The investigation of the structural relaxation of Fe40Ni40B20 metallic glass by thermal dilatation measurements

Evidence for Different Ferromagnetic Phases in Amorphous Fe40Ni40B20 Detected by EPR

“…T c increases continuously to about Ar c = 0.25 K for the highest annealing temperature of 530 K. The density exhibits a more step-like behaviour (Fig. 3) and changes by about 0.1% at 460 K. Although the experimental error in Q is rather large with respect to the small changes, but as the thermal dilatation experiments by Kursumovic et al [8] on the same material revealed a peculiar contraction at about 460 K, the step-like behaviour of g indeed is realistic. The most significant changes are seen in the relative strain at fracture (Figure 3).…”

“…Thermal dilatation measurements on Fe^Ni^E^o performed by Kursomovic et al [8] have revealed peculiar contractions of the ribbon at 460 and 570 K, as well as at the "final" Curie temperature of 662 K. The contractions at 460 and 570 K have been attributed by the authors as being due to thermallyinduced structural relaxation. Indeed the length change at 460 K coincides with the Curie temperature of the SFP.…”

“…Such a relaxation would alter the properties of the amorphous metal and thus might either conceal or produce a measureable effect. In the case of amorphous Fe 40 Ni 4 oB2o the effects of irreversible low temperature relaxations are well known [4,8]. Changes of some physical properties are shown in Figure 3.…”

Thermomechanical Behavior of Cu50Hf41.5Al8.5 Bulk Metallic Glass after Sustained Elastic Deformation

“…Several reports in the literature indicate an increase in the relative length change of a glass and thus an increase in the LTE coefficient at the transition from glass to supercooled liquid. [11,15,22,24,25,[30][31][32][33][34] The separation of the thermal expansion signal into reversible and nonreversible components allows for an assessment of the changes in the true thermal expansion coefficient and in particular an assessment of the true thermal expansion behavior in the supercooled liquid state. The reversible signals in Figure 3(a) show a strong increase in the LTE coefficient in the supercooled liquid state compared to the increase in the LTE coefficient with temperature below the glass transition.…”

“…Thermomechanical analysis (TMA) has been used successfully in the past to detect mainly structural relaxation and crystallization in metallic glasses. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] The TMA reveals length changes of samples with changes in temperature. Upon modulating the temperature, the reversible length changes can be separated from the nonreversible changes that include structural relaxation, viscous effects, or crystallization, depending on the time-temperature condition of the measurements.…”