Partition Behavior of Alloying Elements in Nickel-Based Alloys and Their Activity Interaction Parameters and Infinite Dilution Activity Coefficients

The partition behavior of alloying elements between the γ’ and γ phases in Nickel-based alloys was investigated by using infinite dilution activity coefficient and activity interaction parameter. The results showed that the preferential partition behavior of elements in the γ’ and γ phases is related to its infinite dilution activity coefficient (\ln \gamma _i^0). When \ln \gamma _i^0 \ll 0, the element i has a strong tendency to partition in the γ’ phase; When \ln \gamma _i^0 approaches to zero, the element i has preferentially partition to the matrix γ phase. In addition, the partition behavior of element i in the γ’ and γ phases is also affected by the third element j in Nickel-based alloys, and this effect can be distinguished by the sign of the second-order activity interaction parameter \rho _i^{ij}.

A modified UNIFAC-ZM model and phase equilibrium prediction of silicone polymers with ABE solution

Modification of the UNIFAC-ZM model was made with consideration of temperature effect on group interaction. The new model agreed with experimental results of infinite dilution activity coefficient well and could be applied for the prediction of phase equilibrium of PDMS.