Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach
In lightweight high-entropy alloy development, a titanium- aluminium (TiAl) base matrix is favored for its low density, high strength- to-weight ratio, and excellent corrosion resistance. Multi-component alloys using TiAl have shown stability under high temperatures. This study aimed to develop a hi...
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EDP Sciences
2024-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2024/18/matecconf_rapdasa2024_06003.pdf |
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| author | Ben Festus Phahlane Thabang A. Ukpong Aniekan M. Olubambi Peter A. |
| author_facet | Ben Festus Phahlane Thabang A. Ukpong Aniekan M. Olubambi Peter A. |
| author_sort | Ben Festus |
| collection | DOAJ |
| description | In lightweight high-entropy alloy development, a titanium- aluminium (TiAl) base matrix is favored for its low density, high strength- to-weight ratio, and excellent corrosion resistance. Multi-component alloys using TiAl have shown stability under high temperatures. This study aimed to develop a high-entropy alloy by adding chromium (Cr), manganese (Mn), and molybdenum (Mo) to the TiAl base matrix, forming an AlxCrMn5MoTi alloy. CALPHAD models were employed to establish phase stability and phase formation rules were used to assess thermodynamic stability. The resulting AlxCrMn5MoTi alloy features a body-centered cubic solid-solution phase, a solidus temperature exceeding 1600°C, a density under 6.2 g/cm³, and a Young's modulus of over 190 GPa. The thermodynamic properties measured include mixing entropy (10.9 to 11.9 J/K), mixing enthalpy (-11.5 to -18.1 kJ/mol), an Omega parameter (Ω) of at least 1.1, an atomic size difference (δ) no greater than 6.6%, and a valence electron concentration (VEC) ranging from 4.89 to 4.83. The AlxCrMn5MoTi alloy shows significant promise for transportation, energy, and industrial applications, meeting the demands for lightweight, high-temperature, and corrosion- resistant materials. |
| format | Article |
| id | doaj-art-d48673a3ca54431cab8675329f2d677b |
| institution | OA Journals |
| issn | 2261-236X |
| language | English |
| publishDate | 2024-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj-art-d48673a3ca54431cab8675329f2d677b2025-08-20T02:38:05ZengEDP SciencesMATEC Web of Conferences2261-236X2024-01-014060600310.1051/matecconf/202440606003matecconf_rapdasa2024_06003Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approachBen Festus0Phahlane Thabang A.1Ukpong Aniekan M.2Olubambi Peter A.3Department of Metallurgy, University of JohannesburgDepartment of Metallurgy, University of JohannesburgSchool of Chemistry and Physics, University of KwaZulu-NatalDepartment of Metallurgy, University of JohannesburgIn lightweight high-entropy alloy development, a titanium- aluminium (TiAl) base matrix is favored for its low density, high strength- to-weight ratio, and excellent corrosion resistance. Multi-component alloys using TiAl have shown stability under high temperatures. This study aimed to develop a high-entropy alloy by adding chromium (Cr), manganese (Mn), and molybdenum (Mo) to the TiAl base matrix, forming an AlxCrMn5MoTi alloy. CALPHAD models were employed to establish phase stability and phase formation rules were used to assess thermodynamic stability. The resulting AlxCrMn5MoTi alloy features a body-centered cubic solid-solution phase, a solidus temperature exceeding 1600°C, a density under 6.2 g/cm³, and a Young's modulus of over 190 GPa. The thermodynamic properties measured include mixing entropy (10.9 to 11.9 J/K), mixing enthalpy (-11.5 to -18.1 kJ/mol), an Omega parameter (Ω) of at least 1.1, an atomic size difference (δ) no greater than 6.6%, and a valence electron concentration (VEC) ranging from 4.89 to 4.83. The AlxCrMn5MoTi alloy shows significant promise for transportation, energy, and industrial applications, meeting the demands for lightweight, high-temperature, and corrosion- resistant materials.https://www.matec-conferences.org/articles/matecconf/pdf/2024/18/matecconf_rapdasa2024_06003.pdf |
| spellingShingle | Ben Festus Phahlane Thabang A. Ukpong Aniekan M. Olubambi Peter A. Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach MATEC Web of Conferences |
| title | Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach |
| title_full | Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach |
| title_fullStr | Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach |
| title_full_unstemmed | Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach |
| title_short | Thermodynamic stability analysis of AlxCrMn5MoTi high-entropy alloys for high-temperature applications: A CALPHAD-assisted approach |
| title_sort | thermodynamic stability analysis of alxcrmn5moti high entropy alloys for high temperature applications a calphad assisted approach |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2024/18/matecconf_rapdasa2024_06003.pdf |
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