Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding
In this paper, the work hardening and softening behavior of AZ31 magnesium alloy sheets by hard plate accumulative roll bonding (HP-ARB) process in a specific temperature range was studied for the first time, and the cyclic stress relaxation test, EBSD, TEM and other characterization methods were us...
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| Language: | English |
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KeAi Communications Co., Ltd.
2025-07-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956724003372 |
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| author | Lu Sun Feng Li Jia Yang Zhang Wen Tao Niu Mu Zi Cao |
| author_facet | Lu Sun Feng Li Jia Yang Zhang Wen Tao Niu Mu Zi Cao |
| author_sort | Lu Sun |
| collection | DOAJ |
| description | In this paper, the work hardening and softening behavior of AZ31 magnesium alloy sheets by hard plate accumulative roll bonding (HP-ARB) process in a specific temperature range was studied for the first time, and the cyclic stress relaxation test, EBSD, TEM and other characterization methods were used. When the rolling temperature is 350 °C, the grain size of magnesium sheets is refined to 4.32 (±0.36) µm on average, and it shows an excellent combination of strength and plasticity. The tensile strength reaches 307 (±8.52) MPa and the elongation is 12.73 (±0.84)%. At this time, the curve of work hardening rate decreases smoothly and the degree of hardening is the lowest, and the amplitude of stress drop Δσp in work softening test is the smallest with the increase of cycle times, which shows that the well coordination between work hardening and softening behavior has been achieved. Research has found that the combined effect of grain boundary strengthening and fine grain strengthening enhances the yield and tensile strength of magnesium sheets after three passes HP-ARB process at 350 °C. This is attributed to the high degree of dislocation slip opening in the pyramidal surface 〈a〉 and 〈c + a〉, which not only coordinates the c-axis strain of the entire grain, but also promotes the slip transfer of dislocations in the fine-grained region, significantly improving the elongation of the sheets. This study provides a new idea for the forming and manufacturing of high performance magnesium alloy sheets. |
| format | Article |
| id | doaj-art-e26f27db0de640b1bf3e2474b0c6a6ac |
| institution | Kabale University |
| issn | 2213-9567 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-e26f27db0de640b1bf3e2474b0c6a6ac2025-08-20T03:38:24ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672025-07-011373430344910.1016/j.jma.2024.10.003Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bondingLu Sun0Feng Li1Jia Yang Zhang2Wen Tao Niu3Mu Zi Cao4School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, ChinaSchool of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China; Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China; Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification & Green Forming Technology, Harbin University of Science and Technology, Harbin 150040, China; Corresponding authors at: School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China; Corresponding authors at: School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, ChinaSchool of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, ChinaIn this paper, the work hardening and softening behavior of AZ31 magnesium alloy sheets by hard plate accumulative roll bonding (HP-ARB) process in a specific temperature range was studied for the first time, and the cyclic stress relaxation test, EBSD, TEM and other characterization methods were used. When the rolling temperature is 350 °C, the grain size of magnesium sheets is refined to 4.32 (±0.36) µm on average, and it shows an excellent combination of strength and plasticity. The tensile strength reaches 307 (±8.52) MPa and the elongation is 12.73 (±0.84)%. At this time, the curve of work hardening rate decreases smoothly and the degree of hardening is the lowest, and the amplitude of stress drop Δσp in work softening test is the smallest with the increase of cycle times, which shows that the well coordination between work hardening and softening behavior has been achieved. Research has found that the combined effect of grain boundary strengthening and fine grain strengthening enhances the yield and tensile strength of magnesium sheets after three passes HP-ARB process at 350 °C. This is attributed to the high degree of dislocation slip opening in the pyramidal surface 〈a〉 and 〈c + a〉, which not only coordinates the c-axis strain of the entire grain, but also promotes the slip transfer of dislocations in the fine-grained region, significantly improving the elongation of the sheets. This study provides a new idea for the forming and manufacturing of high performance magnesium alloy sheets.http://www.sciencedirect.com/science/article/pii/S2213956724003372Magnesium alloyHard plate accumulative roll bondingRolling temperatureWork hardening and softening behavior |
| spellingShingle | Lu Sun Feng Li Jia Yang Zhang Wen Tao Niu Mu Zi Cao Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding Journal of Magnesium and Alloys Magnesium alloy Hard plate accumulative roll bonding Rolling temperature Work hardening and softening behavior |
| title | Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding |
| title_full | Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding |
| title_fullStr | Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding |
| title_full_unstemmed | Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding |
| title_short | Mechanism of work hardening and softening behavior of AZ31 magnesium alloy sheets with hard plate accumulative roll bonding |
| title_sort | mechanism of work hardening and softening behavior of az31 magnesium alloy sheets with hard plate accumulative roll bonding |
| topic | Magnesium alloy Hard plate accumulative roll bonding Rolling temperature Work hardening and softening behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2213956724003372 |
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