Formation and crystal structure of the τ phase in the Al-Fe-Mn-Si system

The aim of the present study was to determine the minimum iron content in the alloy necessary for the formation of the τ phase as primary phase. The crystal structure of the τ phase in the Al-Fe-Mn-Si system was determined by X-ray diffraction. The τ phase was found to have hexagonal crystal structu...

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Bibliographic Details
Published in:Materials letters 2016-10, Vol.180, p.277-279
Main Authors: Orozco-González, P., Castro-Román, M., Muñiz-Valdez, R., Luna-Álvarez, S., Equihua-Guillén, F., Hernández-Rodríguez, A., Baltazar-Hernández, V.H., Alvarado-Hernández, F.
Format: Article
Language:English
Subjects:
Alloying additive
Crystal structure
Diffraction
Formations
Intermetallic alloys and compounds
Iron
Lattice parameters
Microstructure
Quaternary systems
Solidification
X-rays
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Summary:The aim of the present study was to determine the minimum iron content in the alloy necessary for the formation of the τ phase as primary phase. The crystal structure of the τ phase in the Al-Fe-Mn-Si system was determined by X-ray diffraction. The τ phase was found to have hexagonal crystal structure (P63/mmc space group). Accordingly, the τ phase actually has the formula Al9.15Fe2.09MnSi1.52. Its lattice parameters are a=7.502 and c=7.587Å. The present results suggest that due to the Mn addition, the formation of the τh phase upon solidification of the alloy can be stabilized in the quaternary Al-Fe-Mn-Si system, with respect to the monoclinic θ-Al3Fe phase in the ternary Al-Fe-Si system. •Enhance information about the formation of Fe-rich intermetallics in the Al-Fe-Mn-Si system.•Characterizes the crystal structure type and chemical composition of the τh phase in the Al-Fe-Mn-Si system.•Enhance the available data concerning the domains of existence of τh and αh phases in the Al-Fe-Mn-Si system.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2016.05.139