Experimental studies and thermodynamic optimization of the Ni-Bi system

摘要: Experimental studies by electron microprobe analyses, optical microscopy, and differential scanning calorimetry were performed. New data about the liquidus in central Bi-rich regions obtained. A narrow homogeneity region (about 50–52 at.% Bi) was found for compound NiBi while second intermediate phase this system (NiBi3) stoichiometric. Thermodynamic optimization of Ni-Bi diagram achieved CALPHAD method combining thermodynamic data. Thus, modeled with two sublattices, allowing mixing Bi Ni on one them only. The intermetallic NiBi3 as a stoichiometric compound. Redlich-Kister polynomials used to describe excess Gibbs energies solution phases (liquid, pure bismuth, Ni-based solid solutions).