Aluminium – Molybdenum – Nickel

Abstract

Experimental investigations of the phase equilibria in the Al-Mo-Ni system were started by [1925Pfa] and [1933Roe] and, as summarized in [1976Mon], concerned the Ni-rich corner as well as the influence of additions of Mo and Ni on the Al solid solution, respectively. The investigations of the partial Ni-NiAl-Mo system were further developed by [1959Gua2, 1960Bag, 1965Ram, 1976Jac, 1977Aig, 1977Pea, 1978Gul, 1983Nas, 1983Wak, 1984Kov1, 1984Kov2, 1984Mir, 1985Nas, 1986Mas1, 1986Mas2, 1988Mas, 1989Mas, 1989Hon1, 1989Hon2, 1991Mis]. Results of phase equilibria studies for the Al-rich corner are presented by a series of isothermal sections [2002Gru]. The complete ternary system has been investigated experimentally at 600°C [1971Pry], 800°C [1969Mar] and 950°C [1969Vir]. For preparation of the alloys most of the authors used arc melting, while [1971Pry] and [2002Gru] applied levitation induction melting, and [1984Mir] obtained specimens by both conventional arc-casting and powder metallurgy techniques. The traditional methods of investigations were X-ray diffraction (XRD), metallography, differential thermal analysis (DTA), electron microprobe analysis (EMPA). Some authors used scanning electron microscopy (SEM) [1989Hon1, 1989Hon2, 1991Mis, 2002Gru], transmission electron microscopy (TEM) [2002Gru], as well as energy-dispersive X-ray spectroscopy (EDXS) [1991Mis]. Calculations of phase equilibria were carried out by [1974Kau, 1999Kau] and [1999Lu]. A critical review of literature data on phase equilibria in the Al-Mo-Ni system was presented in the assessment of [1993Kub]. Further experimental studies are necessary in order to construct the liquidus surface and the reaction scheme of the complete ternary system as well as isothermal sections in the whole range of compositions [1969Mar, 1969Vir, 1971Pry].