Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides
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...
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MDPI AG
2018-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/8/12/1079 |
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| author | Jiří Svoboda Vít Horník Luděk Stratil Hynek Hadraba Bohuslav Mašek Omid Khalaj Hana Jirková |
| author_facet | Jiří Svoboda Vít Horník Luděk Stratil Hynek Hadraba Bohuslav Mašek Omid Khalaj Hana Jirková |
| author_sort | Jiří Svoboda |
| collection | DOAJ |
| description | 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<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> systems is expressive and predetermines the Fe-17Cr-7Al-4Y<sub>2</sub>O<sub>3</sub> system or similar ones to become the new leading system among creep- and oxidation-resistant materials for applications up to 1200 °C. |
| first_indexed | 2024-12-16T06:42:14Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-16T06:42:14Z |
| publishDate | 2018-12-01 |
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| spelling | doaj.art-3d4762c611d5480e8096fdcd0e8d894d2022-12-21T22:40:39ZengMDPI AGMetals2075-47012018-12-01812107910.3390/met8121079met8121079Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano OxidesJiří Svoboda0Vít Horník1Luděk Stratil2Hynek Hadraba3Bohuslav Mašek4Omid Khalaj5Hana Jirková6Institute of Physics of Materials, Academy of Science of the Czech Republic, 616 62 Brno, Czech RepublicInstitute of Physics of Materials, Academy of Science of the Czech Republic, 616 62 Brno, Czech RepublicInstitute of Physics of Materials, Academy of Science of the Czech Republic, 616 62 Brno, Czech RepublicInstitute of Physics of Materials, Academy of Science of the Czech Republic, 616 62 Brno, Czech RepublicCOMTES FHT, 334 41 Dobřany, Czech RepublicRegional Technological Institute, University of West Bohemia, 301 00 Plzeň, Czech RepublicRegional Technological Institute, University of West Bohemia, 301 00 Plzeň, Czech RepublicExisting 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<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> systems is expressive and predetermines the Fe-17Cr-7Al-4Y<sub>2</sub>O<sub>3</sub> system or similar ones to become the new leading system among creep- and oxidation-resistant materials for applications up to 1200 °C.https://www.mdpi.com/2075-4701/8/12/1079oxidesprecipitationnanocompositerecrystallizationcreepODS alloys |
| spellingShingle | Jiří Svoboda Vít Horník Luděk Stratil Hynek Hadraba Bohuslav Mašek Omid Khalaj Hana Jirková Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides Metals oxides precipitation nanocomposite recrystallization creep ODS alloys |
| title | Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides |
| title_full | Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides |
| title_fullStr | Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides |
| title_full_unstemmed | Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides |
| title_short | Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides |
| title_sort | microstructure evolution in ods alloys with a high volume fraction of nano oxides |
| topic | oxides precipitation nanocomposite recrystallization creep ODS alloys |
| url | https://www.mdpi.com/2075-4701/8/12/1079 |
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