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用中子衍射分析法研究了Ｃｒ，Ｍｏ，Ｔｉ，Ｎｉ，Ｍｎ，Ｓｉ等代位合金元素在当量成分，ＤＯ_３结构Ｆｅ_３Ａｌ金属间化合物亚点阵中的原子占位及其对单胞中Ｆｅ原子磁矩，ＤＯ_３→Ｂ２转变行为的影响．结果表明，Ｃｒ，Ｍｏ和Ｔｉ都占据Ａｌ原子的次近邻位置，替代Ｆｅ原子；Ｎｉ和Ｍｎ占据Ａｌ原子的最近邻位置；（Ｓｉ＋Ａｌ）当量成分以内的Ｓｉ原子替代占据Ａｌ原子的位置．合金元素的加入，不同程度地降低了ＤＯ_３结构Ｆｅ_３Ａｌ合金的有序度，并改变了单胞中两类Ｆｅ原子的磁矩
The atomic occupancy of Cr, Mo, Ti, Ni, Mn, Si and other alloying elements in sub-lattice of equivalent composition and DO_3 intermetallic compound of Fe_3Al and its effect on the atomic density of Fe atom Moment, DO_3 → B2 transitional behavior. The results show that Cr, Mo and Ti occupy the nearest neighbor of Al atoms instead of Fe atoms; Ni and Mn occupy the nearest neighbors of Al atoms; and Si atoms within the (Si + Al) equivalents take the place of Al atoms. The addition of alloying elements reduced the degree of ordering of DO_3 structure Fe_3Al alloy to some extent and changed the magnetic moment of two kinds of Fe atoms in the unit cell