Fe-Nd-B-Zr块体非晶合金的形成能力和磁性能  

Glass Forming Ability and Magnetic Properties of Fe-Nd-B-Zr Bulk Metallic Glasses

作　　者：刘繁茂[1] 张慧燕[1] 张涛[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《材料工程》2014年第10期6-10,共5页Journal of Materials Engineering

摘　　要：以Fe-Nd-B系块体非晶合金为前驱体制备永磁材料。在Fe70Nd10B20三元合金及其邻近成分点中微量添加Zr元素,采用熔体旋淬法和铜模喷注法制备样品,通过XRD和DSC表征非晶形成能力。对Fe70Nd9B20Zr1块体非晶合金进行退火晶化处理,采用XRD分析晶化产物,通过VSM表征不同晶化阶段的磁性能。结果表明,合金体系的非晶形成能力得到提高,在Zr原子分数为1%时获得临界尺寸为2mm的块体非晶合金;Fe70Nd9B20Zr1块体非晶合金在946K,600s退火时得到最佳硬磁性能,剩磁(Br)、内禀矫顽力(iHc)和最大磁能积(BH)max分别为0.54T,348kA/m和24.1kJ/m3。该合金体系可应用于直接通过铸造和热处理工艺制备块体纳米复合永磁材料。Permanent magnets with Fe-Nd-B bulk metallic glasses as precursors was fabricated. Trace zirconium was added into FeT0 Ndl0 B20 ternary alloy and its adjacent composition. The samples were prepared by spin quenching and copper mold casting, and the glass forming ability was characterized by XRD and DSC. Then the FeT0 Nd9 B20 Zrl bulk metallic glasses were crystallized by annealing treatment. The crystallization phases were analyzed by XRD and the magnetic properties in various crystallization stages were characterized by VSM. The results show that the glass forming ability of the alloys is enhanced, and Fe-Nd-B-Zr bulk metallic glasses with critical diameter of 2mm are obtained in alloys con- taining 1% atom fraction Zr. The optimum hard magnetic properties of FeT0 Nd9B20 Zrl bulk metallic glasses can be achieved after annealing at 946K for 600s. The remanence （Br）, coercive field （iHc） and maximum energy product （BH）max are 0.54 T, 348kA/m and 24.lkJ/m3 , respectively. This alloy system can be applied to directly synthesize nanocomposite permanent magnets by the process of casting and subsequent crystallization.

关 键 词：铁基块体非晶合金 非晶形成能力 纳米复合永磁材料 硬磁性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]