Effect of replacing Nb with (Mo and Zr) on glass forming ability, magnetic and mechanical properties of FeCoBSiNb bulk metallic glass

Evaluation of the Effect of Minor Additions in the Crystallization Path of [(Fe0.5Co0.5)0.75B0.2Si0.05]100-xMx Metallic Glasses by Means of Mössbauer Spectroscopy

“…All the spectra have been fitted with a single hyperfine magnetic field distribution except Zr4-T1 in which two individual ferromagnetic sextets, with hyperfine magnetic fields of 33 and 30 T, have been needed to obtain a good fit in addition to the hyperfine field distribution, now between 0 and 32 T. The two sextets can be assigned to an α-Fe phase and to Fe atoms in an α-Fe phase with a non-magnetic element as near-neighbor, probably at the interface between the crystal and the amorphous matrix. The presence of α-Fe as the primary crystallization product is in accordance with the XRD diffractograms of this alloy published by Ramasamy [33]. However, the changes in the short-range order of the annealed alloys can be clearly seen in the changes of the hyperfine field distribution.…”

“…The existence of a glass transition, although not clear in the Zr4 alloy, together with the main exothermic peak below 900 K demonstrate the amorphous character of the as produced ribbons. The crystallization behavior is, as expected, the same as the one observed in the same compositions produced as bulk metallic glasses [33]. The crystallization starts with a single exothermic peak followed by different less exothermic crystallization events.…”

“…Therefore, the different DSC trace of the Zr4 alloy shown in Figure 1 may be attributed to the crystallization of an additional phase without Fe, thus invisible to the Mössbauer spectroscopy. According to [33], this phase could be identified as ZrB 2 . One of the main advantages of Mössbauer spectroscopy is the ability to quantify the relative amount of Fe atoms in each phase at different stages of the crystallization process that is shown in Figure 6.…”

“…In these cases, to understand the effect of the minor additions on the stability of the amorphous structure and its crystallization route is fundamental for developing new alloys. Very recently, Ramasamy et al [33] studied the effect of replacing Nb with Mo and Zr in a FeCoBSiNb bulk metallic glass. In their study, it was shown that the GFA of the alloys decreases with the substitution and even hinders the production of a bulk amorphous structure in the case of Zr.…”

Fe73.5Si13.5B9Cu1Nb3 metallic glass: Rapid activation of peroxymonosulfate towards ultrafast Eosin Y degradation

“…Metallic glasses (MGs) have been extensively employed as either structural [1] or functional materials [2] in industries due to their superior physical and chemical properties such as high strength [3,4], excellent corrosion resistance [5,6], and soft magnetic properties [7,8]. However, the development of bulk metallic glasses (BMGs) still has many obstacles, such as the absence of plasticity [9].…”