Crystallization behaviour of Metglas 2826 MB (Fe40Ni38Mo4B18)

Abstract

Differential scanning calorimetry, x-ray diffraction and transmission electron microscopy have been employed to determine the thermal stability and identify the crystalline phases on devitrification of Metglas 2826 MB. The glass crystallizes into "f-FeNiMo and fcc (FeNi)zaBo with activation energies of 270 and 375 kJ tool-1 respectively. The reactions are primary and polymorphic in nature. The influence of Mo towards crystallization of FegoNi4oB2o has been to enhance the formation of the fcc (FeNi)2aB6 phase in preference to orthorhombic (FeNi)3 B phase and to raise the thermal stability of the amorphous state.

A study on microstructure, magnetic properties and kinetics of the nanocrystallization of Fe40Ni38B18Mo4 metglass

“…However, in the case of MS1 this difference was slightly higher. The E value of MS2 was also in good agreement with the reported values in literature [19,20]. The E value for MS1 obtained by Kissinger approach was in close agreement with those obtained by Kurajica et al [21] and Antonione et al [17].…”

“…The E value for MS1 obtained by Kissinger approach was in close agreement with those obtained by Kurajica et al [21] and Antonione et al [17]. The activation energy for MS1 and MS2 reported in literature [17][18][19][20][21][22] has been presented in Table 4. It can be seen from this table that there was a large scatter in the E values determined by different approaches for both MS1 and MS2 and these were ranging from 280 to 451 kJ/mol for MS1 and from 270 to 403 kJ/mol for MS2.…”

Effect of thermal annealing on Fe40Ni38B18Mo4thin films: modified Herzer model for magnetic evolution

“…This contributes substantially to the magnetic properties of the sample. The second DSC exotherm corresponds to the crystallization of the residual amorphous phase and the precipitation of FeNiMo 23 B 6 [14]. For bulk ribbons, the crystallization temperatures associated with the phases are 699 K for the first phase and 809 K for the second phase for a heating rate of 15 K min −1 .…”

On the crystallization kinetics and micro-structural transformations of Fe40Ni38B18Mo4 alloys

“…Further, it is evident that the first crystallization step extends up to the initial stage of the second crystallization with progressive grain growth of the initially nucleated crystallites. The initial crystalline phase is responsible for the superlative magnetic properties exhibited by metglas [19]. The second DSC exotherm corresponds to crystallization of the residual amorphous phase and the precipitation of FeNiMo 23 B 6 [19].…”

“…The initial crystalline phase is responsible for the superlative magnetic properties exhibited by metglas [19]. The second DSC exotherm corresponds to crystallization of the residual amorphous phase and the precipitation of FeNiMo 23 B 6 [19]. The crystallization temperatures associated with the two phases are 699 K and 809 K correspondingly for a heating rate of 15 K/min.…”