Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides
Abstract
:1. Introduction
2. Preparation of Specimens
- MA of Fe powder alone in O2 gas closed in the airtight milling container.
- Addition of Al powder and continuation of MA after evacuation.
3. Initial Microstructure of the Specimens
4. Static Recrystallization in the Fe-11Al-1O System
5. Static Recrystallization in the Fe-11Al-1O System
6. Coarsening of Oxides in the Fe-11Al-1O and Fe-17Cr-7Al-4Y2O3 Systems
7. Discussion
8. Conclusions
- Static recrystallization occurs in the Fe-11Al-1O system at 1000 °C and in the Fe-17Cr-7Al-4Y2O3 system at 1120 °C with nearly the same kinetics leading to practically the same coarse-grained (25 μm) microstructure with a dispersion of nano oxides of mean size 10 nm in grain interiors.
- Coarsening of oxides in the Fe-11Al-1O system at 1200 °C is about two orders of magnitude faster than in the Fe-17Cr-7Al-4Y2O3 system.
- An admirable stability of the Y-based oxides and an excellent oxidation predetermine the Fe-17Cr-7Al-4Y2O3 and similar systems to become oxidation- and creep-resistant structural materials.
Author Contributions
Funding
Conflicts of Interest
References
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Svoboda, J.; Horník, V.; Stratil, L.; Hadraba, H.; Mašek, B.; Khalaj, O.; Jirková, H. Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides. Metals 2018, 8, 1079. https://doi.org/10.3390/met8121079
Svoboda J, Horník V, Stratil L, Hadraba H, Mašek B, Khalaj O, Jirková H. Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides. Metals. 2018; 8(12):1079. https://doi.org/10.3390/met8121079
Chicago/Turabian StyleSvoboda, Jiří, Vít Horník, Luděk Stratil, Hynek Hadraba, Bohuslav Mašek, Omid Khalaj, and Hana Jirková. 2018. "Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides" Metals 8, no. 12: 1079. https://doi.org/10.3390/met8121079