Microstructure analysis, constitutive relationship, and processing map of novel pre-aged Mg-Zn-Gd-Er alloy with different deformation ranges

Bo Che; Liwei Lu; Lifei Wang; Yan Yang; Fugang Qi; Min Ma; Hongmei Zhao

doi:10.1515/mt-2022-0303

Artikel

Microstructure analysis, constitutive relationship, and processing map of novel pre-aged Mg-Zn-Gd-Er alloy with different deformation ranges

Bo Che
Bo Che received his B.E. degree from Anhui University of Technology, China in 2019 and his M.S. degree from Hunan University of Science and Technology, China in 2022, conducting research under the guidance of Professor Liwei Lu. His research interest is plastic processing, strengthening, and toughening mechaniam of Mg alloy.
, Liwei Lu
Liwei Lu received his B.S. degree from Hunan University of Technology, China in 2006 and his M.S. and Ph.D. degrees from Chongqing University, China in 2008 and 2012, respectively. He has over 70 publications on various aspects of casting, rolling, extrusion, and special extrusion. Currently, he is a professor at Hunan University of Science and Technology, China.
, Lifei Wang
Lifei Wang received his Ph.D. degree from Politecnico di Milano-Chongqing University in 2015. He has published more than 90 journal papers, including more than 80 SCI/EI papers. Currently, he is an associate professor at Taiyuan University of Technology, China.
, Yan Yang
Yan Yang received her Ph.D. from Chongqing University, China in 2013. She has published more than 30 SCI papers. Currently, she is an associate professor at Chongqing University, China.
, Fugang Qi
Fugang Qi received his Ph.D. from Chongqing University, China in 2012. He has published more than 50 academic papers. Currently, he is a professor at Xiangtan University, China.
, Min Ma
Min Ma received his Ph.D. from Yanshan University, China in 2017. He has published more than 20 SCI and EI papers. Currently, he is a postgraduate tutor of Hunan University of Science and Technology.
und Hongmei Zhao
Hongmei Zhao, born in 1970, graduated from North University of China in 2005 with a master’s degree in materials engineering, engaged in powder metallurgy research.

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Abstract

Pre-aged Mg-6Zn-1Gd-1Er alloy is a novel rapid aging hardening Mg alloy, and studying its hot deformation behavior has an important role in promoting the development of lightweight alloy materials. To study this, the flow stress curves of pre-aged Mg-6Zn-1Gd-1Er alloy at 180–380 °C and 10⁻³−10 s⁻¹ were obtained by isothermal compression tests. The constitutive equations of the medium-high temperature deformation (MHTD) and the low-temperature deformation (LTD) were established, and their activation energies were 155.78 kJ mol⁻¹ and 178.00 kJ mol⁻¹, respectively. Based on the constitutive equation analysis, the glide and climb of dislocations and the cross-slip of dislocations was the deformation mechanism during MHTD and LTD, respectively. In order to determine the appropriate hot processing parameters, the hot processing map of the pre-aged Mg-6Zn-1Gd-1Er alloy under 0.2–0.8 strain was constructed based on the dynamic material model. The hot processing maps indicate that this pre-aged alloy at low temperature (180–230 °C) and high strain rates (1–10 s⁻¹) mainly occurs flow instability, and the optimal hot processing window appears at a 330–380 °C and 10⁻³ to 10⁻² s⁻¹ range. Furthermore, the deformation mechanism of the stable domain with high power dissipation efficiency in the hot processing map was continuous dynamic recrystallization, discontinuous dynamic recrystallization, and particle-stimulated nucleation mechanisms.

Keywords: constitutive relationship; dynamic recrystallization; Mg-6Zn-1Gd-1Er alloy; pre-aging treatment; processing map

Corresponding authors: Liwei Lu and Min Ma, Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan, Hunan, 411201, China; and Yan Yang, College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China, E-mail: cqullw@163.com (L. Lu), mma@hnust.edu.cn (M. Ma), yanyang@cqu.edu.cn (Y. Yang)

About the authors

Bo Che

Bo Che received his B.E. degree from Anhui University of Technology, China in 2019 and his M.S. degree from Hunan University of Science and Technology, China in 2022, conducting research under the guidance of Professor Liwei Lu. His research interest is plastic processing, strengthening, and toughening mechaniam of Mg alloy.

Liwei Lu

Liwei Lu received his B.S. degree from Hunan University of Technology, China in 2006 and his M.S. and Ph.D. degrees from Chongqing University, China in 2008 and 2012, respectively. He has over 70 publications on various aspects of casting, rolling, extrusion, and special extrusion. Currently, he is a professor at Hunan University of Science and Technology, China.

Lifei Wang

Lifei Wang received his Ph.D. degree from Politecnico di Milano-Chongqing University in 2015. He has published more than 90 journal papers, including more than 80 SCI/EI papers. Currently, he is an associate professor at Taiyuan University of Technology, China.

Yan Yang

Yan Yang received her Ph.D. from Chongqing University, China in 2013. She has published more than 30 SCI papers. Currently, she is an associate professor at Chongqing University, China.

Fugang Qi

Fugang Qi received his Ph.D. from Chongqing University, China in 2012. He has published more than 50 academic papers. Currently, he is a professor at Xiangtan University, China.

Min Ma

Min Ma received his Ph.D. from Yanshan University, China in 2017. He has published more than 20 SCI and EI papers. Currently, he is a postgraduate tutor of Hunan University of Science and Technology.

Hongmei Zhao

Hongmei Zhao, born in 1970, graduated from North University of China in 2005 with a master’s degree in materials engineering, engaged in powder metallurgy research.

Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant no. 52174362 & 51975207) and Hunan Provincial Natural Science Foundation of China (Grant no. 2020JJ5181).

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare that they have no conflicts of interest.

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Published Online: 2023-03-08

Published in Print: 2023-03-28

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constitutive relationship; dynamic recrystallization; Mg-6Zn-1Gd-1Er alloy; pre-aging treatment; processing map