METAIS AND METAL MATRIX COMPOSITES |
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Finite Element Simulation of Extrusion Process of ZK60 Magnesium Hollow Profile and Its Microstructure and Properties |
GUO Lili1, YUAN Jingru1, WANG Jianqiang1, LI Yongbing2
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1 Continuous Extrusion Engineering Research Center,Ministry of Education,School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China 2 Beijing National Innovation Institute of Lightweight Ltd.,Beijing 100083,China |
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Abstract In this study, finite element simulation on the extrusion process of the ZK60 magnesium hollow profile was carried out with the aid of HyperXtrude software, and the distributions of temperature, velocity, displacement and strain of the outlet profile were obtained accordingly. As can be observed in the simulation results, the outlet profile showed plane symmetric distribution in temperature and velocity. The temperature declined from the outlet to the extrusion cavity stage by stage. In light of the microstructural investigation, the average grain size of the ZK60 magnesium profile ranged from 8.9 μm to 23.1 μm. The grains on the top surface exhibits the largest mean size, and the smallest sized grains located in the bottom corner, which attributed to differences in the dynamic recrystallization fraction in the ZK60 magnesium alloy caused by the diversity in temperature, velocity, strain and stress in different parts of the profile. The (0002) basal textures of the profile presented 10—15° inclining to the extrusion direction (ED). There was a considerable difference between the top and lateral surface in pole intensity of (0002) texture, with 19.3 in the top surface and 6.9 in the lateral surface. The tensile strength of the profile was about 310 MPa. With regard to the elongation of the profile, the side surface held the highest value of 18.9%, while the top surface exhibited the lowest value of 13.4%. This could be explained by the distribution of the (0002) basal texture towards transverse direction (TD), which reduced the intensity of the basal texture. The low elongation of the top surface is resulted from the comprehensive effect of coarse grains, strong (0002) basal texture and secondary phase distribution.
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Published: 03 January 2020
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About author:: Lili Guoreceived her Ph.D. degree in material processing from Tohoku University in 2011. She is currently an associate professor in Dalian Jiaotong University (DJTU) and participates in the research group of magnesium alloy of continuous extrusion. Her research interests are microstructure and texture analysis in plastic forming of magnesium alloys, finite element simulation and experimental study on continuous extrusion process of magnesium alloy sheet and profile;Yongbing Li, Ph.D., researcher master supervisor, deputy chief engineer of Beijing National Innovation Institute of Lightweight Ltd., general manager of Light Alloy Division, subject leader of State Key Laboratory of Advanced Forming Technology and Equipment, member of board of directors, branch of materials, China Mechanical Engineering Society, editorial board member of Rare Metal Materials and Engineering. His research interests are fabrication of high-performance light alloy material and precision plastic forming technology. He is committed to the ba-sic research work of lightweight materials engineering applications such as aluminum alloy, magnesium alloy, titanium alloy and Ti2AlNb intermetallic compound for the technical needs of automotive, aeronautics, astronautics and other fields. |
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