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本文叙述了利用电子显微镜对含10％Si和5％Al的Fe-Si-Al高导磁合金薄膜进行的结构研究。发现了基体为有序面心立方Fe3(Al,Si)结构,其晶格参数为5.70±0.03?,该值在Fe3Si和Fe3Al晶格参数之间,说明部分Si原子为Al原子所置换。并获得三套基体和析出相合成的电子衍射图,相应确定了基体和析出相的取向关系:(001)基‖(110)相;[100]基‖[00I]相;[010]基‖[I10]相。对析出相的萃取碳复型,在电子显微镜中进行选区衍射,获得了立方Fe3(Al,Si)Cx相的结构。提出:Fe原子占据面心;Al或Si原子占据顶角;C原子占据体心的看法。The structure of the high magnetic permeability Pe-Si-Al alloy containing about 10 percent Al and 5 percent Si has been investigated. By using the foil specimen technique of electron microscope, the structure of matrix was found as ordered fcc Fe3(Al, Si) phase, its lattice parameter being 5.70±0.03?. This value lies between the values of the lattice parameter of Fe3Si and Fe3Al. This explains that a proportion of the silicon atoms is replaced by the aluminium atoms. Three sets of electron diffraction patterns of the matrix combined with the precipitated phase were obtained and their orientation relationships determined.The carbon replica of the extracted precipitated phase in selected regions is diffracted by contrast in the electron microscope. The Fe3(Al, Sl) Cx phase is a cubie structure. It might be suggested that the Fe atoms occupy the positions of face centres, Al(Si) atoms occupy the cube corners, and the carbon atoms occupy the body centres.
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