作　　者： ; ; ; ;

机构地区： 东莞理工学院机械工程学院

出　　处： 《材料热处理学报》 2015年第2期5-9,共5页

摘　　要： 采用单辊急冷法制备了(Fe0.58Co0.42)73Cr17Zr10非晶薄带,并对该合金进行等温退火。用XRD、AFM、VSM研究退火温度对(Fe0.58Co0.42)73Cr17Zr10非晶合金的组织结构和磁性能的影响。结果表明:该合金晶化析出过程为:Am→α-Fe(Co)+Am'→α-Fe(Co)+Cr Fe4+Fe3Ni2+Cr2Zr+未知相。500℃和610℃退火后薄带表面的AFM观察表明:AFM图片所呈现的颗粒尺寸要比用Scherrer法测得的α-Fe(Co)纳米晶尺寸大得多,这是典型的包裹晶粒现象。在低于晶化峰值温度(Tp)退火,由于铁磁性α-Fe(Co)相的析出,合金的饱和磁化强度Ms随退火温度的升高大幅上升;当退火温度高于Tp时,由于α-Fe(Co)相的粗化和析出相的析出和长大,Ms急剧下降,在635℃退火能获得最好磁性能,其Ms=126.2 emu/g。 ( Fe0. 58Co0. 42)73Cr17Zr10amorphous ribbons were prepared by melt-spinning method and annealed at different temperatures.Effects of annealing temperature on microstructure and magnetic properties of the( Fe0. 58Co0. 42)73Cr17Zr10amorphous ribbons were studied by X-ray diffraction,atomic force microscopy and vibrating sample magnetometer. The results show that the crystallization process of this alloy is Am → α-Fe( Co) + Am' →α-Fe( Co) + Cr Fe4+ Fe3Ni2+ Cr2 Zr + unidentified phase. The results of AFM observation show that in the annealed amorphous ribbons the grain size measured from AFM images is much larger than that of the α-Fe( Co) nanocrystal size caculated by Scherrer method,which is a typical phenomenon of coated grain. Annealed at temperatures below the crystallization peak temperature( Tp),the value of saturation magnetization( Ms) significantly increases due to the partial crystallization of amorphous precursors to create a homogeneous distribution of α-Fe( Co) nanocrystals within a residual amorphous matrix. Annealed at temperatures above Tp,the value of Msdrops rapidly,which may be caused by the grain growth and the formation of paramagnetic phase. When annealed at 635 ℃,the best magnetic property is obtained( Ms= 126. 2 emu / g).

关 键 词： 非晶合金 等温热处理 组织结构 磁性能

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]