THERMAL DEFORMATION BEHAVIOR OF HIGH-PURITY RARE EARTH METAL DYSPROSIUM

Haishuang Lv; Yanmei Li; Dounan Chen; Guohuai Liu; Rui Liu; Zhaodong Wang

doi:10.17222/mit.2024.1115

Haishuang Lv The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Yanmei Li The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Dounan Chen Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Guohuai Liu The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Rui Liu The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Zhaodong Wang The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

DOI: https://doi.org/10.17222/mit.2024.1115

Keywords: dysprosium, hot deformation behavior, stress-strain curve, processing maps

Abstract

High-purity rare earth metal dysprosium was subjected to a single-pass thermal compression test at temperatures ranging from 300 °C to 700 °C and strain rates ranging from 0.1 s^–1 to 10 s^–1 using an MMS-200 thermal simulation testing machine. The true stress-strain curves, macro and microstructure of dysprosium were analyzed, leading to the establishment of processing maps and constitutive equation for dysprosium. Results revealed that the stress of dysprosium decreased with increasing deformation temperature and decreasing strain rate. Moreover, as the strain rate reached 5 s^–1, the stress-strain curve gradually transitioned from dynamic recovery to dynamic recrystallization, with a more pronounced softening behavior observed at higher strain rates. Based on the processing diagram and sample microstructure analysis, it was determined that the optimal deformation range for dysprosium is between 350 °C and 500 °C at a strain rate of 1–10 s^–1.

References

1. D. Wu, Z. Wang, D. Chen, et al, Research progress in preparation technology of high purity rare earth metals and alloy targets, Proceedings of the 2020 Academic Annual Meeting of the Chinese Society of Rare Earth and the Jiangxi (Ganzhou) Conference on Green Development and Efficient Utilization of Rare Earth Resources, 2020, 49-49
2. Y. Wang, J. Gao, W. Li, et al, Study on thermal deformation behavior of Mg-Y-Nd-Zr rare earth magnesium alloys, 2008 Annual meeting of Chinese Mechanical Engineering Society and Gansu Province academic annual conference, 2008
3. R. Ding, J. Zhou, X. Li, et. al, Study on high temperature rheological behavior and hot working diagram of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy, Forging and Stamping Technology, 2019, 44(3):7, doi: 10.13330/j.issn.1000-3940.2019.03.021
4. H. Wu, et al, Hot deformation behavior and constitutive equation of a new type Al-Zn-Mg-Er-Zr alloy during isothermal compression, Mater. Sci. Eng., A. Structural Materials: Properties, Microstructure and Processing, 2016, 651:415-424, doi: 10.1016/j.msea.2015.10.122
5. W. Yao, et al, Hot Deformation Behavior and Microstructural Evolution of the As-rolled 7050Al Alloy, Mater. Today. Commun., 2024, 38:107861, doi: 10.1016/j.mtcomm.2023.107861
6. H. Mirzadeh, Constitutive modeling and prediction of hot deformation flow stress under dynamic recrystallization conditions, Mech. Mater., 2015,85: 66-79, doi: 10.1016/j.mechmat.2015.02.014
7. A. Hunter, et al, Analytic model of dislocation density evolution in fcc polycrystals accounting for dislocation generation, storage, and dynamic recovery mechanisms, Int. J. Plast., 2022, 151:103178, doi: 10.1016/j.ijplas.2021.103178
8. M. Rajamuthamilselvan, S. Ramanathan, Hot deformation behaviour of 7075 alloy, J. Alloys Compd., 2011, 509(3):948-952, doi: 10.1016/j.jallcom.2010.09.139
9. C. Zhang, C. Wang, R. Guo, et al, Investigation of dynamic recrystallization and modeling of microstructure evolution of an Al-Mg-Si aluminum alloy during high-temperature deformation, J. Alloys Compd., 2018, 773:59-70, doi: 10.1016/j.jallcom.2018.09.263
10. A. Tekkaya, et al, Metal forming beyond shaping: Predicting and setting product properties, CIRP Annals, 2015, 64(2):629-653, doi: 10.1016/j.cirp.2015.05.001
11. T. Li, Sheet Preparation Technology, Microstructure and Properties of Hot-pack Rolling Ti-44Al-5Nb-1Mo-2V-0.2B Alloys, Northeastern University, 2021
12. Q. Jiang, Temperature effect on plastic deformation and damage behavior of ultra-fine crystalline pure metal materials, Northeastern University, 2011