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

Gheno, Thomas and Liu, Xuan L and Lindwall, Greta and Liu, Zi-Kui and Gleeson, Brian (2015) Experimental study and thermodynamic modeling of the Al–Co–Cr–Ni system. Science and Technology of Advanced Materials, 16 (5). 055001. ISSN 1468-6996

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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.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Liu, Xuan L
Lindwall, Greta
Liu, Zi-Kui
Date: 21 September 2015
Date Type: Publication
Journal or Publication Title: Science and Technology of Advanced Materials
Volume: 16
Number: 5
Page Range: 055001
DOI or Unique Handle: 10.1088/1468-6996/16/5/055001
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: No
ISSN: 1468-6996
Official URL:
Article Type: Research Article
Date Deposited: 13 May 2020 16:42
Last Modified: 13 May 2020 16:42


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