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Title: Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime
Authors: Yin, Siqi
Zhang, Zhiqiang
Yu, Jiamin
Zhao, Zilong
Liu, Min
Bao, Lei
Jia, Zheng
Cui, Jianzhong
Wang, Ping
Keywords: DRNTU::Engineering::Civil engineering
Mechanical Properties
Metal and Alloys
Issue Date: 2019
Source: 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
Series/Report no.: Scientific Reports
Abstract: 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.
DOI: 10.1038/s41598-018-38420-7
Rights: © 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
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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