Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

The investigations of Fe-Al phases formation arround SHS reaction in isothermal conditions

nr katalogowy: 52716

The process of Fe-Al phases formation has been the subject of interest for many years and it was described by many scientists. There are a lot of different theories explaining the mechanisms occurring during phases formation. One of the main theory was described by Deevi and Gedevanishvili [1]. They observed, that during the heating of Fe and Al powders mixture two exothermic reactions have occured. At temperature range of 540÷560°C the self-propagating high-temperature synthesis (SHS) [2, 6÷8] occurs and it is responsible for formation of the hard and fragile Fe2Al5 phase. Next reaction, at temperature range of 650÷670°C, leads to nucleation and growth of FeAl secondary solid solution. It is the effect of interaction between remaining iron and Fe2Al5 phase what was confirmed by Gao and coworkers [3]. Wei-Jen and Wang coated mild steel by hot-dipping in a molten aluminum bath and they obtained thin layers of FeAl3 and Fe2Al5 phases [4]. Whole set of phases in the Fe-Al system (FeAl3, FeAl2, Fe2Al5, Fe3Al and FeAl) was observed by other authors after sintering process and SHS reaction [5, 10, 17] The aim of this paper is to explain the phenomena occurs before and during SHS reaction. It is very important to describe phases transformations around SHS reaction, because they can influence the final structure of Fe-Al sinters. The obtained results showed that in sinter structure there are not only Fe2Al5 phase and aluminumlow Fe(Al) solid solution but also high-aluminum FeAl2 and FeAl3 phases, formed prior the SHS reaction. EXPERIMENTAL Elemental powders of 99.8% pure iron with an average particle size of 200 μm and 99.6% pure aluminum with an average particle size of 70 μm were mixed at a steichiometric ratio of 50 at. % Fe-50 at. % Al in a Uniball 5 mill (without milling balls) for 1 h. Than the cylindrical DSC specimens (3 mm in diameter and 20 mg in weight) were cold compacted uniaxially at a pressure of 700 MPa. Ob[...]

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