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Integrated approach to thermodynamics, phase relations, liquid densities and solidification microstructures in the Al–Bi–Cu system

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Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 100 Issue 2

Abstract

Al – Bi – Cu phase equilibria were studied using dedicated thermal analysis and microstructural investigation of slowly solidified samples. Experimentation in the most decisive Cu-rich region was enabled by developing a BN insert in combination with Ta-encapsulation for these challenging samples. A consistent thermodynamic model of the Al – Bi – Cu system is developed for the first time and applied to calculations of the entire phase diagram. The liquid miscibility gap of Al – Bi alloys extends dramatically upon addition of Cu. The density difference of the two liquids was determined in dedicated experimentation on buoyancy forces. The useful composition and temperature range for these experiments in the ternary L′ + L′′ region was provided by the thermodynamic calculations. The density data can be well interpreted on the basis of presently calculated coexisting liquid phase compositions. Finally, distinct ternary monotectic features on solidification microstructures of Al – Bi – Cu alloys are revealed and inter-related with the phase formation from thermodynamic calculations.

Keywords: Thermodynamics; Phase transformation; Solidification; Density; Monotectic ternary Al-alloys
* Correspondence address, Prof. Rainer Schmid-Fetzer, Clausthal University of Technology, Institute of Metallurgy, Robert-Koch-Str. 42, D-38678 Clausthal-Zellerfeld, Germany, E-mail:

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Received: 2008-11-12
Accepted: 2008-12-1
Published Online: 2013-06-11
Published in Print: 2009-02-01

© 2009, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110009
Keywords for this article
Thermodynamics; Phase transformation; Solidification; Density; Monotectic ternary Al-alloys

Articles in the same Issue

  1. Contents
  2. Contents
  3. Feature
  4. Materials constitution and computational thermodynamics in the context of 100 years of IJMR – Zeitschrift für Metallkunde
  5. Upgrading CALPHAD to microstructure simulation: the phase-field method
  6. Prediction, determination and validation of phase diagrams via the global study of energy landscapes
  7. Alloy development using modern tools
  8. Phase equilibria and thermal analysis in the Fe–Mn–Ni system
  9. Integrated approach to thermodynamics, phase relations, liquid densities and solidification microstructures in the Al–Bi–Cu system
  10. Formation of clathrates Ba–M–Ge(M = Mn, Fe, Co)
  11. New paradigm of a metastable phase diagram presenting structural transformations induced by annealing of Si–C–N amorphous ceramics derived from polymer precursors
  12. Basic
  13. Thermodynamic assessment of the Ce–Si, Y–Si, Mg–Ce–Si and Mg–Y–Si systems
  14. Thermodynamic re-assessment of the Ti–Al–Nb system
  15. Effect of varying oxygen partial pressure on the properties of reactively evaporated zinc aluminate thin films
  16. Applied
  17. Matrix induced synthesis of Y3Al5O12: Ce phosphor through the Pechini method
  18. Microstructure and room temperature compressive properties of holmium doped DS NiAl-Cr(Mo)-Hf eutectic alloy
  19. Evaporation mechanism of aluminum during electron beam cold hearth melting of Ti64 alloy
  20. 560°C isothermal section of the Zn–Fe–Ni–Si quaternary system at the zinc-rich corner
  21. DGM News
  22. Personal
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