Oxidation of Al-Co Alloys at High Temperatures
In this work, the high temperature oxidation behavior of Al<sub>71</sub>Co<sub>29</sub> and Al<sub>76</sub>Co<sub>24</sub> alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high pur...
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| author | Patrik Šulhánek Marián Drienovský Ivona Černičková Libor Ďuriška Ramūnas Skaudžius Žaneta Gerhátová Marián Palcut |
| author_facet | Patrik Šulhánek Marián Drienovský Ivona Černičková Libor Ďuriška Ramūnas Skaudžius Žaneta Gerhátová Marián Palcut |
| author_sort | Patrik Šulhánek |
| collection | DOAJ |
| description | In this work, the high temperature oxidation behavior of Al<sub>71</sub>Co<sub>29</sub> and Al<sub>76</sub>Co<sub>24</sub> alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high purity argon. The as-solidified alloys were found to consist of several different phases, including structurally complex m-Al<sub>13</sub>Co<sub>4</sub> and Z-Al<sub>3</sub>Co phases. The high temperature oxidation behavior of the alloys was studied by simultaneous thermal analysis in flowing synthetic air at 773–1173 K. A protective Al<sub>2</sub>O<sub>3</sub> scale was formed on the sample surface. A parabolic rate law was observed. The rate constants of the alloys have been found between 1.63 × 10<sup>−14</sup> and 8.83 × 10<sup>−12</sup> g cm<sup>−4</sup> s<sup>−1</sup>. The experimental activation energies of oxidation are 90 and 123 kJ mol<sup>−1</sup> for the Al<sub>71</sub>Co<sub>29</sub> and Al<sub>76</sub>Co<sub>24</sub> alloys, respectively. The oxidation mechanism of the Al-Co alloys is discussed and implications towards practical applications of these alloys at high temperatures are provided. |
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| id | doaj.art-ed55c8d37652451e92637672038c701d |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T18:28:10Z |
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| spelling | doaj.art-ed55c8d37652451e92637672038c701d2023-11-20T06:50:57ZengMDPI AGMaterials1996-19442020-07-011314315210.3390/ma13143152Oxidation of Al-Co Alloys at High TemperaturesPatrik Šulhánek0Marián Drienovský1Ivona Černičková2Libor Ďuriška3Ramūnas Skaudžius4Žaneta Gerhátová5Marián Palcut6Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, SlovakiaFaculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, SlovakiaFaculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, SlovakiaFaculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, SlovakiaFaculty of Chemistry and Geosciences, Vilnius University, Naugarduko g. 24, 01513 Vilnius, LithuaniaFaculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, SlovakiaFaculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, J. Bottu 24, 91724 Trnava, SlovakiaIn this work, the high temperature oxidation behavior of Al<sub>71</sub>Co<sub>29</sub> and Al<sub>76</sub>Co<sub>24</sub> alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high purity argon. The as-solidified alloys were found to consist of several different phases, including structurally complex m-Al<sub>13</sub>Co<sub>4</sub> and Z-Al<sub>3</sub>Co phases. The high temperature oxidation behavior of the alloys was studied by simultaneous thermal analysis in flowing synthetic air at 773–1173 K. A protective Al<sub>2</sub>O<sub>3</sub> scale was formed on the sample surface. A parabolic rate law was observed. The rate constants of the alloys have been found between 1.63 × 10<sup>−14</sup> and 8.83 × 10<sup>−12</sup> g cm<sup>−4</sup> s<sup>−1</sup>. The experimental activation energies of oxidation are 90 and 123 kJ mol<sup>−1</sup> for the Al<sub>71</sub>Co<sub>29</sub> and Al<sub>76</sub>Co<sub>24</sub> alloys, respectively. The oxidation mechanism of the Al-Co alloys is discussed and implications towards practical applications of these alloys at high temperatures are provided.https://www.mdpi.com/1996-1944/13/14/3152Al alloyCo alloycomplex intermetallicoxidation kineticsoxide scale |
| spellingShingle | Patrik Šulhánek Marián Drienovský Ivona Černičková Libor Ďuriška Ramūnas Skaudžius Žaneta Gerhátová Marián Palcut Oxidation of Al-Co Alloys at High Temperatures Materials Al alloy Co alloy complex intermetallic oxidation kinetics oxide scale |
| title | Oxidation of Al-Co Alloys at High Temperatures |
| title_full | Oxidation of Al-Co Alloys at High Temperatures |
| title_fullStr | Oxidation of Al-Co Alloys at High Temperatures |
| title_full_unstemmed | Oxidation of Al-Co Alloys at High Temperatures |
| title_short | Oxidation of Al-Co Alloys at High Temperatures |
| title_sort | oxidation of al co alloys at high temperatures |
| topic | Al alloy Co alloy complex intermetallic oxidation kinetics oxide scale |
| url | https://www.mdpi.com/1996-1944/13/14/3152 |
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