Thermodynamic models of liquid multicomponent metallic solutions

Thermodynamic models for regular, pseudo-regular, subregular, and pseudosubregular metallic solutions are considered. It is shown that the transition from the excess Gibbs energy of a solution to the excess chemical potentials of the components in the subregular solution model leads to more complex dependences of the activity coefficients on the solution composition than those in the regular and pseudoregular solution models. Equations for the excess chemical potentials of components obtained by these models are presented for binary, ternary, and multicomponent solutions. The energy of mixing of components in binary solutions are calculated and estimated using experimental data obtained by various authors for the last half a century. The zero-order and first-order interaction parameters are estimated from the energy parameters for dilute solutions.     

Kinetics of formation of interparticle contacts in the laser sintering of single component metallic powders

The joining of two spherical particles of nickel alloy powder under the action of lager irradiation, and the lager sintering of thin layers of poured powder were investigated. It was determined that powder particles experience surface melting under the action of lager heating, and join by a welding mechanism Institute of Technical Acoustics, Belorussian Academy of Sciences, Vitebsk. Translated from Poroshkovaya Metallurgiya, Nos. 1–2, pp. 54–62, January–February, 1997.