Fe_（85）Zr_9B_6和Fe_（84）Zr_9B_6Cu_1非晶合金形成纳

FORMATION MECHANISM FOR NANOCRYSTALLINE FROM AMORPHOUS Fe_(85)Zr_9B_6 AND Fe_(84)Zr_9B_6Cu_1 ALLOYS

本文利用透射电子显微学和能谱分析技术研究了ＦｅＺｒＢ（Ｃｕ）非晶合金在动态升温过程中和不同热处理温度下微观结构的变化．研究发现，在合金晶化过程中，非晶相由富Ｚｒ和富Ｆｅ区组成．富Ｚｒ相对ｂｃｃＦｅ相的析出和稳定性有着重要的影响．α－Ｚｒ相的析出是ｂｃｃＦｅ相开始失稳长大的标志．

The microstructure changes in the nanocrystalline soft magnetic material of FeZrB(Cu) alloys with different temperatures of heat treatment and dynamic heating-up processes have been investigated by using TEM and EDAX. It has been found that there appears appreciable phase separation before crystallization. In amorphous phase there are Zr-rich and Fe-rich regions. The Zr-rich phase has a very important effect on precipitation and stability of bcc Fe phase, and the obvious precipitation of α-Zr phase indictates the beginning of instable growth for bcc Fe phase. It has been confirmed that the phase separation of FeZrB(Cu) alloys is a spinodal decomposition process