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

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    AlCoCrNi-2016Gheno.TDB (57.76Kb)
    Author
    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 – equilibrium, and good agreement for three-phase – – and – – equilibria. An extensive comparison with existing Ni-base databases (TCNI6, TTNI8, NIST) is presented in terms of phase compositions.
    This item URI
    http://hdl.handle.net/11256/740
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