Measurement and modeling of alloy-spinel-corundum equilibrium in the Ni-Mn-Al-0 system at 1873 K

Pandit, S. Shashidhara ; Jacob, K. T. (1988) Measurement and modeling of alloy-spinel-corundum equilibrium in the Ni-Mn-Al-0 system at 1873 K Metallurgical and Materials Transactions B, 19 (3). pp. 459-463. ISSN 1073-5615

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Related URL: http://dx.doi.org/10.1007/BF02657744

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:13074
Deposited On:11 Nov 2010 06:56
Last Modified:16 May 2016 22:18

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