The effect of carbon and silicon additions on the creep properties of Fe-40 at. % Al type alloys at elevated temperatures

0364467 - ÚFM 2012 RIV GB eng J - Journal Article
Dobeš, Ferdinand - Kratochvíl, P. - Vodičková, V.
The effect of carbon and silicon additions on the creep properties of Fe-40 at. % Al type alloys at elevated temperatures.
Intermetallics. Roč. 19, č. 10 (2011), s. 1526-1532. ISSN 0966-9795. E-ISSN 1879-0216
R&D Projects: GA ČR GA106/08/1238
Institutional research plan: CEZ:AV0Z20410507
Keywords : Iron aluminides * creep
Subject RIV: JG - Metallurgy
Impact factor: 1.649, year: 2011

The mechanical properties of FeAl alloys with 39-43 at.% Al, C contents up to 4.9 at.% and Si contents up to 1.2 at.% were studied using uniaxial compressive creep at temperatures from 600 to 800 C. The stress and temperature dependence of the creep rate were determined by stepwise loading and evaluated in terms of the stress exponent n and the activation energy Q, respectively. These quantities can be interpreted by means of dislocation motion controlled by climb and by the presence of second-phase particles. The dislocation motion is obstructed by precipitates of carbide k in alloys E and F and by particles of Al4C3 in the alloys with either higher content of C or of C and Si. Both carbon and silicon improved the creep resistance, but the effect of silicon was more significant.
Permanent Link: http://hdl.handle.net/11104/0199947