The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy
The Swift effect of Mg alloy is sensitive to initial texture. However, dislocation slip is the main deformation mechanism during torsion of Mg alloy. The underlying relation of Swift effect and dislocation slip is still not clarified. The effect of stress state and pre-straining on Swift effect was...
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KeAi Communications Co., Ltd.
2023-05-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S221395672100195X |
| _version_ | 1797203822136786944 |
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| author | Chong Yang Guoguo Zhu Hui Zhao Yan Peng Baodong Shi |
| author_facet | Chong Yang Guoguo Zhu Hui Zhao Yan Peng Baodong Shi |
| author_sort | Chong Yang |
| collection | DOAJ |
| description | The Swift effect of Mg alloy is sensitive to initial texture. However, dislocation slip is the main deformation mechanism during torsion of Mg alloy. The underlying relation of Swift effect and dislocation slip is still not clarified. The effect of stress state and pre-straining on Swift effect was studied experimentally during free-end torsion for an extruded AZ31 alloy. The free-end torsion was performed with axial tension and compression stress which is lower than yield stress. It is found that the transition of axial deformation from contraction to elongation occurs when the axial stress changes from negative to positive. The pre-dislocations introduced by pre-tension promote axial shortening during torsion. While the pre-twins introduced by pre-compression are inhibition of axial shortening. The change of axial deformation is attributed to competition between twinning and prismatic slip. The axial shortening of extruded Mg alloy is generated by tensile twinning leading to c-axis strain. In contrast, the axial elongation can be generated by the activation of prismatic slip. The magnitude of axial strain generated by twinning is larger than that by prismatic slip. Moreover, the occurrence of detwinning results in axial elongation at low shear strain. |
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| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-04-24T08:25:26Z |
| publishDate | 2023-05-01 |
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| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-0e478b2d4a344ad3b1ad36844f0a17852024-04-16T22:18:15ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-05-0111516721682The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloyChong Yang0Guoguo Zhu1Hui Zhao2Yan Peng3Baodong Shi4National Engineering Research Center for Equipment and Technology of Cold Rolled Strip, School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR ChinaNational Engineering Research Center for Equipment and Technology of Cold Rolled Strip, School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR ChinaNational Engineering Research Center for Equipment and Technology of Cold Rolled Strip, School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR ChinaNational Engineering Research Center for Equipment and Technology of Cold Rolled Strip, School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR ChinaCorresponding author at: National Engineering Research Center for Equipment and Technology of Cold Rolled Strip, School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR China.; National Engineering Research Center for Equipment and Technology of Cold Rolled Strip, School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR China; State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR ChinaThe Swift effect of Mg alloy is sensitive to initial texture. However, dislocation slip is the main deformation mechanism during torsion of Mg alloy. The underlying relation of Swift effect and dislocation slip is still not clarified. The effect of stress state and pre-straining on Swift effect was studied experimentally during free-end torsion for an extruded AZ31 alloy. The free-end torsion was performed with axial tension and compression stress which is lower than yield stress. It is found that the transition of axial deformation from contraction to elongation occurs when the axial stress changes from negative to positive. The pre-dislocations introduced by pre-tension promote axial shortening during torsion. While the pre-twins introduced by pre-compression are inhibition of axial shortening. The change of axial deformation is attributed to competition between twinning and prismatic slip. The axial shortening of extruded Mg alloy is generated by tensile twinning leading to c-axis strain. In contrast, the axial elongation can be generated by the activation of prismatic slip. The magnitude of axial strain generated by twinning is larger than that by prismatic slip. Moreover, the occurrence of detwinning results in axial elongation at low shear strain.http://www.sciencedirect.com/science/article/pii/S221395672100195XFree-end torsionSwift effectTwinningDislocation slipExtruded magnesium alloy |
| spellingShingle | Chong Yang Guoguo Zhu Hui Zhao Yan Peng Baodong Shi The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy Journal of Magnesium and Alloys Free-end torsion Swift effect Twinning Dislocation slip Extruded magnesium alloy |
| title | The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy |
| title_full | The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy |
| title_fullStr | The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy |
| title_full_unstemmed | The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy |
| title_short | The roles of stress state and pre-straining on Swift effect for an extruded AZ31 Mg alloy |
| title_sort | roles of stress state and pre straining on swift effect for an extruded az31 mg alloy |
| topic | Free-end torsion Swift effect Twinning Dislocation slip Extruded magnesium alloy |
| url | http://www.sciencedirect.com/science/article/pii/S221395672100195X |
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