Matysik Piotr, Jóźwiak Stanisław, Czujko Tomasz
Department of Advanced Materials and Technologies, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Gen. S. Kaliskiego 2 St., Warsaw 00-908, Poland.
Materials (Basel). 2015 Mar 4;8(3):914-931. doi: 10.3390/ma8030914.
Fe-Al intermetallic alloys with aluminum content over 60 at% are in the area of the phase equilibrium diagram that is considerably less investigated in comparison to the high-symmetry Fe₃Al and FeAl phases. Ambiguous crystallographic information and incoherent data referring to the phase equilibrium diagrams placed in a high-aluminum range have caused confusions and misinformation. Nowadays unequivocal material properties description of FeAl₂, Fe₂Al₅ and FeAl₃ intermetallic alloys is still incomplete. In this paper, the influence of aluminum content and processing parameters on phase composition is presented. The occurrence of low-symmetry FeAl₂, Fe₂Al₅ and FeAl₃ structures determined by chemical composition and phase transformations was defined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) examinations. These results served to verify diffraction investigations (XRD) and to explain the mechanical properties of cast materials such as: hardness, Young's modulus and fracture toughness evaluated using the nano-indentation technique.
铝含量超过60原子百分比的铁铝金属间化合物合金，处于相平衡图中一个相较于高对称性的Fe₃Al和FeAl相研究较少的区域。关于高铝含量范围内相平衡图的模糊晶体学信息和不连贯数据，造成了混淆和错误信息。如今，对FeAl₂、Fe₂Al₅和FeAl₃金属间化合物合金明确的材料性能描述仍不完整。本文介绍了铝含量和加工参数对相组成的影响。通过扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）检查，确定了由化学成分和相变决定的低对称性FeAl₂、Fe₂Al₅和FeAl₃结构的出现情况。这些结果用于验证衍射研究（XRD），并解释铸造材料的力学性能，如使用纳米压痕技术评估的硬度、杨氏模量和断裂韧性。
