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Deformation behavior and microstructure evolution of pure Cu subjected to electromagnetic bulging

机译：纯铜在电磁鼓胀下的变形行为和组织演变

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摘要

In this paper, pure Cu sheet with thickness of 1 mm was electromagnetically budged to form a conical shape workpiece. The deformation behavior and the microstructural evolution of the Cu sheet under electromagnetic bulging were systematically studied using strain analysis, optical microscopy (OM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). It is found that the strain distribution in the workpiece is quite un-uniform from the bottom to the top due to the inhomogeneous electromagnetic pressure generated by the spiral coil. The characterization of micro-structure reveals that the bulge deformation of the Cu sheet is governed by dislocation multiple slip and cross slip, which cause finally the formation of cell structures. However, the size and the boundary width of cells are closely related to the plastic strain, i.e., the cell size and boundary width decrease with increasing strain. In addition, low misorientation angle of cells inside the grains increases with increasing strain. This structural evolution is discussed on the basis of the low energy dislocation structures (LEDS) theory.
机译：在本文中，将厚度为1 mm的纯Cu板电磁辐射形成圆锥形工件。利用应变分析，光学显微镜（OM），电子背散射衍射（EBSD）和透射电子显微镜（TEM），系统研究了铜鼓在电磁鼓胀下的变形行为和组织演变。发现由于螺旋线圈产生的不均匀的电磁压力，工件的应变分布从底部到顶部是非常不均匀的。微观结构的表征表明，Cu板的隆起变形受位错多重滑移和交叉滑移的控制，最终导致单元结构的形成。然而，孔的尺寸和边界宽度与塑性应变密切相关，即，孔的尺寸和边界宽度随着应变的增加而减小。另外，晶粒内部的低取向差角随着应变的增加而增加。在低能位错结构（LEDS）理论的基础上讨论了这种结构演变。

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  • 来源
    《Materials Science and Engineering》 |2014年第21期|127-135|共9页
  • 作者

    H.W. Jiang; N. Li; Y.Y. Xiong; Z.G. Li; L.Liu;

  • 作者单位

    School of Materials Science and Engineering and State Key Lab of Materials Processing and Die & Mould technology, Huazhong University of Science and Technology, 430074 Wuhan, China;

    School of Materials Science and Engineering and State Key Lab of Materials Processing and Die & Mould technology, Huazhong University of Science and Technology, 430074 Wuhan, China;

    School of Materials Science and Engineering and State Key Lab of Materials Processing and Die & Mould technology, Huazhong University of Science and Technology, 430074 Wuhan, China;

    School of Materials Science and Engineering and State Key Lab of Materials Processing and Die & Mould technology, Huazhong University of Science and Technology, 430074 Wuhan, China;

    School of Materials Science and Engineering and State Key Lab of Materials Processing and Die & Mould technology, Huazhong University of Science and Technology, 430074 Wuhan, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Electromagnetic forming; Dislocation and dislocation cells; Micro-orientation; Deformation mechanism;

    机译：电磁成型;脱位和脱位细胞;微观取向变形机制;

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