Metallurgical Transactions B

, Volume 19, Issue 3, pp 459–463 | Cite as

Measurement and modeling of Alloy-Spinel-Corundum equilibrium in the Ni-Mn-Al-0 system at 1873 K

  • S. Shashidhara Pandit
  • K. T. Jacob
Physical Chemistry


The oxygen content of liquid Ni-Mn alloy equilibrated with spinel solid solution, (Ni,Mn)O. (1 +x)A12O3, and α-Al2O3 has been measured by suction sampling and inert gas fusion analysis. The corresponding oxygen potential of the three-phase system has been determined with a solid state cell incorporating (Y2O3)ThO2 as the solid electrolyte and Cr + Cr2O3 as the reference electrode. The equilibrium composition of the spinel phase formed at the interface of the alloy and alumina crucible was obtained using EPMA. The experimental data are compared with a thermodynamic model based on the free energies of formation of end-member spinels, free energy of solution of oxygen in liquid nickel, interaction parameters, and the activities in liquid Ni-Mn alloy and spinel solid solution. Mixing properties of the spinel solid solution are derived from a cation distribution model. The computational results agree with the experimental data on oxygen concentration, potential, and composition of the spinel phase.


Metallurgical Transaction Spinel Phase Oxygen Potential Cation Distribution Manganese Concentration 
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Copyright information

© The Metallurgical Society and ASM INTERNATIONAL 1988

Authors and Affiliations

  • S. Shashidhara Pandit
    • 1
  • K. T. Jacob
    • 1
  1. 1.Department of MetallurgyIndian Institute of ScienceBangaloreIndia

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