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,2019,48(4):1036~1045.[Li Guirong,Cheng Jiangfeng,Wang Hongming,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.]
静磁场处理对7055铝合金的显微组织和性能的影响
投稿时间:2017-12-04  修订日期:2018-06-07
中文关键词:  7055铝合金  位错特征  显微组织  力学性能  静磁场
基金项目: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
中文摘要:
      本文研究了不同静磁场强度对7055铝合金显微组织和力学性能的影响,其中,位错特征、相变、织构、拉伸性能、断口形貌和残余应力都用先进检测技术进行了分析。结果表明:试样中的位错密度随着磁感应强度B的增加而呈上升趋势,位错由原来的低能胞状向网络状转变;此外,磁场也促进了晶粒的细化和η (MgZn2) 向η" 的转变,这有益于材料综合性能的提高。当B = 3 T时,磁场弱化了晶粒择优取向且重新调整了晶粒结构,此时,材料获得最优性能,延伸率,残余应力,抗拉强度分别为10.5%,38 MPa,,555MPa。断口形貌也通过扫描电镜进行了分析,其特征与材料塑性增强一致。
Influence of static magnetic field on the microstructure and properties of 7055 aluminum alloy
英文关键词:7055 alloy  dislocation characteristic  microstructure  mechanical properties  static magnetic field
英文摘要:
      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.
作者单位E-mail
李桂荣 江苏大学 864825292@qq.com 
程江峰 江苏大学  
王宏明   
李超群   
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