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Oxidation Behaviour of Binary Aluminium-Rich Fe-Al Alloys with Fine-Scaled, Lamellar Microstructure

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Li,  Xiaolin
Intermetallic Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Stein,  Frank
Intermetallic Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Scherf, A., Janda, D., Baghaie Yazdi, M., Li, X., Stein, F., & Heilmaier, M. (2015). Oxidation Behaviour of Binary Aluminium-Rich Fe-Al Alloys with Fine-Scaled, Lamellar Microstructure. Oxidation of Metals, 83(5-6), 559-574. doi:10.1007/s11085-015-9535-6.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-12D9-2
Abstract
The oxidation behavior of binary Fe-Al alloys with an aluminum content between 58 and 64 at.% was studied by isothermal and cyclic oxidation experiments in a temperature range of 900-1000 A degrees C. The parabolic rate constants were determined to be comparable to those of B2-ordered Fe-48Al. All investigated alloys exhibited a fine-scaled, lamellar microstructure (< 300 nm lamellar spacing), which was a result of the eutectoid decomposition of the high-temperature phase Fe5Al8 into FeAl and FeAl2. None of these two phases showed a preferential oxidation. At 900 A degrees C theta-Al2O3 formed, whereas at 1000 A degrees C a transformation of the initially formed theta-Al2O3 to the slower growing and passivating alpha-Al2O3 was confirmed by grazing incidence X-ray diffraction measurements.