Thermodynamics of the superalloys

Journal Article · Tue Jun 01 04:00:00 EDT 1982 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02643391· OSTI ID:6006196

Williams, R O

Using the parameters of Kaufman and Nesor, we have calculated the activities of Al, Ti, Cr, Fe, Co, Ni, Mo, and W in 17 superalloys. These components behave in three distinctly different ways: Al and Ti have very small activity coefficients; Fe, Co, and Ni have activity coefficients close to unity; and Cr, Mo, and W have activity coefficients of approximately 10. The calculated free energy of formation of the gamma prime in these alloys gives values similar to that for pure Ni/sub 3/Al. The calculations of the free energy change for the formation of a Cr-Co sigma phase give a lower estimate of the potential for sigma formation. These results show that the presently available thermodynamic representations and parameters are capable of providing useful information on very complex systems.

• Research Organization: Oak Ridge National Lab., TN
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6006196
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 13; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ENERGY
FORMATION FREE ENERGY
FREE ENERGY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
PHASE STUDIES
PHYSICAL PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES
THERMODYNAMICS