Characterization of Low-Symmetry Structures from Phase Equilibrium of Fe-Al System-Microstructures and Mechanical Properties

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...

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Bibliographic Details
Published in:Materials 2015-03, Vol.8 (3), p.914-931
Main Authors: Matysik, Piotr, Jóźwiak, Stanisław, Czujko, Tomasz
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Ambiguity
Equilibrium
Ferrous alloys
Homogenization
Intermetallic compounds
Intermetallics
Iron aluminides
Mechanical properties
Microstructure
Phase diagrams
Powder metallurgy
Scanning electron microscopy
Sintering
Symmetry
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma8030914