Abstract
For thermodynamic prediction, the deoxidation equilibrium of aluminum in Fe-36%Ni alloy was investigated by employing a cold crucible under an Ar gas atmosphere at 1 773 K. The interaction parameters between aluminum and oxygen by taking liquid Fe-36%Ni alloy as the basis (i.e., solvent) are evaluated as follows: e Al O =-3.8, r Al O =0.9, e O Al =-6.4, r O Al =700, r Al,O Al =3.1, r Al,O O =833 within the composition range of [Al]<1 mass%. The equilibrium constant for reaction 2Al (in Fe-36%Ni) +3O (in Fe-36%Ni) =Al 2 O 3(s) was obtained in the temperature range of 1 773 to 1 973 K by using data from the present study and from previous works reported: log K AO =0.58-24 460/T The deoxidation equilibrium of aluminum in Fe-36%Ni can thus be thermodynamically described in the range of [Al]<1 mass% using both the first and second order interaction parameters as well as the equilibrium constant determined in this study.
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