Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging
2219 Al alloy is widely used in the aerospace industry owing to its outstanding properties. In this study, we evaluated the effects of the extrusion temperature and extrusion ratio on the microstructure and mechanical properties of extruded 2219 Al alloy specimens, including the changes during post-...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423007044 |
| _version_ | 1797798825803382784 |
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| author | Shengxiang Wan Heng Su Bin Shao Yingying Zong Debin Shan Bin Guo |
| author_facet | Shengxiang Wan Heng Su Bin Shao Yingying Zong Debin Shan Bin Guo |
| author_sort | Shengxiang Wan |
| collection | DOAJ |
| description | 2219 Al alloy is widely used in the aerospace industry owing to its outstanding properties. In this study, we evaluated the effects of the extrusion temperature and extrusion ratio on the microstructure and mechanical properties of extruded 2219 Al alloy specimens, including the changes during post-extrusion aging. In the extrusion temperature range of 380–500 °C, the mechanical properties of the bar after extrusion at 470 °C were the best. Furthermore, extrusion ratios up to 25:1 produced extruded rods with excellent mechanical properties and microstructure. Increasing the extrusion temperature increased the dissolution of the eutectic θ phase in the solid solution and accelerated the breakage of the inclusions contained Mn/Fe. Some larger and coarse as-cast grains were mechanically fractured during hot extrusion, with the fragments then rotated towards directions with high Schmid factors, thus forming banded dynamic recrystallization regions. The grain boundaries of the recrystallized grains were predominantly low-angle boundaries. The 2219 Al alloy aged at 170 °C for 16 h produced the densest and most uniform distribution of needle-like nanoscale θ′ phase inside the grains, resulting in an average hardness of 149 HV. Further increasing the aging time and temperature resulted in the aggregation and growth of θ′ phase precipitates. |
| first_indexed | 2024-03-13T04:09:42Z |
| format | Article |
| id | doaj.art-c05afef539654ba2b427e4ba85cac00b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-13T04:09:42Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-c05afef539654ba2b427e4ba85cac00b2023-06-21T06:56:25ZengElsevierJournal of Materials Research and Technology2238-78542023-05-012434533463Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion agingShengxiang Wan0Heng Su1Bin Shao2Yingying Zong3Debin Shan4Bin Guo5National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, ChinaCorresponding author.; National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, ChinaCorresponding author.; National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China2219 Al alloy is widely used in the aerospace industry owing to its outstanding properties. In this study, we evaluated the effects of the extrusion temperature and extrusion ratio on the microstructure and mechanical properties of extruded 2219 Al alloy specimens, including the changes during post-extrusion aging. In the extrusion temperature range of 380–500 °C, the mechanical properties of the bar after extrusion at 470 °C were the best. Furthermore, extrusion ratios up to 25:1 produced extruded rods with excellent mechanical properties and microstructure. Increasing the extrusion temperature increased the dissolution of the eutectic θ phase in the solid solution and accelerated the breakage of the inclusions contained Mn/Fe. Some larger and coarse as-cast grains were mechanically fractured during hot extrusion, with the fragments then rotated towards directions with high Schmid factors, thus forming banded dynamic recrystallization regions. The grain boundaries of the recrystallized grains were predominantly low-angle boundaries. The 2219 Al alloy aged at 170 °C for 16 h produced the densest and most uniform distribution of needle-like nanoscale θ′ phase inside the grains, resulting in an average hardness of 149 HV. Further increasing the aging time and temperature resulted in the aggregation and growth of θ′ phase precipitates.http://www.sciencedirect.com/science/article/pii/S22387854230070442219 Al alloyHot extrusionMicrostructureAging heat treatmentDynamic recrystallization |
| spellingShingle | Shengxiang Wan Heng Su Bin Shao Yingying Zong Debin Shan Bin Guo Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging Journal of Materials Research and Technology 2219 Al alloy Hot extrusion Microstructure Aging heat treatment Dynamic recrystallization |
| title | Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging |
| title_full | Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging |
| title_fullStr | Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging |
| title_full_unstemmed | Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging |
| title_short | Changes in microstructure and mechanical properties of 2219 Al alloy during hot extrusion and post-extrusion aging |
| title_sort | changes in microstructure and mechanical properties of 2219 al alloy during hot extrusion and post extrusion aging |
| topic | 2219 Al alloy Hot extrusion Microstructure Aging heat treatment Dynamic recrystallization |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423007044 |
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