Primary crystallization in rapidly solidified Zr70Cu20Ni10 alloy from a supercooled liquid region

Effect of preannealing on glass transition and crystallization of gas atomized Cu47Ti33Zr11Ni8Si1 metallic glass powders

“…Hence, T x is closely linked with the nucleation process and the peak temperature is more related to the growth process. It was shown that the activation energy calculated from the onset temperature of crystallization E x represents the activation energy for nucleation, E n , and the activation energy calculated from the crystallization peak temperatures E p1 and E p2 resemble the activation energies for growth, E g [34]. From our results it is clear that for alloy A the E x and E p1 values are nearly identical.…”

“…It was reported earlier that the onset temperature of crystallization of an amorphous alloy refers to the temperature where the crystals begin to precipitate from the amorphous matrix, while the peak temperature corresponds to the stage where the crystals begin to collide each other [34][35][36]. Hence, T x is closely linked with the nucleation process and the peak temperature is more related to the growth process.…”

Phase Stability and Transformations in the Zr2Ni x Cu1−x Amorphous System

“…[30] Most of the work in the ternary amorphous system involved Zr 70 (Cu,Ni) 30 . [33][34][35][36][37][38][39] This alloy sits in a ternary phase field [12] and, therefore, the devitrifcation products may not be directly comparable to our study. However, the work by Wang et al consistently report on the formation of the ''big cube'' phase, a large fcc unit cell based on the Ti 2 Ni-type structure (O 5 h ), which is most likely the same phase reported by Bauer et al [30] Altounian et al noted that the large unit cell fcc phase formed only in the presence of oxygen and other impurities.…”

Nanocrystallization kinetics of Ni-based bulk amorphous alloy

“…The apparent activation energies of the ribbon samples are 441 kJ/mol for T x and 470 kJ/mol for T p : It is known that the onset crystallization temperature associated with the nucleation process, and the peak temperature is related to the growth process. It may presume that the activation energies deduced from onset crystallization and crystallization peak temperatures, respectively, represent the activation energy for nucleation and growth [14]. The approximate value of nucleation activation energy (441 kJ/mol) for the ribbons is little smaller than that of bulk samples (448 kJ/mol), indicating that the nucleation process for ribbon samples is easier than that of bulk samples.…”