ANALYSIS OF ATOMIC DIFFUSION IN LIQUID-METALS AT MELTING TEMPERATURESIN CAPILLARY-LIKE MEDIA

This is the second of two articles dealing with atomic transport in li quid metals in capillary-like media such as fine pores or grain bounda ries with thicknesses above some critical value. Our previous studies analyzed the relationship between diffusivity and viscosity of liquid metals in capillary [J. W. Nowok, Scripta metall. mater. 29, 931 (1993 )]. A primary purpose of this article is to discuss an accuracy of cal culating self-diffusion coefficients using known bulk properties of li quid metals such as viscosity, surface tension data fundamental physic al properties of liquid behavior in capillary. The lack of accuracy of surface tension data causes errors in the calculation of diffusion co efficients. Also, the predominant influence on D appears to be the mol ar (molecular) volume of liquid metals. This results from changes in t he attractive portion of the effective potential between atoms for liq uids with low molecular volumes.