Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides

0506331 - ÚFM 2020 RIV CH eng J - Journal Article
Svoboda, Jiří - Horník, Vít - Stratil, Luděk - Hadraba, Hynek - Mašek, B. - Khalaj, O. - Jirková, A.
Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides.
Metals. Roč. 8, č. 12 (2018), č. článku 1079. E-ISSN 2075-4701
R&D Projects: GA ČR(CZ) GA17-01641S
Institutional support: RVO:68081723
Keywords : nanostructured ferritic alloy * mechanical-properties * grain-growth * creep * model * recrystallization * oxides * precipitation * nanocomposite * recrystallization * creep * ODS alloys
OECD category: Thermodynamics
Impact factor: 2.259, year: 2018
Method of publishing: Open access
https://www.mdpi.com/2075-4701/8/12/1079/htm

Existing oxide dispersion strengthened (ODS) alloys are, besides Ni-based superalloy single crystals, the most creep-resistant materials. The creep resistance of the ODS alloys may, moreover, be significantly improved thanks to increasing the volume fraction of the nano oxides by more than one order of magnitude so that the oxides play a decisive role in strengthening. The present experimental study deals with two systems of such a high-volume fraction of nano oxides, namely, the Fe-11Al-1O and Fe-17Cr-7Al-4Y(2)O(3) systems prepared by mechanical alloying and hot rolling leading to a rather stable fine-grained microstructure. This microstructure undergoes static recrystallization at high temperatures. The kinetics of static recrystallization and coarsening of nano oxides in recrystallized grains is determined for both systems. The difference in kinetics of coarsening of Al-based and Y-based oxides in the Fe-11Al-1O and Fe-17Cr-7Al-4Y(2)O(3) systems is expressive and predetermines the Fe-17Cr-7Al-4Y(2)O(3) system or similar ones to become the new leading system among creep- and oxidation-resistant materials for applications up to 1200 degrees C.
Permanent Link: http://hdl.handle.net/11104/0300367