NANOCRYSTALLINE STRUCTURAL EVOLUTION IN Fe_90Zr_7B_3 SOFT MAGNETIC MATERIAL

摘要

Primary crystallization process of an Fe_90Zr_7B_3 amorphous alloy has been studied by atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). It is confirmed that two phases coexist at the stage with optimum magnetic properties, one is the α-Fe phase and the other is the amorphous phase enriched with Zr and B. Zr is almost completely rejected from the α-Fe phase, but some amount of B remains dissolved in the α-Fe phase. The as-quenched alloy is amorphous possibly with the median range order (MRO) structure. Unlike previously published results, no evidence for compositional decomposition prior to the crystallization reaction was found.