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Creep of binary Fe-Al alloys with ultrafine lamellar microstructures

Schmitt, Anke; Kumar, Sharvan K.; Kauffmann, Alexander; Li, Xiaolin; Stein, F.; Heilmaier, Martin

On the Al-rich side of the Fe-Al binary system, the eutectoid decomposition of Fe5Al8 into B2-ordered FeAl and triclinic FeAl2 in the composition range of 55–65 at.% Al produces an ultrafine lamellar microstructure. The compression creep behavior of such two-phase intermetallic materials was investigated in the temperature range 600–800 °C under constant stress. In addition to the fully lamellar Fe-61Al alloy, Fe-58Al and Fe-62Al that included, pro-eutectoid FeAl and FeAl2, respectively, were characterized in terms of their microstructure and creep response. For all microstructures, the strain rate as a function of time and strain exhibits a distinct minimum instead of a steady state creep regime. Microstructure instability, primarily in the vicinity of colony boundaries, is identified as the main reason for the increase in strain rate beyond the minimum. In contrast, lamellar coarsening is shown to be only a secondary factor influencing creep response for the conditions investigated. In comparison to single phase FeAl, the fully lamellar FeAl-FeAl2 shows enhanced creep resistance while the presence of either pro-eutectoid phase leads to a relative deterioration of the creep resistance.

Verlagsausgabe §
DOI: 10.5445/IR/1000072768/pub
Veröffentlicht am 25.11.2021
Postprint §
DOI: 10.5445/IR/1000072768
Veröffentlicht am 25.04.2018
DOI: 10.1016/j.intermet.2017.07.016
Zitationen: 12
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Maschinenbau (MACH)
Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2017
Sprache Englisch
Identifikator ISSN: 0966-9795, 1879-0216
KITopen-ID: 1000072768
HGF-Programm 34.13.02 (POF III, LK 01) Portfolio Material zukünftige Energief.
Erschienen in Intermetallics
Verlag Elsevier
Band 90
Seiten 180-187
Vorab online veröffentlicht am 01.08.2017
Schlagwörter 2016-017-016289 2015-015-008751 FIB
Nachgewiesen in Web of Science
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