Sm2Fe17快淬薄带形貌及相组成的分析研究

Research on Phases and Morphology of Sm2Fe17 Melt-Spun Ribbon

采用X射线衍射(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)和高分辨率透射电子显微镜(HRTEM)分析了快淬速度对Sm-Fe合金带相组成和形貌的影响,并结合了3种不同的方法对Sm2Fe17薄带及微观组织进行了表征。结果表明:随着辊速的增加,合金薄带的尺寸在宽度和厚度方向上逐渐减小,当速度连续增加时,合金带的尺寸在厚度方向上趋于稳定。当辊速提高到36 m/s时,薄带自由表面中团聚体态颗粒尺寸减小,为0.5~3μm。XRD和EDS结果均表明,薄带中存在3种相分别为:Sm2Fe17、α-Fe相和富Sm相。Sm2Fe17相的晶粒尺寸为亚微米级(dm≈340nm,36m/s),这是辊速与元素种类共同限制的结果。

The effects of the quenching speed on the phase composition and morphology of the Sm-Fe alloy ribbons were analyzed by X-ray diffraction(XRD),optical microscope(OM),scanning electron microscope(SEM)and high-resolution transmission electron microscope(HRTEM).With the increase of wheel speed,the size of alloy ribbons decreased along the width and thickness direction firstly,and that existed stably in the thickness direction even when the speed increased sequentially.The size of agglomeration decreased in the free surface,which was 0.5~3μm when the quenching speed was increased up to 36 m/s.The XRD and EDS results show that there are three different phases in the ribbons:Sm2Fe17,α-Fe and Sm-rich phase.The grain size of Sm2Fe17 phase in the ribbons is on the sub-micron scale(dm≈340 nm,36 m/s),which is restricted not only by the wheel speed but also by the bare number of elements.