Abstract
Abstract 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 γ i 0 \ln \gamma _i^0 ). When ln γ i 0 ≪ 0 \ln \gamma _i^0 \ll 0 , the element i has a strong tendency to partition in the γ’ phase; When ln γ i 0 \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 ρ i i j \rho _i^{ij} .
Highlights
Nickel-based alloys have important applications in hightemperature fields as they can offer outstanding properties both in mechanical strength and resistance to surface degradation, even when the environment temperature approaches to 90% of their melting temperatures [1]
The results showed that the preferential partition behavior of elements in the γ’ and γ phases is related to its infinite dilution activity coefficient
Adding Ru promotes both Ta and Al to partition in the γ phase, in Figure 3, εRTau and εRAul are located at the two side of the zero line. This implies that the change of the partition behavior of the element i that it caused by the third element j or j’s concentration in Nickel-based alloys cannot be well separated by the sign of their first-order activity interaction parameter εij
Summary
Nickel-based alloys have important applications in hightemperature fields as they can offer outstanding properties both in mechanical strength and resistance to surface degradation, even when the environment temperature approaches to 90% of their melting temperatures [1]. Abstract: 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.
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