The effect of Zr addition on creep of Fe-30 at.% Al alloys

0398580 - ÚFM 2014 RIV GB eng J - Článek v odborném periodiku
Dobeš, Ferdinand - Kratochvíl, P.
The effect of Zr addition on creep of Fe-30 at.% Al alloys.
Intermetallics. Roč. 43, DEC (2013), s. 142-146. ISSN 0966-9795. E-ISSN 1879-0216
Grant CEP: GA ČR(CZ) GAP108/12/1452
Institucionální podpora: RVO:68081723
Klíčová slova: Iron aluminides * Laves phases * creep
Kód oboru RIV: JG - Hutnictví, kovové materiály
Impakt faktor: 2.119, rok: 2013

Compressive creep of alloys based on Fe-30 at.% Al with zirconium additions in the range of 0.4-5.2 at.% was studied at temperatures from 650 to 900 °C. The alloys were tested in two different states: (i) cast and (ii) annealed at 1000 °C for 50 h. Stress exponents of creep were estimated. The values of the stress exponent n can be explained by dislocation motion controlled by climb and by the presence of second-phase particles. Higher stress exponents were detected only at the temperature of 900 °C and with zirconium content of up to 2%. Creep resistance at temperatures of 700 and 900 °C increases with the increasing amounts of the secondary phases lambda and tau. At the temperature of 650 °C, creep resistance is given not only by the volume fraction of particles but also by the ratio of tau/lambda. This can be attributed to a more effective strengthening by particles of tau resulting either from their mechanical properties or from their finer distribution.
Trvalý link: http://hdl.handle.net/11104/0226095