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

Metals

卷:8

Bohuslav Mašek¹  Jiří Svoboda²  Vít Horník²  Hynek Hadraba²  Luděk Stratil²  Omid Khalaj³  Hana Jirková³ 

[1] COMTES FHT, 334 41 Dobřany, Czech Republic;

[2] Institute of Physics of Materials, Academy of Science of the Czech Republic, 616 62 Brno, Czech Republic;

[3] Regional Technological Institute, University of West Bohemia, 301 00 Plzeň, Czech Republic;

关键词: oxides;    precipitation;    nanocomposite;    recrystallization;    creep;    ODS alloys;   

DOI  :  10.3390/met8121079

来源: DOAJ

【 摘 要 】

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-4Y₂O₃ 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-4Y₂O₃ systems is expressive and predetermines the Fe-17Cr-7Al-4Y₂O₃ system or similar ones to become the new leading system among creep- and oxidation-resistant materials for applications up to 1200 °C.

【 授权许可】

Unknown