Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys
We investigated the effect of different Cu additions (0.1 wt.% and 0.3 wt.%) on the precipitation activation energy and mechanical properties of Al–Mg–Si alloys under different prestraining levels (0%, 3%, and 5%). Tensile tests were performed before and after paint baking (PB). Differential scannin...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422012704 |
| _version_ | 1811253041826889728 |
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| author | Min Cui Yong Hee Jo Saif Haider Kayani Hyoung-Wook Kim Je-Hyun Lee |
| author_facet | Min Cui Yong Hee Jo Saif Haider Kayani Hyoung-Wook Kim Je-Hyun Lee |
| author_sort | Min Cui |
| collection | DOAJ |
| description | We investigated the effect of different Cu additions (0.1 wt.% and 0.3 wt.%) on the precipitation activation energy and mechanical properties of Al–Mg–Si alloys under different prestraining levels (0%, 3%, and 5%). Tensile tests were performed before and after paint baking (PB). Differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) analyses were conducted to explore the clustering and precipitation behavior. Our results show that the precipitation activation energy was reduced by higher Cu addition but increased with prestraining level. Before PB, higher Cu addition significantly improved the elongation and work-hardening behavior, and the improvement was more pronounced in the prestrained alloys than in the nonprestrained alloys. After PB, higher Cu addition slightly increased the bake hardening response (BHR) of the alloy, and this improvement was enhanced in the prestrained alloys. However, only by introducing an appropriate amount of prestraining (3%) could the high-Cu alloy increase the BHR more significantly than the low-Cu alloy. When 5% prestraining was introduced, the high-Cu alloy had no advantage in increasing the BHR. After the introduction of 3% prestraining, a small amount of pre-Q′ phases was additionally formed near the dislocation lines, but the β″ phase was still the main strengthening phase. Higher Cu addition significantly refined the β″ phase and increased its number density, thereby improving the BHR. The formation of pre-Q′ phases was more pronounced in the high-Cu alloy under 5% prestraining, which suppressed the formation of the β″ phase and limited the BHR. |
| first_indexed | 2024-04-12T16:44:49Z |
| format | Article |
| id | doaj.art-0aeebd8f897f4e13b2bdbaa9988fe602 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-12T16:44:49Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-0aeebd8f897f4e13b2bdbaa9988fe6022022-12-22T03:24:37ZengElsevierJournal of Materials Research and Technology2238-78542022-09-012026292637Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloysMin Cui0Yong Hee Jo1Saif Haider Kayani2Hyoung-Wook Kim3Je-Hyun Lee4Department of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of KoreaMetallic Materials Division, Korea Institute of Materials Science, Changwon 51508, Republic of KoreaMetallic Materials Division, Korea Institute of Materials Science, Changwon 51508, Republic of KoreaMetallic Materials Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea; Corresponding author.Department of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea; Corresponding author.We investigated the effect of different Cu additions (0.1 wt.% and 0.3 wt.%) on the precipitation activation energy and mechanical properties of Al–Mg–Si alloys under different prestraining levels (0%, 3%, and 5%). Tensile tests were performed before and after paint baking (PB). Differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) analyses were conducted to explore the clustering and precipitation behavior. Our results show that the precipitation activation energy was reduced by higher Cu addition but increased with prestraining level. Before PB, higher Cu addition significantly improved the elongation and work-hardening behavior, and the improvement was more pronounced in the prestrained alloys than in the nonprestrained alloys. After PB, higher Cu addition slightly increased the bake hardening response (BHR) of the alloy, and this improvement was enhanced in the prestrained alloys. However, only by introducing an appropriate amount of prestraining (3%) could the high-Cu alloy increase the BHR more significantly than the low-Cu alloy. When 5% prestraining was introduced, the high-Cu alloy had no advantage in increasing the BHR. After the introduction of 3% prestraining, a small amount of pre-Q′ phases was additionally formed near the dislocation lines, but the β″ phase was still the main strengthening phase. Higher Cu addition significantly refined the β″ phase and increased its number density, thereby improving the BHR. The formation of pre-Q′ phases was more pronounced in the high-Cu alloy under 5% prestraining, which suppressed the formation of the β″ phase and limited the BHR.http://www.sciencedirect.com/science/article/pii/S2238785422012704Al–Mg–Si alloyCu additionPrestrainingActivation energyMechanical properties |
| spellingShingle | Min Cui Yong Hee Jo Saif Haider Kayani Hyoung-Wook Kim Je-Hyun Lee Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys Journal of Materials Research and Technology Al–Mg–Si alloy Cu addition Prestraining Activation energy Mechanical properties |
| title | Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys |
| title_full | Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys |
| title_fullStr | Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys |
| title_full_unstemmed | Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys |
| title_short | Effects of Cu additions on the precipitation activation energy and mechanical properties of prestrained Al–Mg–Si alloys |
| title_sort | effects of cu additions on the precipitation activation energy and mechanical properties of prestrained al mg si alloys |
| topic | Al–Mg–Si alloy Cu addition Prestraining Activation energy Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422012704 |
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