Melt viscosity of nanocrystalline alloys in the model of free volume

In this paper we investigated the viscosity and density of melts Fe73.5Cu1M3Si13,5B9 where M = Nb, Mo, V, Cr. It is shown that the lowest viscosity and activation energy of viscous flow has a melt with Nb, whose atomic radius is the largest. It is shown that the free volume of the melt is higher during cooling compared to heating, and it indicates irreversible structural changes in the melt. The critical temperature Tk = 1770 K is found, above which the activation energy of the viscous flow changes.