Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime
Mg-7Zn-5Gd-0.6Zr (wt%) alloy strengthened with quasicrystal phase (I-Mg3Zn6Gd phase) is prepared through hot extrusion and subsequent heat treatments. The low temperature (range from 25 °C to 250 °C) superplastic deformation behavior of the as-extruded, aging treated (T5) and solution and aging trea...
| Main Authors: | , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/85747 http://hdl.handle.net/10220/48261 |
| _version_ | 1826114260036485120 |
|---|---|
| author | Yin, Siqi Zhang, Zhiqiang Yu, Jiamin Zhao, Zilong Liu, Min Bao, Lei Jia, Zheng Cui, Jianzhong Wang, Ping |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Yin, Siqi Zhang, Zhiqiang Yu, Jiamin Zhao, Zilong Liu, Min Bao, Lei Jia, Zheng Cui, Jianzhong Wang, Ping |
| author_sort | Yin, Siqi |
| collection | NTU |
| description | Mg-7Zn-5Gd-0.6Zr (wt%) alloy strengthened with quasicrystal phase (I-Mg3Zn6Gd phase) is prepared through hot extrusion and subsequent heat treatments. The low temperature (range from 25 °C to 250 °C) superplastic deformation behavior of the as-extruded, aging treated (T5) and solution and aging treated (T6) alloys are investigated. The results reveal that a superior superplastic elongation of 863% is obtained at 250 °C and strain rate of 1.67 × 10−3 s−1 and the elongation of this alloy increases with the increasing tensile temperature. Detailed microstructural analyses show that I-Mg3Zn6Gd phase and W-Mg3Gd2Zn3 phase are crushed into small particles during extrusion. A high density of nanoscale I-phase precipitates after T5 treatment. Dynamic recrystallization occurs in as-extruded Mg-7Zn-5Gd-0.6Zr alloy. The T5-treated Mg-7Zn-5Gd-0.6Zr alloy shows a relatively weak basal texture intensity, a large number fraction of high angle boundaries and a very finer grain structure (3.01 μm). During superplastic deformation, the nanoscale I-phase is slightly elongated and the microstructure is still equiaxed grains. The superplastic mechanism of the alloy is grain boundary sliding (GBS) accommodated by dislocation movement and static recrystallization. The cavity nucleation at the nanoscale I-phase/α-Mg matrix boundaries or grain boundaries and the cavity stringer formation leads to final fracture. |
| first_indexed | 2024-10-01T03:36:34Z |
| format | Journal Article |
| id | ntu-10356/85747 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:36:34Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/857472020-03-07T11:43:35Z Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime Yin, Siqi Zhang, Zhiqiang Yu, Jiamin Zhao, Zilong Liu, Min Bao, Lei Jia, Zheng Cui, Jianzhong Wang, Ping School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering Mechanical Properties Metal and Alloys Mg-7Zn-5Gd-0.6Zr (wt%) alloy strengthened with quasicrystal phase (I-Mg3Zn6Gd phase) is prepared through hot extrusion and subsequent heat treatments. The low temperature (range from 25 °C to 250 °C) superplastic deformation behavior of the as-extruded, aging treated (T5) and solution and aging treated (T6) alloys are investigated. The results reveal that a superior superplastic elongation of 863% is obtained at 250 °C and strain rate of 1.67 × 10−3 s−1 and the elongation of this alloy increases with the increasing tensile temperature. Detailed microstructural analyses show that I-Mg3Zn6Gd phase and W-Mg3Gd2Zn3 phase are crushed into small particles during extrusion. A high density of nanoscale I-phase precipitates after T5 treatment. Dynamic recrystallization occurs in as-extruded Mg-7Zn-5Gd-0.6Zr alloy. The T5-treated Mg-7Zn-5Gd-0.6Zr alloy shows a relatively weak basal texture intensity, a large number fraction of high angle boundaries and a very finer grain structure (3.01 μm). During superplastic deformation, the nanoscale I-phase is slightly elongated and the microstructure is still equiaxed grains. The superplastic mechanism of the alloy is grain boundary sliding (GBS) accommodated by dislocation movement and static recrystallization. The cavity nucleation at the nanoscale I-phase/α-Mg matrix boundaries or grain boundaries and the cavity stringer formation leads to final fracture. Published version 2019-05-17T06:24:32Z 2019-12-06T16:09:31Z 2019-05-17T06:24:32Z 2019-12-06T16:09:31Z 2019 Journal Article Yin, S., Zhang, Z., Yu, J., Zhao, Z., Liu, M., Bao, L., . . . Wang, P. (2019). Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime. Scientific Reports, 9, 4365-. doi:10.1038/s41598-018-38420-7 https://hdl.handle.net/10356/85747 http://hdl.handle.net/10220/48261 10.1038/s41598-018-38420-7 en Scientific Reports © 2019 The Author(s) (Nature Publishing Group). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. 14 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering Mechanical Properties Metal and Alloys Yin, Siqi Zhang, Zhiqiang Yu, Jiamin Zhao, Zilong Liu, Min Bao, Lei Jia, Zheng Cui, Jianzhong Wang, Ping Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime |
| title | Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime |
| title_full | Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime |
| title_fullStr | Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime |
| title_full_unstemmed | Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime |
| title_short | Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime |
| title_sort | achieving excellent superplasticity of mg 7zn 5gd 0 6zr alloy at low temperature regime |
| topic | DRNTU::Engineering::Civil engineering Mechanical Properties Metal and Alloys |
| url | https://hdl.handle.net/10356/85747 http://hdl.handle.net/10220/48261 |
| work_keys_str_mv | AT yinsiqi achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT zhangzhiqiang achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT yujiamin achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT zhaozilong achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT liumin achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT baolei achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT jiazheng achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT cuijianzhong achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime AT wangping achievingexcellentsuperplasticityofmg7zn5gd06zralloyatlowtemperatureregime |