用Mossbauer谱研究Nb对Fe基超微晶软磁合金显微结构的影响

INFLUENCE OF Nb ON THE MICROSTRUCTURE OF F_(e76.5-x) C_(u1)Nb_(x) Si_(13.5)B_9 NANOCRYSTALLINE STUDIED BY M■SSBAUER SPECTROCOPY

测量制备态和退火态的Ｆｅ７６．５－ｘＣｕ１ＮｂｘＳｉ１３．５Ｂ９（Ｘ＝０、１０、３０、５．２、７．２）合金Ｍｏｓｓｂａｕｅｒ谱结果表明晶化后Ｎｂ、Ｂ等元素向晶界区扩散，在残余非晶中形成了富Ｎｂ、Ｂ区和贫Ｎｂ、Ｂ区Ｎｂ抑制非晶相的晶化和ＦＣ２Ｂ相的析出。

The Mossbauer spectra were measured for amorphous Fe76. 5-x. Cu1 Nb.Si13. 5 B9 (x=0.0、1. 0、3.0、 5.2、7.2) alloys both at as-cast and annealed state, in order to investigate the influence of Nb on the formation of nanocrystalline alloy. The results indicate that upon crystallization, Nb and B immigrate into the grain boundaries. Two regions, enriched in Nb, B and poor in Nb, B, respeCtively, are formed in the residual amorphous phase. It is found that the addition of Nb impedes the crystallization of the amorphous phase and the precipitation of Fe2B phase. The influence on the magnetic texture of samples is also investigated.