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Title: Experimental study and thermodynamic modeling of the Al–Co–Cr–Ni system

Journal Article · · Science and Technology of Advanced Materials
 [1];  [2];  [2];  [2];  [1]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  2. The Pennsylvania State Univ., University Park, PA (United States)

In this study, a thermodynamic database for the Al–Co–Cr–Ni system is built via the Calphad method by extrapolating re-assessed ternary subsystems. A minimum number of quaternary parameters are included, which are optimized using experimental phase equilibrium data obtained by electron probe micro-analysis and x-ray diffraction analysis of NiCoCrAlY alloys spanning a wide compositional range, after annealing at 900 °C, 1100 °C and 1200 °C, and water quenching. These temperatures are relevant to oxidation and corrosion resistant MCrAlY coatings, where M corresponds to some combination of nickel and cobalt. Comparisons of calculated and measured phase compositions show excellent agreement for the β–γ equilibrium, and good agreement for three-phase β–γ–σ and β–γ–α equilibria. An extensive comparison with existing Ni-base databases (TCNI6, TTNI8, NIST) is presented in terms of phase compositions.

Research Organization:
Univ. of Pittsburgh, PA (United States); Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0024056
OSTI ID:
1239687
Journal Information:
Science and Technology of Advanced Materials, Vol. 16, Issue 5; ISSN 1468-6996
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (2)

On the Simulation of Composition Profiles in NiCoCrAl Alloys During Al2O3 Scale Growth in Oxidation and Oxidation–Dissolution Regimes journal October 2018
Investigation of spitting behaviour of NiCoCrAlY type materials during electron beam evaporation journal February 2020