Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys
The alloy composition and aging process are significant factors determining the type of precipitates in Al alloys. In this work, the effects of Mg/Zn ratio and pre-aging process on the microstructure and mechanical properties of Al–Mg–Zn–Cu alloys were systematically investigated using transmission...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423024444 |
| _version_ | 1827346109231529984 |
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| author | Yuqiao Zhao Teng Tian Hailong Jia Pinkui Ma Zhizheng Yang Jin Xu Min Zha Huiyuan Wang |
| author_facet | Yuqiao Zhao Teng Tian Hailong Jia Pinkui Ma Zhizheng Yang Jin Xu Min Zha Huiyuan Wang |
| author_sort | Yuqiao Zhao |
| collection | DOAJ |
| description | The alloy composition and aging process are significant factors determining the type of precipitates in Al alloys. In this work, the effects of Mg/Zn ratio and pre-aging process on the microstructure and mechanical properties of Al–Mg–Zn–Cu alloys were systematically investigated using transmission electron microscopy (TEM), hardness measurements and tensile tests. The results show that reducing the Mg/Zn ratio significantly increases the density of T′-Mg32(AlZnCu)49 precipitates, thereby enhancing and accelerating the aging response. A detailed comparison has been made between Al–Mg–Zn–Cu alloys aged by single-step and two-step artificial aging processes. With the same composition, the alloy exhibits a higher yield strength under the two-stage aging process, resulting from the higher precipitation strengthening effect (Orowan dislocation bypassing mechanism) due to the smaller size and higher density of precipitates. Furthermore, it is particularly interesting that there may be two evolution paths for GPII zones with (111)Al habit plane: one is that the GPII zones are dissolved into the matrix, and the other is that the GPII zones gradually evolve into the T′ precipitates. This work sheds some light on the precipitation sequence in Al–Mg–Zn–Cu alloys and is greatly helpful for designing age-hardening Al–Mg based alloys. |
| first_indexed | 2024-03-07T23:23:25Z |
| format | Article |
| id | doaj.art-048836fa874a4e45940d628eaac2ed2b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:23:25Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj.art-048836fa874a4e45940d628eaac2ed2b2024-02-21T05:25:35ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012718741885Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloysYuqiao Zhao0Teng Tian1Hailong Jia2Pinkui Ma3Zhizheng Yang4Jin Xu5Min Zha6Huiyuan Wang7State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, PR China; Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, PR China; Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR ChinaKey Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, PR China; Corresponding author.Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR ChinaKey Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, PR China; Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR China; International Center of Future Science, Jilin University, Changchun, 130012, PR China; Corresponding author.State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, PR China; Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun, 130025, PR China; International Center of Future Science, Jilin University, Changchun, 130012, PR ChinaThe alloy composition and aging process are significant factors determining the type of precipitates in Al alloys. In this work, the effects of Mg/Zn ratio and pre-aging process on the microstructure and mechanical properties of Al–Mg–Zn–Cu alloys were systematically investigated using transmission electron microscopy (TEM), hardness measurements and tensile tests. The results show that reducing the Mg/Zn ratio significantly increases the density of T′-Mg32(AlZnCu)49 precipitates, thereby enhancing and accelerating the aging response. A detailed comparison has been made between Al–Mg–Zn–Cu alloys aged by single-step and two-step artificial aging processes. With the same composition, the alloy exhibits a higher yield strength under the two-stage aging process, resulting from the higher precipitation strengthening effect (Orowan dislocation bypassing mechanism) due to the smaller size and higher density of precipitates. Furthermore, it is particularly interesting that there may be two evolution paths for GPII zones with (111)Al habit plane: one is that the GPII zones are dissolved into the matrix, and the other is that the GPII zones gradually evolve into the T′ precipitates. This work sheds some light on the precipitation sequence in Al–Mg–Zn–Cu alloys and is greatly helpful for designing age-hardening Al–Mg based alloys.http://www.sciencedirect.com/science/article/pii/S2238785423024444MicrostructureMechanical propertiesAl–Mg–Zn–Cu alloyMg/Zn ratioAging responsePrecipitates |
| spellingShingle | Yuqiao Zhao Teng Tian Hailong Jia Pinkui Ma Zhizheng Yang Jin Xu Min Zha Huiyuan Wang Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys Journal of Materials Research and Technology Microstructure Mechanical properties Al–Mg–Zn–Cu alloy Mg/Zn ratio Aging response Precipitates |
| title | Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys |
| title_full | Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys |
| title_fullStr | Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys |
| title_full_unstemmed | Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys |
| title_short | Effects of Mg/Zn ratio and pre-aging on microstructure and mechanical properties of Al–Mg–Zn–Cu alloys |
| title_sort | effects of mg zn ratio and pre aging on microstructure and mechanical properties of al mg zn cu alloys |
| topic | Microstructure Mechanical properties Al–Mg–Zn–Cu alloy Mg/Zn ratio Aging response Precipitates |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423024444 |
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