Oxide transformations during sintering of in situ oxidised FeAl powders

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 207; no. 1; pp. 105 - 114
• Main Authors: Wolski, K., Thévenot, F., Coze, J. Le
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.03.1996; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; FeAl powders; Intermetallics; Internal oxidation; Mechanical alloying; Metals. Metallurgy; Oxide dispersion; Oxide transformation; Powder metallurgy. Composite materials; Production techniques; Sintered metals and alloys. Pseudo alloys. Cermets; Intermetallics; FeAl powders; Oxide dispersion; Mechanical alloying; Internal oxidation; Oxide transformation; Metal powder; Intermetallic compound; Aluminium alloy; XRD; Experimental study; Powder metallurgy; Transition metal alloy; Sintering; TEM; Iron base alloys; Binary alloy
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/0921-5093(96)80007-4

Powder metallurgy has been used to prepare FeAl powders with in situ created oxidation products. The aim of this study was to analyse the types of oxide formed as a function of sintering conditions. Highly oxidised powders have been used to give evidence of these transformations by X-ray diffraction. It has been shown that low temperature sintering ( T < 1200 °C) results in the formation of FeAl 2O 4 spinel, while higher sintering temperatures lead to its transformation into α-Al 2O 3 and coarsening. An attempt, based on thermodynamic calculations, has been made to explain the formation of FeAl 2O 4 spinel.