Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys
Two Al-Cu-Mg(-Ag) aluminium alloys, having the same base composition of Al-5.11Cu-0.96 Mg-0.58Mn-0.12Zr (wt.%) but different Ag contents, 0 and 0.7 Ag (wt.%), and accordingly denoted 0A and 7A samples, were aged at 185 °C. In early-ageing, the formation of disk-like Mg-Cu and Mg-Ag nano(co–)clusters...
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Elsevier
2023-03-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523001818 |
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| author | Mien-Chung Chen Tsai-Fu Chung Cheng-Ling Tai Yu-Hsuan Chen Jer-Ren Yang Sheng-Long Lee Chien-Nan Hsiao Cheng-Si Tsao Che-Min Chou |
| author_facet | Mien-Chung Chen Tsai-Fu Chung Cheng-Ling Tai Yu-Hsuan Chen Jer-Ren Yang Sheng-Long Lee Chien-Nan Hsiao Cheng-Si Tsao Che-Min Chou |
| author_sort | Mien-Chung Chen |
| collection | DOAJ |
| description | Two Al-Cu-Mg(-Ag) aluminium alloys, having the same base composition of Al-5.11Cu-0.96 Mg-0.58Mn-0.12Zr (wt.%) but different Ag contents, 0 and 0.7 Ag (wt.%), and accordingly denoted 0A and 7A samples, were aged at 185 °C. In early-ageing, the formation of disk-like Mg-Cu and Mg-Ag nano(co–)clusters can be quantitatively examined by Small angle X-ray scattering (SAXS), respectively. In the prolonged ageing of the 0A samples, the thickening in the disk-like θ-precipitates leads to a lower aspect ratio. For S-precipitates, the change in the total surface area and the single-particle surface area indicates that the coalescence mechanism is prevalent from peak-ageing to over-ageing, and then after over-ageing, the precipitate coarsening dominates. The coarsening in S and θ precipitates presumably leads to a lower mechanical strength. Alternatively, in the aged 7A sample, the SAXS technique in conjunction with transmission electron microscopy (TEM) quantitatively reveals Ω-precipitates possessing a nearly constant thickness but an increase in diameter with ageing time. Additionally, the stable behaviors of the total surface and size of S-precipitates illuminate that the coalescence/coarsening mechanisms are significantly slowed down. The concurrently-existing precipitation kinetics of Ω and S have provided an in-depth understanding of the higher strength of the aged 7A sample. |
| first_indexed | 2024-04-09T19:58:19Z |
| format | Article |
| id | doaj.art-2926d4ec012d43709113c1287967760a |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-09T19:58:19Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-2926d4ec012d43709113c1287967760a2023-04-03T05:21:00ZengElsevierMaterials & Design0264-12752023-03-01227111766Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloysMien-Chung Chen0Tsai-Fu Chung1Cheng-Ling Tai2Yu-Hsuan Chen3Jer-Ren Yang4Sheng-Long Lee5Chien-Nan Hsiao6Cheng-Si Tsao7Che-Min Chou8Institute of Material Science and Engineering, National Central University, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan; Corresponding author.Department of Materials Science and Engineering, National Taiwan University, Taipei, TaiwanDepartment of Mechanical Engineering, National Central University, TaiwanDepartment of Materials Science and Engineering, National Taiwan University, Taipei, TaiwanInstitute of Material Science and Engineering, National Central University, Taiwan; Department of Mechanical Engineering, National Central University, Taiwan; Corresponding author.National Applied Research Laboratories, Taiwan Instrument Research Institute, Hsinchu, TaiwanDepartment of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan; Institute of Nuclear Energy Research, Taoyuan, TaiwanNational Synchrotron Radiation Research Center, Hsinchu, TaiwanTwo Al-Cu-Mg(-Ag) aluminium alloys, having the same base composition of Al-5.11Cu-0.96 Mg-0.58Mn-0.12Zr (wt.%) but different Ag contents, 0 and 0.7 Ag (wt.%), and accordingly denoted 0A and 7A samples, were aged at 185 °C. In early-ageing, the formation of disk-like Mg-Cu and Mg-Ag nano(co–)clusters can be quantitatively examined by Small angle X-ray scattering (SAXS), respectively. In the prolonged ageing of the 0A samples, the thickening in the disk-like θ-precipitates leads to a lower aspect ratio. For S-precipitates, the change in the total surface area and the single-particle surface area indicates that the coalescence mechanism is prevalent from peak-ageing to over-ageing, and then after over-ageing, the precipitate coarsening dominates. The coarsening in S and θ precipitates presumably leads to a lower mechanical strength. Alternatively, in the aged 7A sample, the SAXS technique in conjunction with transmission electron microscopy (TEM) quantitatively reveals Ω-precipitates possessing a nearly constant thickness but an increase in diameter with ageing time. Additionally, the stable behaviors of the total surface and size of S-precipitates illuminate that the coalescence/coarsening mechanisms are significantly slowed down. The concurrently-existing precipitation kinetics of Ω and S have provided an in-depth understanding of the higher strength of the aged 7A sample.http://www.sciencedirect.com/science/article/pii/S0264127523001818Aged Al-Cu-Mg(-Ag) aluminium alloysAg additionMultiple precipitate evolutionsTransmission electron microscopySmall angle X-ray scattering |
| spellingShingle | Mien-Chung Chen Tsai-Fu Chung Cheng-Ling Tai Yu-Hsuan Chen Jer-Ren Yang Sheng-Long Lee Chien-Nan Hsiao Cheng-Si Tsao Che-Min Chou Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys Materials & Design Aged Al-Cu-Mg(-Ag) aluminium alloys Ag addition Multiple precipitate evolutions Transmission electron microscopy Small angle X-ray scattering |
| title | Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys |
| title_full | Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys |
| title_fullStr | Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys |
| title_full_unstemmed | Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys |
| title_short | Quantitative evaluation of the effect of Ag-addition on the concurrently-existing precipitation kinetics in the aged Al-Cu-Mg(-Ag) alloys |
| title_sort | quantitative evaluation of the effect of ag addition on the concurrently existing precipitation kinetics in the aged al cu mg ag alloys |
| topic | Aged Al-Cu-Mg(-Ag) aluminium alloys Ag addition Multiple precipitate evolutions Transmission electron microscopy Small angle X-ray scattering |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523001818 |
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