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李桂荣,程江峰,王宏明,李超群.静磁场处理对7055铝合金的显微组织和性能的影响[J].稀有金属材料与工程(英文),2019,48(4):1036~1045.[Li Guirong,Cheng Jiangfeng,Wang Hongming and Li Chaoqun.Influence of static magnetic field on the microstructure and properties of 7055 aluminum alloy[J].Rare Metal Materials and Engineering,2019,48(4):1036~1045.]
Influence of static magnetic field on the microstructure and properties of 7055 aluminum alloy
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Received:December 04, 2017  Revised:June 07, 2018
Key words: 7055 alloy  dislocation characteristic  microstructure  mechanical properties  static magnetic field
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目);江苏省研究生创新计划项目;江苏大学科研立项
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Li Guirong,Cheng Jiangfeng,Wang Hongming and Li Chaoqun  
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      In this paper, the mechanical properties and microstructure of 7055 alloy subjected to static magnetic fields at different magnetic induction intensities (B = 0 T, 1 T, 3 T, 5 T and 7 T) were investigated. The dislocation characteristics, phase transitions, tissue textures, tensile properties, fracture morphologies and residual stresses were researched through advanced modern techniques. The results showed that the dislocation densities in the treated samples increased with increasing B, and a transformation of cellular dislocation to the low-energy network dislocation has been observed. In addition, the magnetic field has also played a role in grain refinement due to sub-grain’s formation and facilitating the common η (MgZn2) at grain boundaries to dissolve toward internal grains and transfer into η" phase, which contributes to the enhancement of the tensile strength and toughness of materials. At B = 3 T, the magnetic field weakened the lattice distortion and made a structural adjustment, and material performance arrived at the optimal elongation value 10.5%, residual stress 38 MPa and tensile strength value 555 MPa. Besides, the fracture morphologies were analyzed by Scanning Electronic Microscopy and the fracture characteristics were in agreement with the plasticity property.