Fe_(76-x)Hf_xY_4B_(20)(x(x)=2,4,6%)合金的热稳定性和磁性能

Thermal stability and magnetic property of Fe_(76-x)Hf_xY_4B_(20)(x(x)=2,4,6%)alloys

用单辊旋淬法制备Fe_(76-x)Hf_xY_4B_(20)(x(x)=2,4,6%)非晶合金,在不同温度下分别对合金进行等温退火处理,利用差热分析仪(DTA)、X射线衍射仪(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)研究合金的热稳定性、结构和磁性能。结果表明:Fe_(76-x)Hf_xY_4B_(20)(x(x)=2,4,6%)非晶合金的第一晶化峰值随着Hf含量的增多而增高,热稳定性得到增强;Fe_(76-x)Hf_xY_4B_(20)(x(x)=2,4,6%)合金退火后,先有α-Fe相析出,随退火温度升高,同时伴有Fe_2B和Fe_(23)B_6的析出,3种合金晶化过程相似;饱和磁化强度M_s值随退火温度升高呈稍有增大、减少、再增大的变化趋势,矫顽力H_c值基本上是随温度升高而增大。

Fe76-xHfxY4B20（x（x）=2,4,6%）amorphous ribbons were prepared by the single roller melt-spinning and were isothermally annealed at different temperature. Thermal properties,microstructures and magnetic properties of the samples were investigated by differential thermal analysis（DTA）,X-ray diffraction（XRD）,transmission electron microscopy（TEM）and vibrating sample magnetometer（VSM）,respectively. The results show that first crystallization peak value of Fe76-xHfxY4B20（x（x）=2,4,6%）amorphous alloy increases with the increase of Hf content,and the thermal stabilities of the alloy are enhanced.The α-Fe phase is precipitated from the amorphous matrix in their initial stage of crystallization process and then Fe2 B and Fe23B6 are precipitated with the increase of annealing temperature. The crystallization processes of Fe76-xHfxY4B20（x（x）=2,4,6%）amorphous alloy are similar. The Msof the alloys all increases firstly and then decreases,and increases finally with the increase of annealing temperature,and the Hcof the alloys all increases.