Isothermal Sections of Al-Ni-Zr Ternary System at 850 and 1050 °C

Abstract

Phase relations of Al-Ni-Zr ternary system were investigated with more than 60 ternary alloy compositions combining with x-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy and electron probe microanalysis. The isothermal section at 850°C for x(Al) < 75 at.% has been constructed. The existence of five 2-phase regions and twenty-six 3-phase regions has been confirmed. In contrast to early reported in literature, two 3-phase equilibria: c-(Ni) + Ni 5 Zr + c¢-AlNi 3 and Ni 5 Zr + Ni 7 Zr 2 + c¢ were determined. And a large solubility of Al in Ni 7 Zr 2 about 11.07 at.% was detected. Besides, the 1050°C isothermal section was determined at the Ni-rich corner, where an extended homogeneity of Ni 7 Zr 2 was observed. Differences of the equilibria in the Ni-rich corner obtained in the present work and appeared in literatures were further analyzed and discussed.

Characteristics, Thermodynamics, and Preparation of Nanocaged 12CaO·7Al2O3 and Its Derivatives

“…46,48 Some researchers believed that C12A7 may easily form a glass 24 which leads to its absence in C-A phase diagrams. 46,48 Based on experience of phase diagram study, [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94] some attempts were made to recalculate/ optimize C-A system from thermodynamic data of Brain 1989 95 (as listed in Table I).…”