Evolution of initial grain boundaries and shear bands in Cu bicrystals during one-pass equal-channel angular pressing
Evolution of initial grain boundaries and shear bands in Cu bicrystals during one-pass equal-channel angular pressing
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DOI：
10.1016/j.actamat.2008.11.001
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发表时间：
2009-02
期刊：
影响因子：
9.4
通讯作者：
W. Han;H. J. Yang;X. An;Ren-fu Yang;Shuzhen Li;Shuaiqin Wu;Zhefeng Zhang
中科院分区：
文献类型：
--
作者：
W. Han;H. J. Yang;X. An;Ren-fu Yang;Shuzhen Li;Shuaiqin Wu;Zhefeng Zhang
采用多种技术系统研究了Cu双晶在一次等径角挤压过程中晶界和剪切带的演变。设计了4个Cu双晶，分别与ECAP模具的交平面（IP）成0°、45°、90°和135°的角。ECAP处理后，由于初始GB方向的不同和组分晶粒特殊的晶体取向，四种双晶的剪切带和GB取向表现出不同的行为。实验结果表明，初始GBs对相邻区域的剪切变形行为有显著影响，远离GBs的变形区域主要受晶体取向控制。本研究进一步证明了沿IP法向的剪切变形在Cu双晶的变形中起重要作用。
The evolution of grain boundaries (GBs) and shear bands in Cu bicrystals during one-pass equal-channel angular pressing (ECAP) was systematically investigated by various techniques. Four Cu bicrystals were designed to make GBs with angles of 0°, 45°, 90° and 135° with respect to the intersection plane (IP) of the ECAP die. After ECAP, the shear bands and the GB orientations in the four bicrystals displayed distinct behaviors due to the difference in the initial GB directions and the special crystallographic orientation of the component grains. Based on the experimental results, it is suggested that the initial GBs have a remarkable influence on the shear deformation behaviors of the adjacent regions, and the deformation regions far from the GBs are mainly controlled by the crystallographic orientations. The present investigations further demonstrate that shear deformation along the normal of the IP plays an important role in the deformation of Cu bicrystals.