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Kinetics of Phase Separation in a Hypermonotectic Al–Pb Alloy

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Veröffentlicht/Copyright: 14. Dezember 2021
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 89 Heft 4

Abstract

A numerical model is presented that describes the microstructure evolution in liquid immiscible alloys under the common action of nucleation, diffusional growth and drop motion during continuous cooling through the miscibility gap. The model is satisfactorily verified by comparison with an analytically solvable case. The numerical results for an Al-5 wt.% Pb alloy cooled with 10,20 and 50 K/s from a temperature above the binodal show that the simultaneous action of Marangoni migration and Stokes settlement governs the macrosegregation of Pb. At low cooling rates a Pb film establishes by Stokes motion at bottom, at high cooling rates the Pb droplets accumulate in the middle part of a cylindrical sample due to the strong Marangoni motion opposing gravity induced sedimentation. The average drop radius does not vary with position in the sample at high cooling rates. At small cooling rates a slight variation with position is predicted.

J. Zhao, L. Ratke Institut für Raumsimulation DLR Köln 51140 Köln, Germany

  1. One of the authors (J. Zhao) gratefully acknowledges the financial support from the Alexander von Humboldt Foundation. He is also very grateful to S. Drees, S. Sous, G. Korekt and D. Tscheuschner for their valuable help.

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Received: 1997-12-15
Published Online: 2021-12-14

© 1998 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Aufsätze
  3. Kinetics of Phase Separation in a Hypermonotectic Al–Pb Alloy
  4. Liquid–Liquid Interfacial Tension in the Demixing Metal Systems Ga–Hg and Ga–Pb
  5. Preparation, Structure and Physical Properties of Fe-, Co- and Ni-rich Melt-quenched Ribbons Containing Zr or Hf – Part IV: Thermal Stability; DSC, TEM and Thermomagnetic Studies
  6. Fractal Aggregation in MgO-B2O3-SiO2 Slag
  7. Phase Equilibria of the Decagonal AlCoNi Phase
  8. Free Energy of Mixing and Vapour Pressure of Liquid Ga-As, In-As, Ga-P and In-P Alloys
  9. Phase Equilibria in the Dy–Fe–Nd System at 500 °C
  10. Determination of Stress Gradients by X-ray Diffraction: Comparison of Different Methods and Applications
  11. Non-Linear Denoising with Wavelet Transformation
  12. Effect of Cold Working and Annealing on Grain Size and Hardness of a Zr-2.5Nb Alloy
  13. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  14. Personen
  15. Buchbesprechungen
  16. Terminkalender
https://doi.org/10.3139/ijmr-1998-0044

Artikel in diesem Heft

  1. Frontmatter
  2. Aufsätze
  3. Kinetics of Phase Separation in a Hypermonotectic Al–Pb Alloy
  4. Liquid–Liquid Interfacial Tension in the Demixing Metal Systems Ga–Hg and Ga–Pb
  5. Preparation, Structure and Physical Properties of Fe-, Co- and Ni-rich Melt-quenched Ribbons Containing Zr or Hf – Part IV: Thermal Stability; DSC, TEM and Thermomagnetic Studies
  6. Fractal Aggregation in MgO-B2O3-SiO2 Slag
  7. Phase Equilibria of the Decagonal AlCoNi Phase
  8. Free Energy of Mixing and Vapour Pressure of Liquid Ga-As, In-As, Ga-P and In-P Alloys
  9. Phase Equilibria in the Dy–Fe–Nd System at 500 °C
  10. Determination of Stress Gradients by X-ray Diffraction: Comparison of Different Methods and Applications
  11. Non-Linear Denoising with Wavelet Transformation
  12. Effect of Cold Working and Annealing on Grain Size and Hardness of a Zr-2.5Nb Alloy
  13. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  14. Personen
  15. Buchbesprechungen
  16. Terminkalender
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