Precipitation of Fe-rich intermetallic phases in liquid Al-13.58Si-11.59Fe-1.19Mn alloy

• Published in: Intermetallics 2010-08, Vol.18 (8), p.1617-1622
• Main Authors: Orozco-Gonzalez, P, Castro-Roman, M, Martinez, Arturo I, Herrera-Trejo, M, Lopez, A A, Quispe-Marcatoma, J
• Format: Article
• Language: English
• Subjects: A. Aluminides; Alloy systems; Aluminum; Aluminum base alloys; B. Crystallography; C. Crystal growth; Diffraction; F. Diffraction; Intermetallic phases; Liquids; Phase identification; Phases; Thermal analysis
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2010.04.014

To contribute to the understanding of the Al–Fe–Mn–Si system, an exhaustive analysis of the intermetallic phases formed during thermal analysis experiments and specific isothermal treatments was carried out. In this work, three different phases were identified: the extensively reported β and α phases and the τ h phase. The τ h phase has been reported for the ternary Al–Fe–Si system, but not for the quaternary Al–Fe–Mn–Si system. Nonetheless, the present results suggest that the formation of the τ h phase upon solidification of the alloy can be stabilized in the quaternary Al–Fe–Mn–Si system, with respect to the monoclinic θ-Al 3Fe phase in the ternary Al–Fe–Si system, due to the Mn addition. The τ h phase was unambiguously identified with the help of complementary techniques such as SEM/EDS, X-ray diffraction and Mössbauer spectroscopy.