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A powder-based approach to semisolid processing of metals for fabrication of die-castings and composites

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Abstract

A technique is presented for the generation of a globular (non-dendritic) array of solid fragments surrounded by a solute-enriched liquid. This is based on the premixing, heat treatment and consolidation of different types of powder. The resultant slurries have then been injected into a die at high velocity. The technique offers promise in terms of the versatility with which the slurry microstructure can be controlled and the soundness of the resulting die-castings has been encouraging. Among the effects investigated are the role of solute diffusion, the importance of globule size and the nature of coarsening phenomena. Experiments have also been carried out on the incorporation of ceramic fibres into the product and this appears to offer promise as a composite fabrication route. The work described here concerns only aluminium-base material alloyed with magnesium, although the principles outlined are expected to apply to many other systems.

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Abbreviations

C :

composition (mass fraction)

d (m):

diameter

D (m2 sec−):

diffusivity

f :

volume fraction

k :

partition coefficient

L (m):

characteristic length

Q (J mol−):

activation energy

r (m):

radius

R (J K−mol−):

gas constant

Re :

Reynolds number

t (sec):

time

T (K):

temperature

u (m sec−):

fluid velocity

We :

Weber number

λ:

aspect ratio

µ (Pa sec):

dynamic viscosity

ϱ (kgm−3):

density

σ (Jm−2):

surface tension

d:

dispersoid

f:

fusion point

g:

globule

L:

liquidus

m:

matrix

r:

relaxation

s:

solid

S:

solidus

*:

solid/liquid interface

References

  1. D. B. Spencer, R. Mehrabian andM. C. Flemings,Met. Trans. 3 (1972) 1925.

    Google Scholar 

  2. R. Mehrabian andM. C. Flemings,Trans. Amer. Foundryman Soc. 80 (1972) 173.

    Google Scholar 

  3. M. C. Flemings, R. G. Riek andK. P. Young,Mat. Sci. Eng. 25 (1976) 103.

    Google Scholar 

  4. D. G. Backman, R. Mehrabian andM. C. Flemings,Met. Trans. B. 8B (1977) 471.

    Google Scholar 

  5. M. Suery andM. C. Flemings,Metall. Trans. A 13A (1982) 1809.

    Google Scholar 

  6. B. Seymour, L. E. Skinner andG. H. West,Metall. Mater. Technol. (September) (1983) 445.

  7. S. D. E. Ramati, G. J. Abbaschian, D. G. Backman andR. Mehrabian,Met. Trans. B,9B (1978) 279.

    Google Scholar 

  8. L. Lehuy, J. Masounave andJ. Blain,J. Mater. Sci. 20 (1985) 105.

    Google Scholar 

  9. G. B. Brook,Materials and Design,3 (1982) 558.

    Google Scholar 

  10. R. G. Riek, A. Vrachnos, K. P. Young, N. Matsumoto andR. Mehrabian,Trans. AFS 83 (1975) 25.

    Google Scholar 

  11. M. Yoshikawa andT. Asaeda,Bull. JSME 23 (1980) 476.

    Google Scholar 

  12. G. H. Geiger andD. R. Poirer, “Transport Phenomena in Metallurgy” (Addison Wesley, Reading, Massachusetts, 1973) p. 31.

    Google Scholar 

  13. P. A. Joly andR. Mehrabian,J. Mater. Sci. 11 (1976) 1393.

    Google Scholar 

  14. K. P. Young, R. G. Riek andM. C. Flemings, in “Solidification and Casting of Metals” (The Metals Society, London, 1979) pp. 510–17.

    Google Scholar 

  15. M. C. Flemings andR. Mehrabian,Trans. AFS 81 (1973) 81.

    Google Scholar 

  16. T. Gillespie,J. Colloid Interface Sci. 94 (1983) 166.

    Google Scholar 

  17. G. W. Swatzbeck andT. Z. Kattamis,J. Mater. Sci. 9 (1974) 635.

    Google Scholar 

  18. H. F. Fischmeister- andL. E. Larsson,Powder Metall. 17 (1974) 227.

    Google Scholar 

  19. G. Langford andD. Apelian,J. Metals 23 (1980) 28.

    Google Scholar 

  20. B. C. Pai andH. Jones, in “Solidification Technology in the Foundry and Casthouse” (The Metals Society, London, 1983) pp. 126–300.

    Google Scholar 

  21. H. D. Brody andM. C. Flemings,Trans. TMS AIME 236 (1966) 615.

    Google Scholar 

  22. T. W. Clyne andW. Kurz,Met. Trans. A 12A (1981) 965.

    Google Scholar 

  23. V. Laxmann andM. C. Flemings,ibid. 11A (1980) 1927.

    Google Scholar 

  24. A. Vogel,Metal Sci. 12 (1978) 576.

    Google Scholar 

  25. C. J. Smithells, “Metals Reference Book” (Butterworths, London, 1967) p. 675.

    Google Scholar 

  26. C. H. Kang andD. N. Yoon,Met. Trans. A 12A (1981) 65.

    Google Scholar 

  27. S. S. Kim andD. N. Yoon,Acta Metall. 31 (1983) 1151.

    Google Scholar 

  28. P. W. Voorhees andM. E. Glicksman,Met. Trans. A 15A (1984) 1081.

    Google Scholar 

  29. H. H. Park, S. J. Cho andD. N. Yoon,ibid. 15A (1984) 1075

    Google Scholar 

  30. T. H. Courtney,ibid. 15A (1984) 1065.

    Google Scholar 

  31. K. Tabeshfar andG. A. Chadwick,Powder Metall. 27 (1984) 19.

    Google Scholar 

  32. I. M. Lifshitz andV. V. Slyozov,Phys. Chem. Sol. 19 (1961) 35.

    Google Scholar 

  33. C. Wagner,Z. Electrochem. 65 (1978) 489.

    Google Scholar 

  34. T. W. Clyne, M. G. Bader, G. R. Cappleman andP. A. Hubert,J. Mater. Sci. 20 (1985) 85.

    Google Scholar 

  35. M. C. Flemings andG. E. Nereo,Trans. TMS AIME 239 (1967) 1449.

    Google Scholar 

  36. M. C. Flemings, R. Mehrabian andG. E. Nereo,ibid. 242 (1968) 41.

    Google Scholar 

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Author notes

  1. T. W. Clyne

    Present address: Department of Metallurgy and Materials Science, Pembroke Street, Cambridge, UK

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Surrey, Guildford, Surrey, UK

    R. M. K. Young & T. W. Clyne

Authors
  1. R. M. K. Young
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  2. T. W. Clyne
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Young, R.M.K., Clyne, T.W. A powder-based approach to semisolid processing of metals for fabrication of die-castings and composites. J Mater Sci 21, 1057–1069 (1986). https://doi.org/10.1007/BF01117395

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  • DOI: https://doi.org/10.1007/BF01117395

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