Experimental study and thermodynamic modeling of the Al–Co–Cr–Ni system
- Univ. of Pittsburgh, Pittsburgh, PA (United States)
- 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
Web of Science
On the Simulation of Composition Profiles in NiCoCrAl Alloys During Al2O3 Scale Growth in Oxidation and Oxidation–Dissolution Regimes
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journal | October 2018 |
Investigation of spitting behaviour of NiCoCrAlY type materials during electron beam evaporation
|
journal | February 2020 |
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