Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation
High-temperature flow features of the Al−Zn−Mg−Cu−Zr aluminum alloy was revealed by hot compression tests. The evolution mechanisms of dislocation clusters, subgrain, and dynamic recrystallization (DRX) grains, are thoroughly explored by EBSD and TEM analysis. Experimental results suggest that the h...
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| Format: | Article |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542302015X |
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| author | Daoguang He Han Xie Y.C. Lin Xin-Tao Yan Zhengbing Xu Gang Xiao |
| author_facet | Daoguang He Han Xie Y.C. Lin Xin-Tao Yan Zhengbing Xu Gang Xiao |
| author_sort | Daoguang He |
| collection | DOAJ |
| description | High-temperature flow features of the Al−Zn−Mg−Cu−Zr aluminum alloy was revealed by hot compression tests. The evolution mechanisms of dislocation clusters, subgrain, and dynamic recrystallization (DRX) grains, are thoroughly explored by EBSD and TEM analysis. Experimental results suggest that the high strain rate can exacerbate dislocation clusters formation, as well as subgrain nucleation/accumulation, inducing the increasing of flow stress. Nevertheless, the noticeable annihilation of substructures, as well as the growth of DRX grains, emerge at the higher temperature, causing the descending of flow stress. Three types of DRX nucleating mechanisms, i.e., discontinuous DRX (DDRX), geometric DRX (GDRX) and continuous DRX (CDRX) are activated in the Al−Zn−Mg−Cu−Zr aluminum alloy during hot compression. Simultaneously, the GDRX often appears at a high compressed temperature or a low strain rate. A physically-based (PB) model is proposed to collaboratively reconstruct true stresses and microstructure evolution features. The estimated values of true stress, DRX fractions and average grain size preferably fit the experimental data, indicating the proposed PB model can precisely catch the thermal compression behaviors and microstructure evolution characteristics of the Al−Zn−Mg−Cu−Zr aluminum alloy. |
| first_indexed | 2024-03-11T15:05:59Z |
| format | Article |
| id | doaj.art-a6ec4913e8b54734a3eb7625bfb80b74 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:05:59Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-a6ec4913e8b54734a3eb7625bfb80b742023-10-30T06:03:49ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012647394754Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformationDaoguang He0Han Xie1Y.C. Lin2Xin-Tao Yan3Zhengbing Xu4Gang Xiao5School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Changsha 410083, China; Corresponding author.School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Changsha 410083, ChinaSchool of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Changsha 410083, China; Corresponding author.School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Changsha 410083, ChinaGuangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, Nanning, Guangxi 530004, China; Corresponding author.School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, ChinaHigh-temperature flow features of the Al−Zn−Mg−Cu−Zr aluminum alloy was revealed by hot compression tests. The evolution mechanisms of dislocation clusters, subgrain, and dynamic recrystallization (DRX) grains, are thoroughly explored by EBSD and TEM analysis. Experimental results suggest that the high strain rate can exacerbate dislocation clusters formation, as well as subgrain nucleation/accumulation, inducing the increasing of flow stress. Nevertheless, the noticeable annihilation of substructures, as well as the growth of DRX grains, emerge at the higher temperature, causing the descending of flow stress. Three types of DRX nucleating mechanisms, i.e., discontinuous DRX (DDRX), geometric DRX (GDRX) and continuous DRX (CDRX) are activated in the Al−Zn−Mg−Cu−Zr aluminum alloy during hot compression. Simultaneously, the GDRX often appears at a high compressed temperature or a low strain rate. A physically-based (PB) model is proposed to collaboratively reconstruct true stresses and microstructure evolution features. The estimated values of true stress, DRX fractions and average grain size preferably fit the experimental data, indicating the proposed PB model can precisely catch the thermal compression behaviors and microstructure evolution characteristics of the Al−Zn−Mg−Cu−Zr aluminum alloy.http://www.sciencedirect.com/science/article/pii/S223878542302015XAl–Zn–Mg–Cu–ZrAlloyConstitutive modelMicrostructure evolutionDynamic recrystallization |
| spellingShingle | Daoguang He Han Xie Y.C. Lin Xin-Tao Yan Zhengbing Xu Gang Xiao Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation Journal of Materials Research and Technology Al–Zn–Mg–Cu–Zr Alloy Constitutive model Microstructure evolution Dynamic recrystallization |
| title | Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation |
| title_full | Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation |
| title_fullStr | Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation |
| title_full_unstemmed | Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation |
| title_short | Microstructure evolution mechanisms and a physically-based constitutive model for an Al–Zn–Mg–Cu–Zr aluminum alloy during hot deformation |
| title_sort | microstructure evolution mechanisms and a physically based constitutive model for an al zn mg cu zr aluminum alloy during hot deformation |
| topic | Al–Zn–Mg–Cu–Zr Alloy Constitutive model Microstructure evolution Dynamic recrystallization |
| url | http://www.sciencedirect.com/science/article/pii/S223878542302015X |
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