J. Phys. IV France 123 (2005) 117-120
Fe-NiAl based alloys: Phase transformations and microstructure due to cobalt additionG. Marcon1, S. Lay1, B. Djerdjare2 and S. Lebaili2
1 Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques UMR 5614, INPG, CNRS/UJF, BP. 75, Domaine Universitaire, 38402 Saint-Martin-d'Hères Cedex, France
2 Laboratoire de Science et Génie des Matériaux, Université des Sciences et de la Technologie Houari Boumédienne, BP. 32, El-Alia Bab-Ezzouar, Alger, Algérie
Structural characterisation of (Fe, Co)-NiAl alloys containing 0-50 at. % Co was performed. In alloys containing more than 15 at. % Co a high-temperature bcc phase is partly transformed, when cooled, to a phase, which at lower temperature is allotropically transformed into a phase. The untransformed phase, according to Co content, is then transformed by a demixtion process into two and phases. The main cobalt addition effects on the Fe-NiAl based alloy are: the appearance of the phase, a decrease of demixtion temperature, an increase of Curie temperature and a microstructure refining.
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