Numerical and Experimental Investigation on Hot Backward Extrusion Process of Mg-Gd-Y-Zn-Zr Magnesium Alloy
| Autor: | Jun Wang, Rong Wang, Guo Ping Ling, Xiu Rong Zhu, Zhi Wen Shao, Yong Dong Xu, Bao Rong Zhao |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Alloy engineering.material Condensed Matter Physics Microstructure Finite element method Mechanics of Materials Ultimate tensile strength engineering General Materials Science Extrusion Deformation (engineering) Magnesium alloy Composite material Stress concentration |
| Zdroj: | Materials Science Forum. 788:127-133 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.788.127 |
| Popis: | The hot backward extrusion process of the Mg-Gd-Y-Zn-Zr magnesium alloy was investigated by both numerical simulation and experiments. An axisymmetric 2D rigid-plastic finite element model (FEM) was established to simulate the material flow during the extrusion process. The shapes of the dies were optimized in order to avoid severe stress concentration and obtain uniform deformation of the workpiece. After hot extrusion, the microstructures of the alloys were obviously refined, and the secondary phases which included many long-period stacking order (LPSO) phases precipitated in the matrix. The optimal comprehensive mechanical properties of the alloy have been obtained after extrusion and ageing at 200°C for 48h with the ultimate tensile strength of 434MPa, tensile yield strength of 375MPa and elongation of 4.5%, respectively. The good mechanical properties were mainly attributed to the fine microstructures and numerous precipitates in the matrix. |
| Databáze: | OpenAIRE |
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