【摘要】 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温度与低的塑性更多还原

【Abstract】 The effects of substitutional elements, Cr, Mn, Ti, Ni, Mo, on the tensile properties in vaccum, DO 3 transition temperature T c, degree of order in DO 3 state, APD and dislocation configuration of stoichiometric Fe 3Al based alloy with equiaxed grain have been investigated. The experimental results indicate that in comparison with binary Fe 3Al, the addition of Cr decreases the temperature T c and increases the tensile elongation, which is related with the decrease of interatomic energy and APB energy; other elements increase T c and decrease the ductility. Based on the site occupations of alloying elements, atomic dissociation energy and APB energy are also discussed.更多还原