Influencing the crystallization of Fe80Nb10B10 metallic glass by ball milling

Year: 
2017
Month: 
7
Day: 
18
Pages: 
227-236
DOI: 
10.1016/j.jallcom.2017.07.160
Author(s): 
Type: 
Journal Articles
Journal: 
Journal of Alloys and Compounds
Volume: 
725
Abstract: 

Melt-spun amorphous Fe80Nb10B10 ribbons were subjected to ball milling for different periods. The results show that ball milling not only induces the formation of nano-crystalline a-Fe during milling, but also drastically changes the crystallization behavior of the residual amorphous phase. In contrast to the as-spun ribbon, which crystallizes during heating through the formation of the metastable Nb5Fe33B10 phase and subsequent decomposition into stable a-Fe and a small fraction of Fe2B and NbFeB, ball milling progressively suppresses the formation of Nb5Fe33B10 as primary crystallization product and promotes the formation of a-Fe at low temperatures. The ball-milled nano-crystalline/amorphous powders have a saturation magnetization 2.5e3 times higher than the as-quenched amorphous ribbon along with Curie temperature increase by about 70 K with respect to the parent as-spun material. The structure and related magnetic properties of the milled material do not significantly change in the bulk samples synthesized by powder consolidation at temperatures up to ~900 K, which indicates that the stable nature of a-Fe makes this nano-crystalline/amorphous composite material potentially suitable for a wide range of high temperature applications.