Microstructural evolution and mechanical properties of Mg-9.8Gd-2.7Y-0.4Zr alloy produced by repetitive upsetting |
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| Authors: | H. Zhou H.Y. Ning X.L. Ma D.D. Yin L.R. Xiao X.C. Sha Y.D. Yu Q.D. Wang Y.S. Li |
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| Affiliation: | 1. Nano and Heterogeneous Materials Center, School of Materials and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China;3. School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin, Heilongjiang 150050, China;4. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;5. Department of Materials Science & Engineering, North Carolina State University, Raleigh, NC 27695, USA;6. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;g. National Engineering Research Center of Light Alloys, Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China |
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| Abstract: | A newly developed severe plastic deformation (SPD) technique, i.e. repetitive upsetting (RU), is employed to improve the strength and ductility of a Mg-Gd-Y-Zr alloy. During the RU processing, dynamic recrystallization occurs in the Mg alloy, which leads to a significant grain refinement from 11.2?μm to 2.8?μm. The yield strength (YS), ultimate tensile strength (UTS) and elongation increase simultaneously with increasing RU passes. The microstructural evolution is affected by processing temperatures. Dynamic recrystallization prevails at low temperatures, while dynamic recovery is the main effect factor at high temperatures. Texture characteristics gradually become random during multiple passes of RU processing, which reduces the tension-compression asymmetry of the Mg-Gd-Y-Zr alloy. |
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| Keywords: | Severe plastic deformation (SPD) Repetitive upsetting (RU) Mg-RE alloy Mechanical properties |
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