A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization
An optimized homogenization process for Al alloy ingots is key to subsequent material manufacturing, as it largely reduces metallurgical defects, such as segregation and secondary phases. However, studies on their exact microstructural evolution at different homogenization temperatures are scarce, e...
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MDPI AG
2022-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6573 |
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| author | Hao Huang Wei Xiong Zhen Jiang Jin Zhang |
| author_facet | Hao Huang Wei Xiong Zhen Jiang Jin Zhang |
| author_sort | Hao Huang |
| collection | DOAJ |
| description | An optimized homogenization process for Al alloy ingots is key to subsequent material manufacturing, as it largely reduces metallurgical defects, such as segregation and secondary phases. However, studies on their exact microstructural evolution at different homogenization temperatures are scarce, especially for complex systems, such as the 2195 Al-Cu-Li alloy. The present work aims to elucidate the microstructural evolution of the 2195 Al-Cu-Li alloy during homogenization, including the dissolution and precipitation behavior of the T<sub>B</sub> (Al<sub>7</sub>Cu<sub>4</sub>Li) phase and S (Al<sub>2</sub>CuMg) phase at different homogenization temperatures. The results show that there are Cu segregation zones (Cu-SZ) at the dendrite boundaries with θ (Al<sub>2</sub>Cu) and S eutectic phases. When the temperature rises from 300 °C to 400 °C, fine T<sub>B</sub> phases precipitate at the Cu-SZ, and the Mg and Ag in the S phases gradually diffuse into the matrix. Upon further increasing the temperature to 450 °C, T<sub>B</sub> and θ phases at the grain boundaries are coarsened, and an S-θ phase transition is observed. Finally, at 500 °C, all T<sub>B</sub> and S phases are dissolved, leaving only θ phases at triangular grain boundaries. This work provides guidance for optimizing the homogenization procedure in 2195 alloys. |
| first_indexed | 2024-03-09T21:32:17Z |
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| id | doaj.art-4715ffd9e6ca45ddbdd2d714ef50d7da |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T21:32:17Z |
| publishDate | 2022-09-01 |
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| spelling | doaj.art-4715ffd9e6ca45ddbdd2d714ef50d7da2023-11-23T20:53:07ZengMDPI AGMaterials1996-19442022-09-011519657310.3390/ma15196573A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during HomogenizationHao Huang0Wei Xiong1Zhen Jiang2Jin Zhang3Light Alloy Research Institute, Central South University, Changsha 410083, ChinaLight Alloy Research Institute, Central South University, Changsha 410083, ChinaLight Alloy Research Institute, Central South University, Changsha 410083, ChinaLight Alloy Research Institute, Central South University, Changsha 410083, ChinaAn optimized homogenization process for Al alloy ingots is key to subsequent material manufacturing, as it largely reduces metallurgical defects, such as segregation and secondary phases. However, studies on their exact microstructural evolution at different homogenization temperatures are scarce, especially for complex systems, such as the 2195 Al-Cu-Li alloy. The present work aims to elucidate the microstructural evolution of the 2195 Al-Cu-Li alloy during homogenization, including the dissolution and precipitation behavior of the T<sub>B</sub> (Al<sub>7</sub>Cu<sub>4</sub>Li) phase and S (Al<sub>2</sub>CuMg) phase at different homogenization temperatures. The results show that there are Cu segregation zones (Cu-SZ) at the dendrite boundaries with θ (Al<sub>2</sub>Cu) and S eutectic phases. When the temperature rises from 300 °C to 400 °C, fine T<sub>B</sub> phases precipitate at the Cu-SZ, and the Mg and Ag in the S phases gradually diffuse into the matrix. Upon further increasing the temperature to 450 °C, T<sub>B</sub> and θ phases at the grain boundaries are coarsened, and an S-θ phase transition is observed. Finally, at 500 °C, all T<sub>B</sub> and S phases are dissolved, leaving only θ phases at triangular grain boundaries. This work provides guidance for optimizing the homogenization procedure in 2195 alloys.https://www.mdpi.com/1996-1944/15/19/6573Al-Cu-Li alloyhomogenizationmicrostructural evolutionquasi in situ |
| spellingShingle | Hao Huang Wei Xiong Zhen Jiang Jin Zhang A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization Materials Al-Cu-Li alloy homogenization microstructural evolution quasi in situ |
| title | A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization |
| title_full | A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization |
| title_fullStr | A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization |
| title_full_unstemmed | A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization |
| title_short | A Quasi In-Situ Study on the Microstructural Evolution of 2195 Al-Cu-Li Alloy during Homogenization |
| title_sort | quasi in situ study on the microstructural evolution of 2195 al cu li alloy during homogenization |
| topic | Al-Cu-Li alloy homogenization microstructural evolution quasi in situ |
| url | https://www.mdpi.com/1996-1944/15/19/6573 |
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