High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy
A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type of aluminum alloy is susceptible to the depletion of surface layers from Li. Therefore, choosing a suitable homogenization temperature and duration is a crucial...
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MDPI AG
2024-01-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/14/2/136 |
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| author | Rostislav Králík Lucia Bajtošová Barbora Kihoulou Dalibor Preisler Miroslav Cieslar |
| author_facet | Rostislav Králík Lucia Bajtošová Barbora Kihoulou Dalibor Preisler Miroslav Cieslar |
| author_sort | Rostislav Králík |
| collection | DOAJ |
| description | A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type of aluminum alloy is susceptible to the depletion of surface layers from Li. Therefore, choosing a suitable homogenization temperature and duration is a crucial step in assuring a homogeneous distribution of alloying elements and optimal exploitation of the potential of the alloy. In situ heating in an electron microscope was performed on a twin-roll-cast Al-Cu-Li-Mg-Sc-Zr alloy to understand the peculiarities of the homogenization process. Four types of primary phase particles rich in Cu, Li, Mg, and Fe were identified in the as-cast material. They appear as coarse particles at the boundaries of eutectic cells. Their partial dissolution occurs at temperatures above 450 °C. They are almost fully dissolved at 550 °C, except for complex phases containing Fe and Cu. Small dimensions of eutectic cells in the range of 10 µm assure a homogeneous distribution of the main alloying elements within the matrix after 20 min of annealing at 530 °C. Direct comparison with the same material prepared by mold casting indicates that such short annealing times result in the dissolution of the main primary phase particles but do not assure a homogeneous distribution of the alloying elements in the whole volume of the specimen. |
| first_indexed | 2024-03-07T22:36:41Z |
| format | Article |
| id | doaj.art-9a64d251db2d4b27bd8cb2dcab50a542 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-07T22:36:41Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-9a64d251db2d4b27bd8cb2dcab50a5422024-02-23T15:13:10ZengMDPI AGCrystals2073-43522024-01-0114213610.3390/cryst14020136High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron MicroscopyRostislav Králík0Lucia Bajtošová1Barbora Kihoulou2Dalibor Preisler3Miroslav Cieslar4Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech RepublicFaculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech RepublicA homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type of aluminum alloy is susceptible to the depletion of surface layers from Li. Therefore, choosing a suitable homogenization temperature and duration is a crucial step in assuring a homogeneous distribution of alloying elements and optimal exploitation of the potential of the alloy. In situ heating in an electron microscope was performed on a twin-roll-cast Al-Cu-Li-Mg-Sc-Zr alloy to understand the peculiarities of the homogenization process. Four types of primary phase particles rich in Cu, Li, Mg, and Fe were identified in the as-cast material. They appear as coarse particles at the boundaries of eutectic cells. Their partial dissolution occurs at temperatures above 450 °C. They are almost fully dissolved at 550 °C, except for complex phases containing Fe and Cu. Small dimensions of eutectic cells in the range of 10 µm assure a homogeneous distribution of the main alloying elements within the matrix after 20 min of annealing at 530 °C. Direct comparison with the same material prepared by mold casting indicates that such short annealing times result in the dissolution of the main primary phase particles but do not assure a homogeneous distribution of the alloying elements in the whole volume of the specimen.https://www.mdpi.com/2073-4352/14/2/136Al-Cu-Li-Mg-Sc-Zr alloyin situ TEMhomogenizationprimary phase particlestwin-roll castingmold casting |
| spellingShingle | Rostislav Králík Lucia Bajtošová Barbora Kihoulou Dalibor Preisler Miroslav Cieslar High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy Crystals Al-Cu-Li-Mg-Sc-Zr alloy in situ TEM homogenization primary phase particles twin-roll casting mold casting |
| title | High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy |
| title_full | High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy |
| title_fullStr | High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy |
| title_full_unstemmed | High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy |
| title_short | High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy |
| title_sort | high temperature phase transformations in al li cu mg zr sc alloy studied via in situ electron microscopy |
| topic | Al-Cu-Li-Mg-Sc-Zr alloy in situ TEM homogenization primary phase particles twin-roll casting mold casting |
| url | https://www.mdpi.com/2073-4352/14/2/136 |
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