Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures
This study successfully develops a novel Al-La-Mg-Fe alloy with a balance of room-temperature and high-temperature mechanical properties through precise control of grain structure and intermetallics via hot extrusion process. The as-extruded Al-La-Mg-Fe alloys achieve enhanced room-temperature mecha...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425012098 |
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| author | Tao Ban Zhi Wang Liejun Li Zhuoran Li Jixiang Gao Xinkui Zhang Zhengwu Peng |
| author_facet | Tao Ban Zhi Wang Liejun Li Zhuoran Li Jixiang Gao Xinkui Zhang Zhengwu Peng |
| author_sort | Tao Ban |
| collection | DOAJ |
| description | This study successfully develops a novel Al-La-Mg-Fe alloy with a balance of room-temperature and high-temperature mechanical properties through precise control of grain structure and intermetallics via hot extrusion process. The as-extruded Al-La-Mg-Fe alloys achieve enhanced room-temperature mechanical properties (UTS: 293 ± 13 MPa, El: 6.6 ± 0.3 %) coupled with remarkable high-temperature strength-ductility synergy (UTS: 158 ± 5 MPa, El: 24.7 ± 3.0 %). The enhanced room-temperature strength-ductility balance originates from the synergistic effects of refined grains, finely dispersed intermetallics, and narrowed intermetallic-free zones, which collectively enhance dislocation motion resistance and promote dislocation accumulation. Moreover, the combined influence of high volume fraction of coarsening-resistant Al11La3 and Al13Fe4 intermetallics and optimized grain boundary density effectively mitigates the detrimental effects of enhanced atomic diffusion and accelerated grain boundary migration at elevated temperatures, resulting in a 54 % strength retention at 300 °C and demonstrating exceptional high-temperature mechanical performance. Additionally, the crack-buffering zones and blunting mechanisms during high-temperature tensile deformation significantly enhance the plasticity of the alloy. These findings establish fundamental principles for the coordinated optimization of grain size and intermetallics in developing heat-resistant aluminum alloys. |
| format | Article |
| id | doaj-art-e364b1069ae449e08a4409e08116ca9f |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-e364b1069ae449e08a4409e08116ca9f2025-08-20T02:28:38ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01367615762710.1016/j.jmrt.2025.05.054Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperaturesTao Ban0Zhi Wang1Liejun Li2Zhuoran Li3Jixiang Gao4Xinkui Zhang5Zhengwu Peng6National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, ChinaNational Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, ChinaNational Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, ChinaNational Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, ChinaGuangdong Polytechnic Normal University, Guangzhou, 510635, ChinaNational Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, China; Corresponding author.National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, China; Corresponding author.This study successfully develops a novel Al-La-Mg-Fe alloy with a balance of room-temperature and high-temperature mechanical properties through precise control of grain structure and intermetallics via hot extrusion process. The as-extruded Al-La-Mg-Fe alloys achieve enhanced room-temperature mechanical properties (UTS: 293 ± 13 MPa, El: 6.6 ± 0.3 %) coupled with remarkable high-temperature strength-ductility synergy (UTS: 158 ± 5 MPa, El: 24.7 ± 3.0 %). The enhanced room-temperature strength-ductility balance originates from the synergistic effects of refined grains, finely dispersed intermetallics, and narrowed intermetallic-free zones, which collectively enhance dislocation motion resistance and promote dislocation accumulation. Moreover, the combined influence of high volume fraction of coarsening-resistant Al11La3 and Al13Fe4 intermetallics and optimized grain boundary density effectively mitigates the detrimental effects of enhanced atomic diffusion and accelerated grain boundary migration at elevated temperatures, resulting in a 54 % strength retention at 300 °C and demonstrating exceptional high-temperature mechanical performance. Additionally, the crack-buffering zones and blunting mechanisms during high-temperature tensile deformation significantly enhance the plasticity of the alloy. These findings establish fundamental principles for the coordinated optimization of grain size and intermetallics in developing heat-resistant aluminum alloys.http://www.sciencedirect.com/science/article/pii/S2238785425012098Al-La-Mg-Fe alloyHot extrusionMechanical propertiesHigh-temperature performance |
| spellingShingle | Tao Ban Zhi Wang Liejun Li Zhuoran Li Jixiang Gao Xinkui Zhang Zhengwu Peng Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures Journal of Materials Research and Technology Al-La-Mg-Fe alloy Hot extrusion Mechanical properties High-temperature performance |
| title | Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures |
| title_full | Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures |
| title_fullStr | Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures |
| title_full_unstemmed | Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures |
| title_short | Tailoring grain and intermetallic of as-extruded Al-La-Mg-Fe alloy: Towards a balance of mechanical properties at room and elevated temperatures |
| title_sort | tailoring grain and intermetallic of as extruded al la mg fe alloy towards a balance of mechanical properties at room and elevated temperatures |
| topic | Al-La-Mg-Fe alloy Hot extrusion Mechanical properties High-temperature performance |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425012098 |
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