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Macrosegregation and sedimentation in liquid-phase sintering

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Abstract

Macrosegregation has been observed in a series of Pb-Sn alloys isothermally treated in an α + L (or β + L) two-phase region. Depending on the alloy composition, the Pb-rich α (or the Sn-rich β) solid phase quickly settles (or floats) to the bottom (or top) of the crucible as the alloy is heated into the solid-plus-liquid two-phase region. This settling or floating persists until such time as a skeletal solid structure is formed at the crucible bottom or top. The skeleton (the “mushy” zone) resembles liquid-phase-sintered structures; that is, it consists of interconnected solid and liquid phases. The initial settling can give rise to macrosegregation. Elimination of macrosegregation requires substantial time and is accompanied by a reduction in length of the mushy zone, giving rise to apparent sedimentation of this zone. We argue that this sedimentation results from the compositional readjustments accompanying macrosegregation elimination. On this basis, it appears that many observations of sedimentation in liquid-phase-sintered structures are due to these readjustments.

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References

  1. Y. Liu, D.F. Heaney, and R.M. German: Acta Metall. Mater., 1995, vol. 43, pp. 1587–92.

    Article  CAS  Google Scholar 

  2. T.H. Courtney: Scripta Mater., 1996, vol. 35, pp. 567–71.

    Article  CAS  Google Scholar 

  3. A.N. Niemi and T.H. Courtney: Acta Metall., 1983, vol. 31, pp. 1393–1401.

    Article  CAS  Google Scholar 

  4. T.H. Courtney, Y. Du, and S.Z. Lu: Metall. Mater. Trans. A, 2000, vol. 31A, pp. 2907–16.

    CAS  Google Scholar 

  5. C. San Marchi, L. Felberbaum, and A. Mortensen: Metall. Mater. Trans. A, 2000, vol. 31A, pp. 397–400.

    Google Scholar 

  6. Binary Alloy Phase Diagrams, 2nd ed., T.B. Massalski, ed., ASM INTERNATIONAL, Materials Park, OH, 1990, vol. 3, pp. 3014–15.

    Google Scholar 

  7. S.C. Hardy and P.W. Voorhees: Metall. Trans. A, 1988, vol. 19A, pp. 2713–21.

    CAS  Google Scholar 

  8. D.R. Poirier: Metall. Trans. A, 1988, vol. 19A, pp. 2349–54.

    CAS  Google Scholar 

  9. W. Kurz and D.J. Fisher: Fundamentals of Solidification, Trans Tech Publications, Rockport, MA, 1984, pp. 241–42.

    Google Scholar 

  10. R.M. Jordan and J.D. Hunt: Metall. Trans., 1971, vol. 2, pp. 3401–10.

    CAS  Google Scholar 

Download references

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, Michigan Technological University, 49931, Houghton, MI

    Y. Du (Research Assistant), S. Z. Lu (Research Associate Professor) & T. H. Courtney (Professor)

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  1. Y. Du
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  2. S. Z. Lu
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  3. T. H. Courtney
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Du, Y., Lu, S.Z. & Courtney, T.H. Macrosegregation and sedimentation in liquid-phase sintering. Metall Mater Trans A 32, 3091–3097 (2001). https://doi.org/10.1007/s11661-001-0183-x

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  • DOI: https://doi.org/10.1007/s11661-001-0183-x

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