Fe、Ce原子在Al-Fe-Ce非晶合金中的分布

The distribution of Fe and Ce atoms in Al-Fe-Ce amorphous alloys

采用X射线衍射技术研究了Al-Fe-Ce合金的非晶结构,发现非晶态合金X射线衍射强度曲线上都存在明显的预峰,合金随铁含量增加,预峰和主峰向大角度偏移;合金随铈含量增加,预峰和主峰向小角度偏移。250℃时,非晶合金出现铝相晶化,而预峰的形状和位置并未发生改变;400℃时,在预峰消失的位置形成多种化合物相。Fe原子大部分存在于预峰所对应的Al-Fe-Ce原子团簇中,而Ce原子大部分无规分布于Al非晶基体中。

The microstructures of the Al-Fe-Ce amorphous alloys have been studied by X-ray diffraction (XRD). The distinct prepeaks have been found on the X-ray diffraction intensity curves the amorphous alloys. The positions of the prepeak and the main peak shift to higher angle as the concentration of Fe increases, but the positions of the prepeak and the main peak shift to smaller angle as the concentration of Ce increases. At 250℃, the fcc-Al particles appear and the prepeak still exists; at 400℃, several compounds have been formed at the position of the prepeak. Most of Fe atoms exist in the Al-Fe-Ce clusters corresponding to the prepeak, and most of Ce atoms are randomly distributed in Al amorphous matrix.