The effect of structural matching of crystalline lattices in the formation of nanocrystals in the amorphous phase

Abstract

The dependence of nanocrystal formation in the amorphous phase on the crystal structure of alloying components is studied. The formation of α-phase nanocrystals was found to depend on the concentration of alloying elements with the bcc lattice, and in some cases, the presence of two elements with this structure is necessary. The fraction of the nanocrystalline phase depends on the chemical composition of the alloy. It is found that in the alloys studied, at least 7 at.% Fe and more than 1 at% Nb are necessary for the formation of bcc nanocrystals. When niobium is replaced with titanium, the formation of the bcc phase is possible only at high Fe content. The formation of nanocrystals with the bcc lattice can depend on both the presence of a component with the same lattice and the presence of an element that contributes to the expansion of the region of α phase existence in the phase equilibrium diagram.