Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy
This study added a trace amount of Sc element (1 at%) to the Al-Li-Mg-Zn-Cu lightweight high-entropy alloy (LHEA) system. It was found that after minor alloying with Sc, a new strengthening precipitate phase (Al₃Sc) appeared in the alloy, which effectively inhibited grain growth, reducing the averag...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028771 |
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| author | Zhiqiang Li Weili Wang Xuanqi Chen Bo Peng Hui Xing Jieren Yang |
| author_facet | Zhiqiang Li Weili Wang Xuanqi Chen Bo Peng Hui Xing Jieren Yang |
| author_sort | Zhiqiang Li |
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| description | This study added a trace amount of Sc element (1 at%) to the Al-Li-Mg-Zn-Cu lightweight high-entropy alloy (LHEA) system. It was found that after minor alloying with Sc, a new strengthening precipitate phase (Al₃Sc) appeared in the alloy, which effectively inhibited grain growth, reducing the average grain size of Al₈₀Li₅Mg₅ Zn₅Cu₅ from 548.2 μm to 28.4 μm, significantly refining the grain structure. The addition of the Sc element not only improves the mechanical properties of the high-entropy alloy, but it is also found that Sc element is able to provide the alloy with an additional layer of passivation film during the corrosion process, which exhibits more excellent corrosion resistance. To achieve better performance of the Al₈₀Li₅Mg₅Zn₅Cu₄Sc₁ high-entropy alloy, the distribution and size of the precipitate phase and matrix phase were regulated through heat treatment. It was found that after holding at 400 °C for 1 h, the room temperature tensile and compressive strengths of the Sc-containing HEA increased by 68.8% and 63.4%, respectively, compared to the as-cast structure. Furthermore, the room temperature ductility of the Sc-containing high-entropy alloy improved from 0.5% in the as-cast state to 6.8% after holding at 400 °C for 4 h. |
| format | Article |
| id | doaj-art-8bad7e6a08924724855cf234cdbff337 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-8bad7e6a08924724855cf234cdbff3372025-01-19T06:25:18ZengElsevierJournal of Materials Research and Technology2238-78542025-01-013414361448Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloyZhiqiang Li0Weili Wang1Xuanqi Chen2Bo Peng3Hui Xing4Jieren Yang5School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xian, China; Baotou Research Institute of Rare Earths, 014030, Baotou, China; State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, 014030, Baotou, China; Corresponding author. School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xian, China.School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xian, ChinaCollege of Materials Science and Engineering, Sichuan University, 610064, Sichuan, ChinaCollege of Materials Science and Engineering, Sichuan University, 610064, Sichuan, China; Corresponding author.School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xian, ChinaCollege of Materials Science and Engineering, Sichuan University, 610064, Sichuan, ChinaThis study added a trace amount of Sc element (1 at%) to the Al-Li-Mg-Zn-Cu lightweight high-entropy alloy (LHEA) system. It was found that after minor alloying with Sc, a new strengthening precipitate phase (Al₃Sc) appeared in the alloy, which effectively inhibited grain growth, reducing the average grain size of Al₈₀Li₅Mg₅ Zn₅Cu₅ from 548.2 μm to 28.4 μm, significantly refining the grain structure. The addition of the Sc element not only improves the mechanical properties of the high-entropy alloy, but it is also found that Sc element is able to provide the alloy with an additional layer of passivation film during the corrosion process, which exhibits more excellent corrosion resistance. To achieve better performance of the Al₈₀Li₅Mg₅Zn₅Cu₄Sc₁ high-entropy alloy, the distribution and size of the precipitate phase and matrix phase were regulated through heat treatment. It was found that after holding at 400 °C for 1 h, the room temperature tensile and compressive strengths of the Sc-containing HEA increased by 68.8% and 63.4%, respectively, compared to the as-cast structure. Furthermore, the room temperature ductility of the Sc-containing high-entropy alloy improved from 0.5% in the as-cast state to 6.8% after holding at 400 °C for 4 h.http://www.sciencedirect.com/science/article/pii/S2238785424028771Lightweight high-entropy alloyAl₃Sc strengthening precipitate phaseCorrosion resistanceHeat treatment |
| spellingShingle | Zhiqiang Li Weili Wang Xuanqi Chen Bo Peng Hui Xing Jieren Yang Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy Journal of Materials Research and Technology Lightweight high-entropy alloy Al₃Sc strengthening precipitate phase Corrosion resistance Heat treatment |
| title | Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy |
| title_full | Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy |
| title_fullStr | Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy |
| title_full_unstemmed | Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy |
| title_short | Effect of the addition of Sc element on the microstructure and properties of Al80Li5Mg5Zn5Cu5 high-entropy alloy |
| title_sort | effect of the addition of sc element on the microstructure and properties of al80li5mg5zn5cu5 high entropy alloy |
| topic | Lightweight high-entropy alloy Al₃Sc strengthening precipitate phase Corrosion resistance Heat treatment |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028771 |
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