研究了Ｃｒ、Ｍｏ、Ｔｉ、Ｎｉ、Ｍｎ、Ｓｉ等代位合金元素对当量成分、ＤＯ３结构等轴晶Ｆｅ３Ａｌ合金真空拉伸性能、ＤＯ３转变温度Ｔｃ、ＤＯ３有序度、位错反相畴、位错组态等的影响，从合金元素原子在Ｆｅ３Ａｌ单胞亚点阵占位、原子解离能、反相畴界能等方面进行了初步探讨。结果表明，与Ｆｅ３Ａｌ相比，Ｃｒ的添加降低合金的Ｔｃ温度、提高真空拉伸延伸率，与ＣｒＡｌ原子对交互作用能、反相畴界能的降低有关；其它三元合金都表现高的Ｔｃ温度与低的塑性 The effects of substitutional alloying elements such as Cr, Mo, Ti, Ni, Mn and Si on the vacuum tensile properties, DO3 transformation temperature Tc, DO3 ordering, dislocation inversion domains, The effects of misconfiguration and so on are discussed preliminarily in the aspects of the subatomic lattice of Fe3Al single cells, the dissociation energy of atoms and the anti-phase boundary energy of alloying elements. The results show that, compared with Fe3Al, the addition of Cr reduces the Tc temperature of the alloy and increases the tensile elongation in vacuum, which is related to the reduction of the interaction energy and the anti-domain boundary energy of the CrAl atom. Other ternary alloys all show high Tc temperature and low plasticity