Effect of quenched-in nuclei on the crystallisation kinetics of metallic glasses

Preparation of Fe-based monodisperse spherical particles with fully glassy phase

“…Thus, the atomic configuration in melt is supposed to reflect that after solidification [15,16]. Furthermore, the crystalline phase appearance was supposed to start from particular atomic bindings in the melt, such as quenched nuclei, intermetallic compound, and so on [24,25]. However, the previous reports have suggested that the atomic configuration including the atomic bindings changed with the degree of superheating [26][27][28].…”

“…If so, the higher initial temperature brings a more random atomic configuration, and as a result reduces R c . On the other hand, in the lower initial temperature, more atomic bindings would exist as written before [24,25]. The atom configuration in the largely overheated melt is more random [26][27][28].…”

“…On the contrary, if the overheating is not large, a certain kind of atom binding easily remains in the melts. These bindings originate at latent nucleation sites for solidification [24,25]. It means, the change in R c at the initial temperature could be explained by considering the atomic configuration.…”

Effects of chemical composition on nanocrystallization kinetics, microstructure and magnetic properties of finemet-type amorphous alloys

“…An increase of E(α) with α is seen for low α values, which corresponds to the initial stage of crystallization (mainly nucleation). It is worth to note that the presence of quenched-in nuclei in the amorphous precursor, due to limited cooling rate during glass formation, reduces the activation energy at the beginning of the phase transformation [41][42]. The different apparent activation energies assessed for the two alloys can be explained by the difference between the crystallization temperature (T p ) and the Cu clustering temperature (T clust ).…”