(北京科技大学材料系，北京100083)
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。
关键字: Fe3Al 亚点阵 位错反相畴界 有序无序转变 塑性
MICROSTRUCTURE AND DUCTILITY OF Fe3Al
INTERMETALLICS
（University of Science and Technology Beijing, Beijing100083）
Abstract:The effects of substitutional elements, Cr, Mn, Ti, Ni, Mo, on the tensile properties in vaccum,DO3 transition temperatureTc, degree of order inDO3state, APD and dislocation configuration of stoichiometric Fe3Al based alloy with equiaxed grain have been investigated. The experimental results indicate that in comparison with binary Fe3Al, the addition of Cr decreases the temperatureTc and increases the tensile elongation, which is related with the decrease of interatomic energy and APB energy; other elements increaseTc and decrease the ductility. Based on the site occupations of alloying elements, atomic dissociation energy and APB energy are also discussed.
Key words: Fe3Al sublattice antiphase boundary order-disorder transition plasticity
