The Formation Mechanism of Iron Aluminide Phases in Fe-Al System with Different Raw Materials Ratio

Document Type : Research Article


1 Department of Material Science and Engineering, Birjand University of Technology, Birjand, Iran

2 Department of Mechanics, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran


In this study, the formation mechanism of iron aluminide phases in the Fe-Al system with different raw material ratios was investigated. In aluminide systems, full consumption of aluminium or its presence have a major impact on the reaction process, the type of products and the mechanism. However these have not studied and only a defined stoichiometric ratio has been established. Therefore, the current study objective is to determine the effect of raw materials proportion on the reaction mechanism. To achieve this goal, the samples with ratios of 1:3, 1:1 and 3:1 of iron and aluminum were heat treated at 700, 800 and 900ºC. It was found that the first phase formed is Fe2Al5. It also proved that the following reaction trend depends on the primary content of iron and aluminum. In the ratio of 3:1 of iron and aluminum, the system tends to achieve the Fe3Al phase at higher temperatures while in the ratio of 1:1 and 1:3, FeAl is the final product. It also was found that more Al postpones the FeAl formation. In the other words, FeAl can be produced at the lower temperature in the ratio of 1:1 of iron and aluminum in the comparison with the ratio of 1:3.


Main Subjects

[1] S.E. Haghighi, K. Janghorban, S. Izadi, Structural evolution of Fe–50 at.% Al powders during mechanical alloying and subsequent annealing processes, Journal of Alloys and Compounds, 495(1) (2010) 260-264.
[2] G.W. Meetham, M.H.V.d. Voorde, Materials for High Temperature Engineering Applications, Springer, Berline, (2000).
[3] M. Zamanzade, A. Barnoush, C. Motz, A Review on the Properties of Iron Aluminide Intermetallics, Crystals 2016, 6(10) (2016).
[4] S.C. Deevi, V.K. Sikka, Nickel and iron aluminides: an overview on properties, processing, and applications, Intermetallics, 4(5) (1996) 357-375.
[5] S.C. Deevi, V.K. Sikka, C.T. Liu, Processing, properties, and applications of nickel and iron aluminides, Progress in Materials Science, 42(1) (1997) 177-192.
[6] P. Novák, A. Michalcová, I. Marek, M. Mudrová, K. Saksl, J. Bednarčík, P. Zikmund, D. Vojtěch, On the formation of intermetallics in Fe–Al system – An in situ XRD study, Intermetallics, 32(0) (2013) 127-136.
[7] P. Novak, A. Michalcova, I. Marek, M. Murova, J. Bednarcik, K. Saksl, Formation of intermetallics during reactive sintering production of Fe-Al alloys Metal 5(2012) 23 - 25.
[8] M. Chojnacki, S. Jóźwiak, K. Karczewski, Z. Bojar, Modification of Fe and Al elemental powders’ sintering with addition of magnesium and magnesium hydride, Intermetallics, 19(10) (2011) 1555-1562.
[9] H. Gao, Y. He, P. Shen, J. Zou, N. Xu, Y. Jiang, B. Huang, C.T. Liu, Porous FeAl intermetallics fabricated by elemental powder reactive synthesis, Intermetallics, 17(12) (2009) 1041-1046.
[10] S. Gedevanishvili, S.C. Deevi, Processing of iron aluminides by pressureless sintering through Fe+Al elemental route, Materials Science and Engineering: A, 325(1–2) (2002) 163-176.
[11] H. Sina, J. Corneliusson, K. Turba, S. Iyengar, A study on the formation of iron aluminide (FeAl) from elemental powders Journal of Alloys and Compounds, 636 (2015) 261-269.
[12] S. Jóźwiak, K. Karczewski, Z. Bojar, Kinetics of reactions in FeAl synthesis studied by the DTA technique and JMA model, Intermetallics, 18(7) (2010) 1332-1337.
[13] E. Pocheć, S. Jóźwiak, K. Karczewski, Z. Bojar, Fe-Al phase formation around SHS reactions under isothermal conditions, Journal of Alloys and Compounds, 509(4) (2011) 1124-1128.
[14] E. Pochec, S. Jozwiak, K. Karczewski, Z. Bojar, Maps of Fe-Al phases formation kinetics parameters during isothermal sintering, Thermochimica Acta, 545 (2012) 14-19.
[15] Nikolay A. Belov, Dmitry G. Eskin, A.A. Aksenov, Multicomponent Phase Diagrams: Applications for Commercial Aluminum Alloys, Elsevier, (2005).
[16] A. Mohsenifar, M.R. Aboutalebi, S. Seyedein, Effect of high temperature oxidation on the corrosion behavior of aluminized low carbon steel in molten aluminum, (2015).
[17] R. Khoshhal, A. Hosseinzadeh, Investigation of the mechanism of Fe2Al5 powder into FeAl powder transformation, Metal Powder Report, 74(1) (2019) 25-29.
[18] M.A. Morris-Muñoz, A. Dodge, D.G. Morris, Structure, strength and toughness of nanocrystalline FeAl, Nanostructured Materials, 11(7) (1999) 873-885.
[19] R.W. Richards, R.D. Jones, P.D. Clements, H. Clarke, Metallurgy of continuous hot dip aluminizing, International Materials Reviews, 39(5) (1994) 191-212.
[20] B.M. Mutasa, Defect Structures in Ordered Intermetallics; Grain Boundaries and Surfaces in FeAl, NiAl, CoAl and TiAl, The faculty of the Virginia Polytechnic Institute (1997).