Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps
High-temperature compression tests with dual-phase Mg-6Li alloy were conducted on the Gleeble-3500 thermal-mechanical simulator. Flow stress and micro-structure evolution were analyzed for temperatures (T = 423, 473,523 and 573 K) and strain rates (<inline-formula><math xmlns="http://w...
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MDPI AG
2021-06-01
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| author | Guo Li Xingyu Bai Qiang Peng Guobing Wei Zhenduo Ma |
| author_facet | Guo Li Xingyu Bai Qiang Peng Guobing Wei Zhenduo Ma |
| author_sort | Guo Li |
| collection | DOAJ |
| description | High-temperature compression tests with dual-phase Mg-6Li alloy were conducted on the Gleeble-3500 thermal-mechanical simulator. Flow stress and micro-structure evolution were analyzed for temperatures (T = 423, 473,523 and 573 K) and strain rates (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo></mrow></semantics></math></inline-formula>0.001, 0.01, 0.1 and 1 s<sup>−1</sup>). On this basis, the constitutive model and hot processing maps were established. Besides, the dynamic re-crystallization (DRX) of α-Mg phase, grain orientation and texture composition under different deformation conditions were analyzed by EBSD technology. The experimental results show that the flow stress of Mg-6Li alloy increased with decreasing deformation temperature and increasing strain rate. In addition, the range of instability zone expanded with the increase of strain. The optimal thermal processing temperature was found to be in the range of 500 K–573 K, and the optimal strain rates were between 0.01 s<sup>−1</sup>–1 s<sup>−1</sup>. Model-predicted stress values were compared with experimental values for model verification. The 0.9954 correlation coefficient and the 5.48% average absolute relative error shown by the calculation indicate an acceptable accuracy of the model in predicting thermal deformation behavior of Mg-6Li alloy. Moreover, based on our EBSD data and maps analysis, the DRX proportion of α-Mg phase in Mg-6Li alloy was relatively low, and α-Mg phase formed <0001>//CD basal texture. |
| first_indexed | 2024-03-10T10:45:14Z |
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| last_indexed | 2024-03-10T10:45:14Z |
| publishDate | 2021-06-01 |
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| series | Metals |
| spelling | doaj.art-c97dc9f89208481b8ad1699ebcd2515e2023-11-21T22:41:45ZengMDPI AGMetals2075-47012021-06-0111691110.3390/met11060911Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing MapsGuo Li0Xingyu Bai1Qiang Peng2Guobing Wei3Zhenduo Ma4International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing 400044, ChinaInternational Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing 400044, ChinaInternational Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing 400044, ChinaInternational Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing 400044, ChinaInternational Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing 400044, ChinaHigh-temperature compression tests with dual-phase Mg-6Li alloy were conducted on the Gleeble-3500 thermal-mechanical simulator. Flow stress and micro-structure evolution were analyzed for temperatures (T = 423, 473,523 and 573 K) and strain rates (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo></mrow></semantics></math></inline-formula>0.001, 0.01, 0.1 and 1 s<sup>−1</sup>). On this basis, the constitutive model and hot processing maps were established. Besides, the dynamic re-crystallization (DRX) of α-Mg phase, grain orientation and texture composition under different deformation conditions were analyzed by EBSD technology. The experimental results show that the flow stress of Mg-6Li alloy increased with decreasing deformation temperature and increasing strain rate. In addition, the range of instability zone expanded with the increase of strain. The optimal thermal processing temperature was found to be in the range of 500 K–573 K, and the optimal strain rates were between 0.01 s<sup>−1</sup>–1 s<sup>−1</sup>. Model-predicted stress values were compared with experimental values for model verification. The 0.9954 correlation coefficient and the 5.48% average absolute relative error shown by the calculation indicate an acceptable accuracy of the model in predicting thermal deformation behavior of Mg-6Li alloy. Moreover, based on our EBSD data and maps analysis, the DRX proportion of α-Mg phase in Mg-6Li alloy was relatively low, and α-Mg phase formed <0001>//CD basal texture.https://www.mdpi.com/2075-4701/11/6/911Mg-6Li alloyconstitutive relationshipprocessing maptexture evolution |
| spellingShingle | Guo Li Xingyu Bai Qiang Peng Guobing Wei Zhenduo Ma Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps Metals Mg-6Li alloy constitutive relationship processing map texture evolution |
| title | Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps |
| title_full | Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps |
| title_fullStr | Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps |
| title_full_unstemmed | Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps |
| title_short | Hot Deformation Behavior of Ultralight Dual-Phase Mg-6li Alloy: Constitutive Model and Hot Processing Maps |
| title_sort | hot deformation behavior of ultralight dual phase mg 6li alloy constitutive model and hot processing maps |
| topic | Mg-6Li alloy constitutive relationship processing map texture evolution |
| url | https://www.mdpi.com/2075-4701/11/6/911 |
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