(北京科技大學(xué)材料系，北京100083)
摘 要: 研究了Cr、Mo、Ti、Ni、Mn、Si等代位合金元素對(duì)當(dāng)量成分、DO3結(jié)構(gòu)等軸晶Fe3Al合金真空拉伸性能、DO3轉(zhuǎn)變溫度Tc、DO3有序度、位錯(cuò)反相疇、位錯(cuò)組態(tài)等的影響從合金元素原子在Fe3Al單胞亞點(diǎn)陣占位、原子解離能、反相疇界能等方面進(jìn)行了初步探討。結(jié)果表明與Fe3Al相比，Cr的添加降低合金的Tc溫度、提高真空拉伸延率，與Cr-Al原子對(duì)交互作用能、反相疇界能的降低有關(guān)；其它三元合金都表現(xiàn)高的Tc溫度與低的塑性。
關(guān)鍵字: Fe3Al 亞點(diǎn)陣 位錯(cuò)反相疇界 有序無(wú)序轉(zhuǎn)變 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
