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

Thomas Gheno, Xuan L. Liu, Greta Lindwall, Zi Kui Liu, Brian Gleeson

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Abstract

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.

Original languageEnglish (US)
Article number055001
JournalScience and Technology of Advanced Materials
Volume16
Issue number5
DOIs
StatePublished - Sep 21 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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