Texture evolution and flow stress of columnar-grained polycrystalline copper during intense plastic deformation process at room temperature
Texture evolution and flow stress of columnar-grained polycrystalline copper during intense plastic deformation process at room temperature
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DOI：
10.1016/j.msea.2011.09.105
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发表时间：
2011-12-15
期刊：
影响因子：
6.4
通讯作者：
Xie, Jian-Xin
中科院分区：
文献类型：
--
作者：
Wang, Yu;Huang, Hai-You;Xie, Jian-Xin
用电子背散射衍射仪(EBSD)定量研究了连续柱晶(CCG)多晶铜在室温拉丝过程中的织构演化和微观结构，并根据高分辨率EBSD测量的织构成分和结构参数计算了储能和流动应力。结果表明，原始<；1 0 0>；织构在原始<；1 0 0>；织构中的发展明显慢于等轴多晶铜，如柱状铜中的<；1 1与<；1 0>；组元的体积比在2.98应变时为0.82，而等轴多晶铜中为2.96。柱状晶多晶铜具有较低的<；111>；纤维织构含量和较低的流动应力、较低的加工硬化率和良好的冷塑性延伸性。在所有形变织构成分中，<；1 1>；纤维内部形成的位错胞的平均尺寸最小，并且随着应变的增加而迅速减小，从而导致高的储能、高的流动应力和高的加工硬化率。另一方面，纤维内部形成的位错胞的平均尺寸最大，在高应变下保持较大的值，从而导致低的储能、低的流动应力和低的加工硬化率。(C)2011爱思唯尔B.V.保留所有权利。
The texture evolution and microstructure in continuous columnar-grained (CCG) polycrystalline copper during wire drawing at room temperature were investigated quantitatively using the electron backscatter diffraction (EBSD) technique, and the stored energy and flow stress were calculated based on the texture constitution and structural parameters of different texture components measured by high resolution EBSD. The results indicate that the development of < 1 1 1 > texture within original < 1 0 0 > columnar grains was significantly slower compared with that in equiaxed polycrystalline copper, e.g. the volumetric ratio of the < 1 1 1 > to < 1 0 0 > component in columnar-grain copper was 0.82 at the strain of 2.98, while it was 2.96 in equiaxed polycrystalline copper at the same strain. The relatively low content of < 1 1 1 > fiber texture accounted for the low flow stress, low work hardening rate and excellent cold plastic extensibility of the columnar-grained polycrystalline copper. The average size of the dislocation cells developed within the < 1 1 1 > fiber was the minimum among all the deformation texture components, and decreased rapidly with the increase of strain, leading to a high stored energy, a high flow stress and a high work hardening rate. On the other hand, the average size of the dislocation cells developed within the < 1 0 0 > fiber was the maximum, which held a large value at high strain, leading to a low stored energy, a low flow stress and a low work hardening rate. (C) 2011 Elsevier B.V. All rights reserved.