摘要
The mechanical alloying of FeNiPB(Cu, Nb) mixed powders was studied by X-ray diffraction (XRD), transition electron microscope (TEM), scanning electron microscopy (SEM) and extended X-ray absorption fine structure (EXAFS). The results show that the FeNiPB(Cu, Nb) mixed powders alloy after milling for 20 h, as the milling time increases to 80h, Fe and Ni atoms are in an amorphous environment, the morphology of FeNiPB(Cu, Nb) mixed powders appears as cotton fiber and its electron diffraction pattern shows a typically diffuse amorphous halo. So FeNiPB(Cu, Nb) mixed powders transform to amorphous state under this condition. After the FeNiPB(Cu, Nb) amorphous alloy was heated at 520℃ for 1 h, the nanocrystalline FeNiPB(Cu, Nb) was produced. So, the Fe-based nanocrystalline alloy can be prepared by partially crystallizing the FeNiPB(Cu, Nb) amorphous alloy.
用X射线衍射分析仪 (XRD) ,透射电子显微镜 (TEM ) ,扫描电子显微镜 (SEM )和X射线吸收精细结构分析仪 (EXAFS)对机械合金化后的FeNiPB(Cu ,Nb)混合粉末进行了分析研究 .研究结果表明 :FeNiPB(Cu ,Nb)混合粉末球磨 2 0h后合金化 ,球磨 80h后FeNiPB(Cu ,Nb)混合粉末中的Fe ,Ni原子处于非晶环境中 ,粉末的形态为棉絮状 ,电子衍射为典型的非晶环 .XRD ,EXAFS ,TEM的分析结果表明在该条件下 ,FeNiPB(Cu ,Nb)混合粉末完全转变成了非晶 .FeNiPB(Cu ,Nb)非晶合金在 5 2 0 ℃ 加热 1h后产生纳米晶 ,所以纳米晶铁基合金可通过FeNiPB(Cu ,Nb)非晶合金部分晶化获得 .
