The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys
This study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al–4.5Zn–1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated...
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MDPI AG
2021-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/2/470 |
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| author | Yang-Chun Chiu Tse-An Pan Mien-Chung Chen Jun-Wei Zhang Hui-Yun Bor Sheng-Long Lee |
| author_facet | Yang-Chun Chiu Tse-An Pan Mien-Chung Chen Jun-Wei Zhang Hui-Yun Bor Sheng-Long Lee |
| author_sort | Yang-Chun Chiu |
| collection | DOAJ |
| description | This study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al–4.5Zn–1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated through a hardness test and tensile test. The microstructures were analyzed by an optical microscope (OM), a differential scanning calorimeter (DSC), a transmission electron microscope (TEM), a scanning electron microscope (SEM), and electron backscattered diffraction (EBSD). The results show that the grain refinement effect of the as-cast, homogenized, and recrystallized Al–4.5Zn–1.5Mg alloy containing 0.05Sc (wt%) after the T6 heat treatment was more significant than that of the alloy containing 0.1Zr (wt%). In addition, compared with the aforementioned one-stage homogenization heat treatment, the two-stage homogenization made the dispersed grain phase (Al<sub>3</sub>Zr/Al<sub>3</sub>Sc) smaller. As a result, the T6 mechanical strength of the alloy after the two-stage homogenization heat treatment was better than that of the contrastive alloy after the one-stage homogenization heat treatment. However, the two different homogenization heat treatments caused a greater divergence between the sizes of the dispersed grain phases of the Al–4.5Zn–1.5Mg alloys containing Zr than between the sizes of the dispersed grain phases of the alloys containing Sc. Therefore, after the two-stage homogenization heat treatment, the alloy with 0.1Zr (wt%) promoted the mechanical properties better than the alloy with 0.05Sc (wt%). |
| first_indexed | 2024-03-10T13:26:53Z |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T13:26:53Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-36e8721970984ee3bde0d2787ecc87112023-11-21T08:43:13ZengMDPI AGApplied Sciences2076-34172021-01-0111247010.3390/app11020470The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc AlloysYang-Chun Chiu0Tse-An Pan1Mien-Chung Chen2Jun-Wei Zhang3Hui-Yun Bor4Sheng-Long Lee5Institute of Materials Science and Engineering, National Central University, Jhongli 32001, TaiwanInstitute of Materials Science and Engineering, National Central University, Jhongli 32001, TaiwanInstitute of Materials Science and Engineering, National Central University, Jhongli 32001, TaiwanInstitute of Materials Science and Engineering, National Central University, Jhongli 32001, TaiwanInstitute of Materials Science and Engineering, National Central University, Jhongli 32001, TaiwanInstitute of Materials Science and Engineering, National Central University, Jhongli 32001, TaiwanThis study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al–4.5Zn–1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated through a hardness test and tensile test. The microstructures were analyzed by an optical microscope (OM), a differential scanning calorimeter (DSC), a transmission electron microscope (TEM), a scanning electron microscope (SEM), and electron backscattered diffraction (EBSD). The results show that the grain refinement effect of the as-cast, homogenized, and recrystallized Al–4.5Zn–1.5Mg alloy containing 0.05Sc (wt%) after the T6 heat treatment was more significant than that of the alloy containing 0.1Zr (wt%). In addition, compared with the aforementioned one-stage homogenization heat treatment, the two-stage homogenization made the dispersed grain phase (Al<sub>3</sub>Zr/Al<sub>3</sub>Sc) smaller. As a result, the T6 mechanical strength of the alloy after the two-stage homogenization heat treatment was better than that of the contrastive alloy after the one-stage homogenization heat treatment. However, the two different homogenization heat treatments caused a greater divergence between the sizes of the dispersed grain phases of the Al–4.5Zn–1.5Mg alloys containing Zr than between the sizes of the dispersed grain phases of the alloys containing Sc. Therefore, after the two-stage homogenization heat treatment, the alloy with 0.1Zr (wt%) promoted the mechanical properties better than the alloy with 0.05Sc (wt%).https://www.mdpi.com/2076-3417/11/2/470Al–Zn–Mg alloyzirconiumscandiummulti-stage homogenizationsrecrystallized microstructures |
| spellingShingle | Yang-Chun Chiu Tse-An Pan Mien-Chung Chen Jun-Wei Zhang Hui-Yun Bor Sheng-Long Lee The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys Applied Sciences Al–Zn–Mg alloy zirconium scandium multi-stage homogenizations recrystallized microstructures |
| title | The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys |
| title_full | The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys |
| title_fullStr | The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys |
| title_full_unstemmed | The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys |
| title_short | The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys |
| title_sort | effects of multi stage homogenizations on the microstructures and mechanical properties of al zn mg zr sc alloys |
| topic | Al–Zn–Mg alloy zirconium scandium multi-stage homogenizations recrystallized microstructures |
| url | https://www.mdpi.com/2076-3417/11/2/470 |
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