Phys. Solids, 40, No. 5, pp. 1139–1162.
Fleck,  N. A., 1995, “On the Cold Compaction of Powders,” J. Mech. Phys. Solids, 43, No. 9, pp. 1409–1431.
Larsson,  P.-L., Biwa,  S., and Storåkers,  B., 1996, “Analysis of Cold and Hot Isostatic Compaction of Spherical Particles,” Acta Mater., 44, No. 9, pp. 3655–3666.
Fleck, N. A., Storåkers, B., and McMeeking, R. M., 1997, “The Viscoplastic Compaction of Powders,” IUTAM Symposium on Mechanics of Granular and Porous Materials, 15–17 July 1996, Cambridge, England, eds. N. A. Fleck and A. C. F. Cocks, Kluwer Academic Publishers, Amsterdam, pp. 1–10.
Lange,  F. F., Atteraas,  L., Zok,  F., and Porter,  J. R., 1991, “Deformation Consolidation of Metal Powders Containing Steel Inclusions,” Acta Metall. Mater., 39, No. 2, pp. 209–219.
Besson,  J., and Evans,  A. G., 1992, “The Effect of Reinforcements on the Densification of A Metal Powder,” Acta Metall. Mater., 40, No. 9, pp. 2247–2255.
Gurson, A., and McCabe, T., 1992, “Experimental Determination of Yield Functions for Compaction of Blended Metal Powders,” Proc. MPIF/APMI World Congress on Powder Metallurgy and Particular Materials, 21–26 June, 1992, San Francisco, California, U.S.A.
Turner,  C. D., and Ashby,  M. F., 1996, “The Cold Isostatic Pressing of Composite Powders—I. Experimental Investigations Using Model Powders,” Acta Mater., 44, No. 11, pp. 4521–4530.
Jefferson,  G., Bassani,  J. L., Xu,  J., and McMeeking,  R. M., 1994, “Densification by Plastic Deformation around Spherical Inclusions,” Int. J. Solids Struct., 31, No. 22, pp. 3059–3077.
Besson,  J., 1995, “Effect of Inclusion Shape and Volume Fraction on the Densification of Particulate Composites,” Mech. Mater., 19, pp. 103–117.
Bouvard,  D., 1993, “Modelling The Densification of Powder Composites by Power Law Creep,” Acta Metall. Mater., 41, No. 5, pp. 1413–1420.
Zavaliangos, A., and Wen, J., 1997, “The Effects of Mixing Quality on the Densification of Heterogeneous Powder Mixtures by Pressure,” Proc. International Workshop on Modelling of Metal Powder Forming Process, 21–23 July 1997, Grenoble, France, pp. 179–188.
Storåkers,  B., Fleck,  N. A., and McMeeking,  R. M., 1999, “The Viscoplastic Compaction of Composite Powders,” J. Mech. Phys. Solids, 47, pp. 785–815.
Yih, W. H., and Wang, C. T., 1979, Tungsten, Plenum Press, N.Y., pp. 282–289.
Matthews,  J. R., 1980, “Indentation Hardness and Hot Pressing,” Acta Metall., 28, pp. 311–318.
Storåkers, B., 1997, “Local Contact Behavior of Viscoplastic Particles,” IUTAM Symposium on Mechanics of Granular and Porous Materials, 15–17 July 1996, Cambridge, England, eds. N. A. Fleck and A. C. F. Cocks, Kluwer Academic Publishers, Amsterdam, pp. 173–184.
Biwa,  S., and Storåkers,  B., 1995, “An Analysis of Fully Plastic Brinell Indentation,” J. Mech. Phys. Solids, 43, No. 8, pp. 1303–1333.

Figures

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Scanning electron micrographs of (a) Cu powder and (b) W powder
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Uniaxial stress-plastic strain relation for dense copper
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Uniaxial stress-plastic strain relation for dense tungsten
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Optical micrographs of 40 vol% of W in Cu composite powder compacts at various hydrostatic pressure
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Optical micrographs of composite powder compacts with various vol% of W in Cu under cold isostatic pressing at 250 MPa
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Comparisons between experimental data and theoretical predictions from the proposed model for the variation of relative density with hydrostatic pressure of composite powders with various vol% of W in Cu under cold isostatic pressing
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Comparisons between experimental data and theoretical predictions from various models for the variation of relative density with hydrostatic pressure of (a) 20 (b) 40 (c) 60 (d) 80 vol% of W in Cu under cold isostatic pressing
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Optical micrographs of 40 vol% of W in Cu composite powder compacts at various pressures
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Optical micrographs of composite powder compacts with various vol% of W in Cu under cold die compaction at 300 MPa
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Comparisons between experimental data and theoretical predictions from the present model for the variations of relative density with pressure of composite powders with various vol% of W in Cu under cold die compaction
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Comparisons between epxerimental data and theoretical predictions from the present model and the model by Storåkers et al. 17 for the variations of relative density with pressure of composite powders with various vol% of W in Cu under cold die compaction

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