The Influence of Amorphous Alloys Composition on Kinetics of Crystallization with the Nanocrystalline Structure Formation

The effect of niobium alloying additions on the crystallization of a Fe–Si–B–Nb alloy

“…In the Fe-Si-B-Nb alloy, the activation energy is 421 kJ/mol for the single peak. This indicated that Nb alloying additions stabilized the amorphous matrix which is consistent with earlier reports [12,16,17]. Phase formation following primary crystallization for both alloys was identified from the XRD data and the results are shown in Figs.…”

“…Hence, in order to obtain a fundamental understanding of the individual effects of Cu and Nb alloying additions in Finemet alloy particular attention should be paid to the influence of separate additions of Cu and Nb to the reference Fe-Si-B alloy. For the Fe 74.5 Si 13.5 B 9 Nb 3 alloy earlier work has been carried out to study the thermal properties and phase formation [8][9][10][11][12][13][14]. However, due to the complex phases formed after crystallization in the Fe-Si-B-Nb alloy detailed microstructural observations and corresponding SADP analysis by TEM have not been reported so far.…”

Curie temperature behaviour at relaxation and nanocrystallization of Finemet alloys

“…It causes two well distinguished crystallization stages, i.e., the formation of ␣-Fe(Si) nanograins at the first stage and the formation of boride at the second one. There is a complicated change of final phase composition, resulting in the formation of Fe 3 B phase instead of Fe 2 B for parent ternary alloy [3,4]. Nevertheless, due to the presence of strong growth inhibiting element Nb, the partially crystallized Fe 73.5 Nb 3 Cu 1 Si 13.5 B 9 composition becomes very stable after the first crystallization stage, and that makes it possible to form reproducible amorphouscrystalline nanostructure with promising magnetic properties.…”

Curie temperature behaviour on annealing of Finemet type amorphous alloys

“…As T C is a very sensitive parameter, which reflects the local atomic structure of the amorphous phase, it can be used for monitoring the processes of relaxation, clustering and the onset of crystallization, as well as for estimation of the composition fluctuations in such clusters. It is known that Nb additions result in a decrease in T C for the amorphous phase at a up 25 K/at.% [7], whereas increasing the Si and B content in Fe-based amorphous alloys brings an increase in T C of the amorphous phase by approximately 14 K/at.% [8]. Based on these data and the plots of Figs.…”