Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling
During the start-stop process of high-precision instruments in service, the critical materials of instruments undergo thermal cycling, resulting in changes in microstructure and dimension. In this paper, the evolution and coupling effects of dislocations and precipitates within 2024 Al alloy during...
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| Format: | Article |
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Elsevier
2024-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423031988 |
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| author | Youfang Cao Longtao Jiang Guwei Shen Deng Gong Jiancun Rao Guoqin Chen |
| author_facet | Youfang Cao Longtao Jiang Guwei Shen Deng Gong Jiancun Rao Guoqin Chen |
| author_sort | Youfang Cao |
| collection | DOAJ |
| description | During the start-stop process of high-precision instruments in service, the critical materials of instruments undergo thermal cycling, resulting in changes in microstructure and dimension. In this paper, the evolution and coupling effects of dislocations and precipitates within 2024 Al alloy during 500 cycles were investigated, and their influence on the dimensional change was quantitatively characterized and decoupling analyzed. Transmission Electron Microscopy (TEM)/aberration-corrected scanning TEM (CS-TEM), X-ray diffraction (XRD), and Three-Dimensional Atom Probe Tomography (3D-APT) were used for microstructural evolution analysis and quantitative statistics. The dislocation density increased from 3.32 × 1014 m−2 to 5.75 × 1014 m−2 after 500 cycles, which accelerated elemental diffusion and provided nucleation sites of precipitates, contributing to an increase in the number density of the S'/S phase from 1.04 × 1024 m−3 to 1.41 × 1024 m−3. Based on the quantitative statistics of precipitate types and corresponding volume fractions, the dimensional change induced by precipitate evolution was −1.25 × 10−4. The dimensional change caused by the free volume introduced by dislocation density was 3.32 × 10−6. Comparing these values with the experimental value of −1.94 × 10−4, it is clear that the precipitate evolution is the main factor that triggers the dimensional change. |
| first_indexed | 2024-03-08T09:28:48Z |
| format | Article |
| id | doaj.art-5c716d166e104d33a2ad1f4c01f22046 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-08T09:28:48Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-5c716d166e104d33a2ad1f4c01f220462024-01-31T05:43:43ZengElsevierJournal of Materials Research and Technology2238-78542024-01-012823132325Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cyclingYoufang Cao0Longtao Jiang1Guwei Shen2Deng Gong3Jiancun Rao4Guoqin Chen5School of Materials and Engineering, Harbin Institute of Technology, Harbin, 150001, ChinaSchool of Materials and Engineering, Harbin Institute of Technology, Harbin, 150001, China; State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001, China; Corresponding author. School of Materials and Engineering, Harbin Institute of Technology, Harbin, 150001, China.School of Materials and Engineering, Harbin Institute of Technology, Harbin, 150001, China; Corresponding author.School of Materials and Engineering, Harbin Institute of Technology, Harbin, 150001, China; Aero Engine Control System Institute, Aero Engine Corporation of China, Wuxi, 214063, ChinaAIM Lab, Maryland NanoCenter, University of Maryland, MD, 20742, USASchool of Materials and Engineering, Harbin Institute of Technology, Harbin, 150001, China; Corresponding author.During the start-stop process of high-precision instruments in service, the critical materials of instruments undergo thermal cycling, resulting in changes in microstructure and dimension. In this paper, the evolution and coupling effects of dislocations and precipitates within 2024 Al alloy during 500 cycles were investigated, and their influence on the dimensional change was quantitatively characterized and decoupling analyzed. Transmission Electron Microscopy (TEM)/aberration-corrected scanning TEM (CS-TEM), X-ray diffraction (XRD), and Three-Dimensional Atom Probe Tomography (3D-APT) were used for microstructural evolution analysis and quantitative statistics. The dislocation density increased from 3.32 × 1014 m−2 to 5.75 × 1014 m−2 after 500 cycles, which accelerated elemental diffusion and provided nucleation sites of precipitates, contributing to an increase in the number density of the S'/S phase from 1.04 × 1024 m−3 to 1.41 × 1024 m−3. Based on the quantitative statistics of precipitate types and corresponding volume fractions, the dimensional change induced by precipitate evolution was −1.25 × 10−4. The dimensional change caused by the free volume introduced by dislocation density was 3.32 × 10−6. Comparing these values with the experimental value of −1.94 × 10−4, it is clear that the precipitate evolution is the main factor that triggers the dimensional change.http://www.sciencedirect.com/science/article/pii/S2238785423031988Aluminum alloyDimensional stabilityThermal cyclingPrecipitateDislocation |
| spellingShingle | Youfang Cao Longtao Jiang Guwei Shen Deng Gong Jiancun Rao Guoqin Chen Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling Journal of Materials Research and Technology Aluminum alloy Dimensional stability Thermal cycling Precipitate Dislocation |
| title | Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling |
| title_full | Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling |
| title_fullStr | Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling |
| title_full_unstemmed | Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling |
| title_short | Quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 Al alloy during long-term thermal cycling |
| title_sort | quantitative study on the microstructural evolution and dimensional stability mechanism of 2024 al alloy during long term thermal cycling |
| topic | Aluminum alloy Dimensional stability Thermal cycling Precipitate Dislocation |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423031988 |
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