Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation
In this work, CoCrNi, FeCoCrNi and CoCrFeMnNi concentrated alloys with a Y-Ti oxide particle dispersion were prepared by mechanical alloying and Spark Plasma Sintering. The alloy consists of an FCC Ni-based matrix with a Y-Ti oxide dispersion and additional phases of Cr<sub>23</sub>C<...
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| Online Access: | https://www.mdpi.com/1996-1944/13/10/2276 |
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| author | Monika Vilémová Hynek Hadraba Zdeněk Weiss František Lukáč Štefan Csáki Zdeněk Chlup Jiří Matějíček Tomáš Chráska |
| author_facet | Monika Vilémová Hynek Hadraba Zdeněk Weiss František Lukáč Štefan Csáki Zdeněk Chlup Jiří Matějíček Tomáš Chráska |
| author_sort | Monika Vilémová |
| collection | DOAJ |
| description | In this work, CoCrNi, FeCoCrNi and CoCrFeMnNi concentrated alloys with a Y-Ti oxide particle dispersion were prepared by mechanical alloying and Spark Plasma Sintering. The alloy consists of an FCC Ni-based matrix with a Y-Ti oxide dispersion and additional phases of Cr<sub>23</sub>C<sub>6</sub> and Cr<sub>2</sub>O<sub>3</sub>. The effect of Fe, Mn, and Y-Ti oxide particles on the formation of oxide scales and the composition of the adjacent CoCrNi and FeCoCrNi alloys was studied. It was found that alloys without Mn in their composition form a protective Cr<sub>2</sub>O<sub>3</sub> scale. The Cr<sub>23</sub>C<sub>6</sub> particles provide an alternative mechanism for balancing the chromium loss during the oxidation. Y and Ti from the oxide particles participate in the formation of the protective oxide scales. Fe promotes Y and especially Ti diffusion through the Cr<sub>2</sub>O<sub>3</sub> scale, resulting in the formation of Ti-depleted regions in the alloy. The findings will serve for the further development of these new materials. |
| first_indexed | 2024-03-10T19:48:53Z |
| format | Article |
| id | doaj.art-b89611ea426a4e6c9fc6ae8fcc9c333c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T19:48:53Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-b89611ea426a4e6c9fc6ae8fcc9c333c2023-11-20T00:34:30ZengMDPI AGMaterials1996-19442020-05-011310227610.3390/ma13102276Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature OxidationMonika Vilémová0Hynek Hadraba1Zdeněk Weiss2František Lukáč3Štefan Csáki4Zdeněk Chlup5Jiří Matějíček6Tomáš Chráska7Department of Materials Engineering, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00 Prague, Czech RepublicInstitute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech RepublicInstitute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech RepublicDepartment of Materials Engineering, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00 Prague, Czech RepublicDepartment of Materials Engineering, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00 Prague, Czech RepublicInstitute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech RepublicDepartment of Materials Engineering, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00 Prague, Czech RepublicDepartment of Materials Engineering, Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00 Prague, Czech RepublicIn this work, CoCrNi, FeCoCrNi and CoCrFeMnNi concentrated alloys with a Y-Ti oxide particle dispersion were prepared by mechanical alloying and Spark Plasma Sintering. The alloy consists of an FCC Ni-based matrix with a Y-Ti oxide dispersion and additional phases of Cr<sub>23</sub>C<sub>6</sub> and Cr<sub>2</sub>O<sub>3</sub>. The effect of Fe, Mn, and Y-Ti oxide particles on the formation of oxide scales and the composition of the adjacent CoCrNi and FeCoCrNi alloys was studied. It was found that alloys without Mn in their composition form a protective Cr<sub>2</sub>O<sub>3</sub> scale. The Cr<sub>23</sub>C<sub>6</sub> particles provide an alternative mechanism for balancing the chromium loss during the oxidation. Y and Ti from the oxide particles participate in the formation of the protective oxide scales. Fe promotes Y and especially Ti diffusion through the Cr<sub>2</sub>O<sub>3</sub> scale, resulting in the formation of Ti-depleted regions in the alloy. The findings will serve for the further development of these new materials.https://www.mdpi.com/1996-1944/13/10/2276FeCoNiCrCrMnFeCoNihigh-entropy alloysmedium-entropy alloysSpark Plasma SinteringY-Ti complex oxide nanoparticles |
| spellingShingle | Monika Vilémová Hynek Hadraba Zdeněk Weiss František Lukáč Štefan Csáki Zdeněk Chlup Jiří Matějíček Tomáš Chráska Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation Materials FeCoNiCr CrMnFeCoNi high-entropy alloys medium-entropy alloys Spark Plasma Sintering Y-Ti complex oxide nanoparticles |
| title | Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation |
| title_full | Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation |
| title_fullStr | Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation |
| title_full_unstemmed | Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation |
| title_short | Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation |
| title_sort | phase composition and structure changes of cocrni based concentrated alloys resulting from high temperature oxidation |
| topic | FeCoNiCr CrMnFeCoNi high-entropy alloys medium-entropy alloys Spark Plasma Sintering Y-Ti complex oxide nanoparticles |
| url | https://www.mdpi.com/1996-1944/13/10/2276 |
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