Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact
The dynamic mechanical behaviors of magnesium alloy components assume paramount importance owing to its involvement in high-speed deformation during the forming process or in extreme service conditions. However, an in-depth exploration of the microscopic deformation mechanisms of rare earth magnesiu...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425002522 |
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| author | Kang Wei Yonghao Zhao Lirong Xiao Yazhou Guo Yi Liu Lei Li Dongdi Yin Hao Zhou |
| author_facet | Kang Wei Yonghao Zhao Lirong Xiao Yazhou Guo Yi Liu Lei Li Dongdi Yin Hao Zhou |
| author_sort | Kang Wei |
| collection | DOAJ |
| description | The dynamic mechanical behaviors of magnesium alloy components assume paramount importance owing to its involvement in high-speed deformation during the forming process or in extreme service conditions. However, an in-depth exploration of the microscopic deformation mechanisms of rare earth magnesium alloys under high strain rates remains relatively scant, especially concerning the intricate relationship between microstructure evolution and dynamic mechanical properties. In this work, we investigate the dynamic compressive properties of extruded fine-grained Mg–5Y alloy subjected to high strain rates ranging from 800 to 2000 s−1, employing Hopkinson impact experiments. We find an enhancement in yield strength from 165 MPa at 800 s−1 to 208 MPa at 2000 s−1, while the compressive strain reaches to 0.21 at 2000 s−1. The calculated strain rate sensitivity factor, denoted by 'm', registers at 0.00795, exhibiting a subdued strain rate sensitivity. Notably, the absence of adiabatic shear bands in the samples attests to their high work hardening capacity, and the ultimate compressive strength reaching an impressive 519 MPa at 2000 s−1. An accelerated strain hardening appears at the middle stage of deformation. A modified constitutive equation tailored for high strain rate deformation at ambient temperatures is established, based upon the Johnson-Cook model. Detailed microstructural analyses reveal that the deformation mechanisms are dominated by deformation multiple twinning, basal <a> dislocations, non-basal dislocations and I1 stacking faults, collectively supporting the high-level strain hardening behavior in Mg–5Y alloys. Our work provides comprehensive insights for the effective utilization of magnesium alloys in high-speed deformation conditions within industrial applications. |
| format | Article |
| id | doaj-art-4b08d55e76584ec5ad386325db48afbd |
| institution | DOAJ |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-4b08d55e76584ec5ad386325db48afbd2025-08-20T03:01:02ZengElsevierJournal of Materials Research and Technology2238-78542025-03-01354249426410.1016/j.jmrt.2025.02.005Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impactKang Wei0Yonghao Zhao1Lirong Xiao2Yazhou Guo3Yi Liu4Lei Li5Dongdi Yin6Hao Zhou7Jiangxi Provincial Key Laboratory of Lightweight Composite Materials, Nanchang Hangkong University, Nanchang, 330063, China; School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, ChinaSchool of Materials Science and Engineering, Hohai University, Changzhou, 213200, China; Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Corresponding author. School of Materials Science and Engineering, Hohai University, Changzhou, 213200, China.yhzhao@njust.edu.cnNano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi'an, 710072, ChinaNano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaNano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaKey Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, ChinaInstitute of Materials Plainification, Liaoning Academy of Materials, Shenyang, 110167, China; Corresponding author. Institute of Materials Plainification, Liaoning Academy of Materials, Shenyang, 110167, China.hzhou@lam.ln.cnThe dynamic mechanical behaviors of magnesium alloy components assume paramount importance owing to its involvement in high-speed deformation during the forming process or in extreme service conditions. However, an in-depth exploration of the microscopic deformation mechanisms of rare earth magnesium alloys under high strain rates remains relatively scant, especially concerning the intricate relationship between microstructure evolution and dynamic mechanical properties. In this work, we investigate the dynamic compressive properties of extruded fine-grained Mg–5Y alloy subjected to high strain rates ranging from 800 to 2000 s−1, employing Hopkinson impact experiments. We find an enhancement in yield strength from 165 MPa at 800 s−1 to 208 MPa at 2000 s−1, while the compressive strain reaches to 0.21 at 2000 s−1. The calculated strain rate sensitivity factor, denoted by 'm', registers at 0.00795, exhibiting a subdued strain rate sensitivity. Notably, the absence of adiabatic shear bands in the samples attests to their high work hardening capacity, and the ultimate compressive strength reaching an impressive 519 MPa at 2000 s−1. An accelerated strain hardening appears at the middle stage of deformation. A modified constitutive equation tailored for high strain rate deformation at ambient temperatures is established, based upon the Johnson-Cook model. Detailed microstructural analyses reveal that the deformation mechanisms are dominated by deformation multiple twinning, basal <a> dislocations, non-basal dislocations and I1 stacking faults, collectively supporting the high-level strain hardening behavior in Mg–5Y alloys. Our work provides comprehensive insights for the effective utilization of magnesium alloys in high-speed deformation conditions within industrial applications.http://www.sciencedirect.com/science/article/pii/S2238785425002522Mg–Y alloyDynamic compressive loadingMechanical propertiesDeformation mechanismsStrain hardeningDislocation slip and twinning |
| spellingShingle | Kang Wei Yonghao Zhao Lirong Xiao Yazhou Guo Yi Liu Lei Li Dongdi Yin Hao Zhou Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact Journal of Materials Research and Technology Mg–Y alloy Dynamic compressive loading Mechanical properties Deformation mechanisms Strain hardening Dislocation slip and twinning |
| title | Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact |
| title_full | Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact |
| title_fullStr | Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact |
| title_full_unstemmed | Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact |
| title_short | Mechanical behavior and deformation mechanisms of Mg–5Y alloy under dynamic compressive impact |
| title_sort | mechanical behavior and deformation mechanisms of mg 5y alloy under dynamic compressive impact |
| topic | Mg–Y alloy Dynamic compressive loading Mechanical properties Deformation mechanisms Strain hardening Dislocation slip and twinning |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425002522 |
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