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On the Thermodynamics and Kinetics of TCP Phase Precipitation in Re‐ and Ru‐ Containing Ni‐base Superalloys
Author(s) -
Matuszewski Kamil,
Müller Alexander,
Ritter Nils,
Rettig Ralf,
Kurzydłowski Krzysztof J.,
Singer Robert F.
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500173
Subject(s) - calphad , superalloy , materials science , precipitation , thermodynamics , phase (matter) , electron probe microanalysis , scanning electron microscope , kinetic energy , phase diagram , metallurgy , microstructure , chemistry , composite material , physics , organic chemistry , quantum mechanics , meteorology
Three experimental Ni‐base superalloys of the second, third and fourth generation are studied in this work to clarify the effect of Re and Ru on the precipitation of TCP phases. Thermodynamic calculations using the CALPHAD method are performed based on the local chemical composition obtained with the use of electron probe microanalysis. The effects of microsegregation and γ′‐precipitation are taken into account. The results, complemented with scanning electron microscopy observations, show that Re increases, while Ru decreases the inclination of the material to precipitate TCP phases. The effect of both elements is assigned to thermodynamic rather than kinetic reasons. The CALPHAD‐calculations do predict the effect of Re on the TCP phase formation in the investigated alloys correctly, but not the effect of Ru.