Sm2Fe17快淬薄带相的组成与微观形貌的综合分析

The synthesize research of phases and morphology of Sm2Fe17 melt-spun ribbon

摘要:

通过x射线衍射(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)和透射电子显微镜(HRTEM)等测试手段，研究了淬火速度对Sm-Fe合金带相组成和形貌的影响。结果表明，随着淬火速度的增加，合金带的尺寸先沿宽度方向和厚度方向减小，然后厚度方向尺寸保持稳定。自由面晶粒团聚程度降低，当辊速为36m/s时，团聚尺寸为0.5~3μm。XRD、EDS结果表明,薄带主要由三种相组成，:Sm2Fe17,α-Fe 富Sm相，薄带的主相晶粒尺寸在亚微米尺度(dave≈340nm,36m/s)，限制因素主要是辊速和组成元素自身原因。但本文首次采用了不同的方法对晶粒形貌进行了表征。

Abstract:

The effects of the quenching speed on the phase composition and morphology of the Sm-Fe alloy ribbons are measured and analyzed by X-ray diffraction (XRD), optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (HRTEM). It was found that the size of alloy ribbons decrease along the width and thickness direction firstly with the increasing of quenching speed and maintain stability in the thickness direction even increasing the speed sequentially. The size of agglomeration also decreases in the free surface,about 0.5~3μm as the quenching speed is up to 36m/s. The XRD and EDS results show that there are three different phases in the ribbons: Sm₂Fe₁₇, α-Fe and Sm-rich phase,the main phase grain size of the ribbons is on the sub-micron scale (d^_aver≈340nm, 36m/s), which is restricted not only by the wheel speed but also by the bare two element type. It is the first time to characterize the grain morphology by different methods.