Molecular Dynamics Study of Mass Transport Properties of Liquid Cu-Ag Alloys

In this study, mass transport properties of liquid Cu-Ag alloys are investigated over wide temperature and composition ranges. The calculations are performed within the framework of the Green-Kubo (GK) formalism by using equilibrium molecular dynamics (MD) simulations along with one of the most reliable embedded-atom method potentials for this system developed by [P. Williams et al.: Modell. Simul. Mater. Sci. Eng. vol. 14 (2006), p. 817]. The approach employed allows for evaluation of the components’ self-diffusion coefficients as well as the phenomenological coefficient for mass transport Lcc. The results obtained in this study can be used to predict the kinetics of solidification of real liquid Cu-Ag alloys.

Influence of Adsorption upon Sound Attenuation in a Tube *

flu e n c e o f A d s o r p tio n u p o n S o u n d A t te n u a tio n in a T u b e * Sound waves propagating in a tube filled with gas are attenuated because of absorption in bulk, because of viscothermal effects, and possibly because the gas is adsorbed upon the wall. The latter effect is shown to depend upon a thermal relaxation time, the near-equilibrium desorption rate, and a phenomenological coefficient containing the sticking probability. In case of multilayer adsorption, especially upon metals, this data could be deduced from measurements of sound attenuation. An early experiment by Maurer is discussed in this light.