Effect of minor additions on the glass forming ability and magnetic properties of Fe–Nb–B based metallic glasses

TitleEffect of minor additions on the glass forming ability and magnetic properties of Fe–Nb–B based metallic glasses
Publication TypeJournal Article
Year of Publication2010
AuthorsTorrens-Serra, J, Bruna, P, Rodriguez-Viejo, J, Roth, S, Clavaguera-Mora, MT
JournalIntermetallics
Volume18
Start Page773
Issue5
KeywordsB. Glasses, B. Magnetic properties, B. Phase transformation, C. Rapid solidification processing, F. Calorimetry, metallic
Abstract

The glass forming ability, thermal stability, nanocrystallization, and magnetic properties of Fe65+xNb10B25−x (x = 0,5,10), Fe75+yNb9−yB15Cu1 (y = 0,2,4) and Fe77−zCozNb7B15Cu1 (z = 2,4,8) metallic glasses have been studied. The results show differences in the nanocrystallization changing from the metastable Fe23B6 phase to bcc-Fe when increasing the relative Fe/B content. The ternary FeNbB alloys are good soft magnets in the glassy state and glass forming ability is enhanced with the B content. However, their nanocrystallization leads to large increase of coercivity. The (Fe,Co)–Nb–B–Cu alloys show bcc-Fe or bcc-(Fe,Co) grains with a refined microstructure (4–6 nm) after nanocrystallization with relatively low coercivity values (in the range 4–15 A/m). The replacement of Nb by Fe and the addition of Co enhance the values of both the Curie temperature and saturation polarization from 346 K to 493 K (for Fe69Co8Nb7B15Cu1) and from 1.0 T to 1.4 T (for Fe79Nb5B15Cu1), respectively.

URLhttp://dx.doi.org/10.1016/j.intermet.2009.12.006
DOI10.1016/j.intermet.2009.12.006
Short TitleIntermetallics 18 (2010), 773-780
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