Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy
The addition of Ca could enhance the ignition point of magnesium alloys but impairing their workability, so it is essential to study the hot deformation behavior of new Ca-containing ignition resistance magnesium alloys. The hot deformation behavior of a new ignition resistance Mg–6Zn-0.6Zr-1.2Ca al...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| author | Shicheng Li Ke Wang Mingliang Li Xiaodong Guo Hongyun Li Jingfeng Wang |
| author_facet | Shicheng Li Ke Wang Mingliang Li Xiaodong Guo Hongyun Li Jingfeng Wang |
| author_sort | Shicheng Li |
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| description | The addition of Ca could enhance the ignition point of magnesium alloys but impairing their workability, so it is essential to study the hot deformation behavior of new Ca-containing ignition resistance magnesium alloys. The hot deformation behavior of a new ignition resistance Mg–6Zn-0.6Zr-1.2Ca alloy was investigated by compression experiment in the temperature range of 240 °C–360 °C, strain rates of 10−3 s−1-1 s−1 and height reduction of 10%–60%. The true stress-strain curves show that flow stress decreases as the deformation temperature increases or the strain rate decreases. Microstructure analysis shows that higher temperatures and lower strain rates are favorable for DRX, while higher strain rates promote the fragmentation of the Ca2Mg6Zn3 phase. Meanwhile, the existence of Ca2Mg6Zn3 phase make the DRX process be dominated by the particle-induced subgrain nucleation mechanism. By superposition of the power dissipation map and the instability map, a hot processing map of true strain of 0.6 is generated. According to analyses on the processing map and microstructure evolution, the instability of processing map can be attributed to the greater dislocation motion resistances, insufficient DRX, and Ca2Mg6Zn3 phase with low-melting point. Conversely, the optimal processing parameters for the alloy were determined as 280–360 °C/0.001–0.01 s−1 in safe zone with a high η above 0.3, which can be due to the apparent DRX and good deformation coordination. |
| format | Article |
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| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| spelling | doaj-art-3c813ff61d0b4e12ace4974fd6eb34e32024-12-26T08:54:59ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013355765586Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloyShicheng Li0Ke Wang1Mingliang Li2Xiaodong Guo3Hongyun Li4Jingfeng Wang5International Joint Laboratory for Light Alloys (MOE), School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaCorresponding author.; International Joint Laboratory for Light Alloys (MOE), School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaInternational Joint Laboratory for Light Alloys (MOE), School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaInternational Joint Laboratory for Light Alloys (MOE), School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaInternational Joint Laboratory for Light Alloys (MOE), School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaInternational Joint Laboratory for Light Alloys (MOE), School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaThe addition of Ca could enhance the ignition point of magnesium alloys but impairing their workability, so it is essential to study the hot deformation behavior of new Ca-containing ignition resistance magnesium alloys. The hot deformation behavior of a new ignition resistance Mg–6Zn-0.6Zr-1.2Ca alloy was investigated by compression experiment in the temperature range of 240 °C–360 °C, strain rates of 10−3 s−1-1 s−1 and height reduction of 10%–60%. The true stress-strain curves show that flow stress decreases as the deformation temperature increases or the strain rate decreases. Microstructure analysis shows that higher temperatures and lower strain rates are favorable for DRX, while higher strain rates promote the fragmentation of the Ca2Mg6Zn3 phase. Meanwhile, the existence of Ca2Mg6Zn3 phase make the DRX process be dominated by the particle-induced subgrain nucleation mechanism. By superposition of the power dissipation map and the instability map, a hot processing map of true strain of 0.6 is generated. According to analyses on the processing map and microstructure evolution, the instability of processing map can be attributed to the greater dislocation motion resistances, insufficient DRX, and Ca2Mg6Zn3 phase with low-melting point. Conversely, the optimal processing parameters for the alloy were determined as 280–360 °C/0.001–0.01 s−1 in safe zone with a high η above 0.3, which can be due to the apparent DRX and good deformation coordination.http://www.sciencedirect.com/science/article/pii/S2238785424024815Mg-Zn-Zr-Ca alloyHot deformation behaviorMicrostructureProcessing map |
| spellingShingle | Shicheng Li Ke Wang Mingliang Li Xiaodong Guo Hongyun Li Jingfeng Wang Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy Journal of Materials Research and Technology Mg-Zn-Zr-Ca alloy Hot deformation behavior Microstructure Processing map |
| title | Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy |
| title_full | Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy |
| title_fullStr | Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy |
| title_full_unstemmed | Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy |
| title_short | Hot deformation behavior of an ignition resistance Mg–6Zn-0.6Zr-1.2Ca magnesium alloy |
| title_sort | hot deformation behavior of an ignition resistance mg 6zn 0 6zr 1 2ca magnesium alloy |
| topic | Mg-Zn-Zr-Ca alloy Hot deformation behavior Microstructure Processing map |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424024815 |
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