Research Progress of Effect of Multi-directional Forging on Microstructure and Properties of Aluminum Alloys
WANG Yunpeng1, HU Jiawei1, XU Xiaoyun1, LIU Daofeng2, JIANG Hongzhang2, WANG Xiaoyong2, YAN Yinbiao1,3
1 School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210014 2 Heilongjiang North Tool Co. Ltd, Mudanjiang 157013 3 Nanjing Supufu Metal Products Co. Ltd, Nanjing 210014
Abstract: Compared with the forging, extrusion and other traditional plastic deformation methods, the strain of the severe plastic deformation(SPD) is large. The SPD has better effects in refining the crystal structure and strengthening the mechanical properties of the alloy, and is widely used in industrial production. And compared with equal channel angular pressing (ECAP), accumulative roll bonding(ARB), and other SPD methods, multi-directional forging(MDF) is more suitable for processing larger bulk materials. MDF has many advantages like its simple mold structure, simple processing and good applicability, which is different from other SPD methods. In recent years, it has been widely researched on the microstructure and properties of aluminum alloys by multi-directional forged (MDFed). There are many influencing factors in the MDF process of aluminum alloy, including initial grain size, temperature, strain rate, friction factor, size and distribution of second phase particles, etc., so the most suitable and systematic parameters are hard to be determined. The refinement mechanisms of the crystal structure and the influence of the second phase particles on the metal structure and properties are complicated during the process of MDF of aluminum alloy. In recent years, researchers have researched the influence of internal factors such as the metal flow and the motivation of the deformation structure, and the environmental factors such as temperature and strain rate on the microstructure and properties of aluminum alloy during the process of MDF. The combination of finite element method (FEM) and SPD process is a hot topic in recent years. The simulation of MDF by FEM can provide a reliable basis for practical research and experiment. It is found that the mechanisms of the crystal refinement are related to the strain in the process of MDF. As the strain increases, the mechanisms of affecting and promoting the refinement of the crystal structures are different; the crystal structures obtained by method of forging three sets of symmetry planes in each pass are better, which is related to the metal flow in the MDF process; the influence of the second phase particles on the microstructure of aluminum alloy is related to temperature in addition to its size and distribution, and the state of the second phase particles changes with increasing temperature, and its effect on the microstructure and properties of aluminum alloy also changes. The MDF refines the crystal structures of aluminum alloy and promotes its uniformity, while the properties such as corrosion resistance, flaking corrosion resistance and superplasticity are also improved. This paper outlines the process of MDF and the research status of the process in aluminum alloy, and analyzes the grain refinement mechanisms of MDF process and its influence on the microstructure and properties of aluminum alloy, finally, discusses the problems still exist in the MDF process and the future research direction.
王云鹏, 胡嘉玮, 许小云, 刘道峰, 蒋洪章, 王晓勇, 颜银标. 多向锻造对铝合金组织与性能影响的研究进展[J]. 材料导报, 2019, 33(13): 2266-2271.
WANG Yunpeng, HU Jiawei, XU Xiaoyun, LIU Daofeng, JIANG Hongzhang, WANG Xiaoyong, YAN Yinbiao. Research Progress of Effect of Multi-directional Forging on Microstructure and Properties of Aluminum Alloys. Materials Reports, 2019, 33(13): 2266-2271.
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2019, Vol. 33 
