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An analysis of the microstructure of rapidly solidified Al-8 wt pct Fe powder

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Abstract

Rapidly solidified powders of Al-8 wt pct Fe exhibit four distinct microstructures with increasing particle diameter in the size range of 5 μm to 45 μm: microcellular α-Al; cellular α-Al; a-Al + Al6Fe eutectic; and Al3Fe primary intermetallic structure. Small powder particles (~10 μm or less) undercool significantly prior to solidification and typically exhibit a two-zone microcellular-cellular structure in individual powder particles. In the two-zone microstructure, there is a transition from solidification dominated by internal heat flow during recalescence with high growth rates (microcellular) to solidification dominated by external heat flow and slower growth rates (cellular). The origin of the two-zone microstructure from an initially cellular or dendritic structure is interpreted on the basis of growth controlled primarily by solute redistribution. Larger particles experience little or no initial undercooling prior to solidification and do not exhibit the two-zone structure. The larger particles contain cellular, eutectic, or primary intermetallic structures that are consistent with growth rates controlled by heat extraction through the particle surface (external heat flow).

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References

  1. H. Jones:Mats. Sci. & Eng., 1969J70, vol. 5, pp. 1–18.

    Article  CAS  Google Scholar 

  2. E. Blank:Z. Metallkunde, 1972, vol. 63, pp. 315–23.

    CAS  Google Scholar 

  3. P. Furrer and H. Warlimont:Z. Metallkunde, 1973, vol. 64, pp. 236–48.

    CAS  Google Scholar 

  4. M. H. Jacobs, A. G. Doggett, and M.J. Stowell:J. Mats. Sci., 1974, vol. 9, pp. 1631–43.

    Article  CAS  Google Scholar 

  5. D. J. Skinner, K. Okazaki, and CM. Adam: inRapidly Solidified Powder Aluminum Alloys, M. E. Fine and A. E. Starke, Jr., eds., ASTM-STP 890, Philadelphia, PA, 1986, pp. 211–36.

    Google Scholar 

  6. J. L. Murray:Mat. Res. Soc. Symp. Proc, 1983, vol. 19, pp. 249–62.

    CAS  Google Scholar 

  7. C. M. Adam and L. M. Hogan:J. Australian Inst. of Met., 1972, vol. 17, pp. 81–90.

    CAS  Google Scholar 

  8. I. R. Hughes and H. Jones:J. Mats.Sci., 1976, vol. 11,pp. 1781–93.

    Article  CAS  Google Scholar 

  9. J. H. Perepezko, S. E. LeBeau, B. A. Mueller, and G. J. Hildeman: inRapidly Solidified Powder Aluminum Alloys, M. E. Fine and A. E. Starke, Jr., eds., ASTM-STP 890, Philadelphia, PA, 1986, pp. 118–36.

    Google Scholar 

  10. C. G. Levi and R. Mehrabian:Metall. Trans. A, 1982, vol. 13A, pp. 221–34.

    CAS  Google Scholar 

  11. C. G. Levi and R. Mehrabian:Metall. Trans. A, 1982, vol. 13A, pp. 13–23.

    CAS  Google Scholar 

  12. T. W. Clyne:Metall. Trans. B, 1984, vol. 15B, pp. 369–81.

    CAS  Google Scholar 

  13. D. Shechtman and E. Gulmanis.Prak. Metallographie, 1981, vol. 18, pp. 587–93.

    CAS  Google Scholar 

  14. C. M. Adam: inRapidly Solidified Amorphous and Crystalline Alloys, B. H. Kear, B. C. Giessen, and M. Cohen, eds., Elsevier-North Holland, New York, NY, 1982, pp. 411–22.

    Google Scholar 

  15. S. Dushrr. and J. Lafferty:Scientific Foundations of Vacuum Technique, 2nd ed., John Wiley, New York, NY, 1962, p. 45.

    Google Scholar 

  16. J. Lipton, M. E. Glicksman, and W. Kurz:Mats. Sci. & Eng., 1984, vol. 65, pp. 57–63.

    Article  CAS  Google Scholar 

  17. W. J. Boettinger, S. R. Coriell, and R. F. Sekerka:Mats. Sci. & Eng., 1984, vol. 65, pp. 27–36.

    Article  CAS  Google Scholar 

  18. J. H. Perepezko and J. S. Paik: inRapidly Solidified Amorphous and Crystalline Alloys, B. H. Kear, B.C. Giessen, and M. Cohen, eds.Elsevier-North Holland, New York, NY, 1982, pp. 49–63.

    Google Scholar 

  19. W. J. Boettinger and S. R. Coriell: NATO Advanced Research Work- shop onRapid Solidification Technologies, P. Sahm, ed., Amberg, FRG, 1985.

  20. M. Rappaz, Ph. Thevoz, and W. Kurz: inNumerical Methods in Thermal Problems, Part 1, R. W. Lewis and K. Morgan, eds., Pine- ridge Press, Swansea, U.K., 1985, pp. 251–61.

    Google Scholar 

  21. M. J. Aziz:J. Appl. Phys., 1982, vol. 53, pp. 1158–68.

    Article  CAS  Google Scholar 

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Boettinger, W.J., Bendersky, L. & Early, J.G. An analysis of the microstructure of rapidly solidified Al-8 wt pct Fe powder. Metall Trans A 17, 781–790 (1986). https://doi.org/10.1007/BF02643853

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