摘要
采用X射线衍射(XRD)和高分辨透射电镜(HRTEM)对Al-Fe-Ce非晶合金的局域结构进行了研究,分析了二十面体短程序对非晶合金的形成及热稳定性的影响。Al-Fe-Ce非晶合金中的二十面体短程序均匀弥散分布在非晶基体中,Al颗粒被二十面体化学短程序紧紧包围,二十面体化学短程序阻碍了Al颗粒的长大,面心立方铝(fcc-Al)的形核需要二十面体结构的分解及溶于其中的元素的扩散。二十面体结构单元的存在和均匀分布有利于增强非晶合金的玻璃形成能力和非晶相的热稳定性。
The local structure of the amorphous Al-Fe- Ce alloys was studied by X-ray diffraction （XRD） and high resolution transmission electron microscopy （HR- TEM） to determine the relationship among icosahedral short-range ordering, glass formability and thermal stability of the amorphous phase. The structure of the Al-Fe-Ce alloys consisted of icosabedral chemical ordering homogenously distributed in the amorphous matrix. The strong interaction between Al and Fe made the icosahedral short-range order very stable. The nanoscale fcc-Al particles were surrounded by icosahedral short-range order. It could be concluded that the grain growth of the fcc-Al needed the decomposition of the icosahedral short-range order and the redistribution of the solute elements. The enhanced formability and stability of the amorphous phase were attributed to the presence and homogeneous distribution of icosahedral structure units.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2009年第2期257-261,共5页
Journal of the Chinese Society of Rare Earths
基金
山东省自然科学基金资助项目(Y2006B25)
