喷射成形FINEMET合金Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9的研究  

Study of Spray Formed Finemet Alloy Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9

作　　者：董鹏[1] 严彪[1] 杨沙[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092

出　　处：《上海有色金属》2009年第1期12-15,共4页Shanghai Nonferrous Metals

基　　金：上海市科学技术发展基金(项目号:0752nm004)

摘　　要：用喷射成形法制备了Fe73.5Cu1Nb3Si13.5B9（at％）的铁基非晶合金，目的在于研究非晶相的形成机理及其在高速冷却条件下生成特定的微观结构。喷射成形气流中，G／M为0．15，雾化气体为氮气。所得到的沉积体和过喷粉末的粒径在5μm左右，总重约2．2kg。借助X射线衍射（XRD）、光学显微镜（OM）以及透射电镜（TEM）等分析方法研究了沉积体的微观组织结构。发现随着厚度的改变，其成分、结构也有所变化，体现在中心区域厚度15mm和边缘区域厚度8mm的孔隙率分别为4％和9％。中心较厚区域为晶粒尺寸250nm左右的完全晶化相，而边缘较薄区域则有部分非晶相，其晶粒尺寸在40nm。由XRD谱线分析，过喷粉末为完全晶化相，用谢利方程（Scherrer formula）分析得到其晶粒在80nm左右。通过VSM分析，其软磁性能很差，饱和磁感只有0．3～0．6T，同时矫顽力上升得很快。The captioned alloy was prepared by spray forming with the purpose of studying the forming mechanism of the amorphous alloy and its specific micro-structure when it is formed under the rapid cooling condition. In the gas jet, the ratio of G/M is 0.15 with the atomizing gas being nitrogen. The grain diameter of the deposit and the over-sprayed powder is 50 μm. Its weight totals 2.2 kg. The microstructure of the deposit was studied by means of XRD, OM and TEM. It is found that its composition and structure change with the change of the thickness. When the central area is 15 nun thick and the rim area 8 mm thick, the porosities are 4 % and 9 %, respectively. The thicker central area is a fully crystallized phase with a grain size of 250nm while the thinner rim area is partly an amorphous phase with a grain size of 40nm. Through the analysis of XRD, the over-sprayed powder is found out to be a fully crystallized phase. Through the analysis of Scherrer formula, its grain size is found out to be around 80 nm. Through the analysis of VSM, it is found that its soft magnetic property is very poor with saturated magnetic induction intensity ranging between 0.3T and 0.6T and meantime its coercive force increases very rapidly.

关 键 词：Finemet合金 喷射成形 软磁性能 纳米晶化 非晶 

分 类 号：TF124.39[冶金工程—粉末冶金]