Fe_(60)Ni_(40)纳米材料的结构相变  

Structure transformations of Fe_(60)Ni_(40) nanocrystalline materials

作　　者：卞清[1] 王晓[1] 张明[1] 郝绿原[2] 

机构地区：[1]解放军理工大学理学院,江苏南京211101 [2]中国科学技术大学国家同步辐射实验室,安徽合肥230029

出　　处：《解放军理工大学学报（自然科学版）》2006年第2期141-144,共4页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10264077)

摘　　要：采用机械合金化技术制备了系列Fe60Ni40样品,用XRD（X-ray diffraction）和SEM（scanning electronmicrosope）方法,分析了Fe-Ni合金在形成纳米状态过程中的物相变化,并用光谱分析测量了样品中的杂质含量.结果表明：球磨2 h,样品仍然保持Fe、Ni元素各自的晶体结构,但X射线衍射峰强度明显降低、宽度增加;球磨8～20 h,bcc结构α-Fe的特征峰基本消失,只有fcc结构Ni的衍射峰清晰可辨,表明已形成Fe-Ni固溶合金,粒度达到纳米级,说明机械合金化是制备纳米材料的有效方法;球磨40～100 h,Ni的特征峰与球磨8～20 h相比向高角方向移动了0.5°～0.7°,并且在衍射角2θ为64.8°和82.0°附近出现了类似α-Fe的（200）和（211）晶面衍射峰.通过分析计算发现,除了球磨介质污染,fcc结构的Fe-Ni合金又发生了新的结构相变.A series of Fe60Ni40 alloy were prepared by mechanical alloying （MA）. The phase transformations of samples were investigated by XRD and SEM during milling, and impurity quantity in the samples was surveyed by the spectral analysis method. The result showed that after milling for 2h the patterns with bcc-like structure of a-Fe and with fcc-like structure of Ni were observed, the diffraction peak intensity obviously reduced, and the breadths of diffraction peak increased. After milling for 8-20 h, patterns with bcc like structure of α-Fe disappeared, only the patterns with fcc-like structure of Ni were observed, and the SEM pattern showed that the grain size was about 20 nm. These results demonstrate that the MA Fe60Ni40 （8-20 h） alloy is a homogenous solid solution and MA is an outstanding method for preparing nanometer material. After milling for 40-100 h, compared with milling for 8-20 h, the diffraction peak of Ni moved 0.5°-0. 7° to the high angle direction, and some diffraction peaks which were similar to the peaks of a Fe appeared near the diffraction angle 64. 80° and 82.0°. By computing, it is found that after milling 40h new phase transformation has taken place besides the pollution of milling balls

关 键 词：X射线衍射分析 扫描电镜 机械合金化 

分 类 号：TM271.3[一般工业技术—材料科学与工程]