Inhomogeneous deformation of {111} grain in cold rolled tantalum
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第11期
论文作者：Yahui Liu Shifeng Liu Chao Deng Xiaoli Yuan Qing Liu
文章页码：2178 - 2182
摘 要：The microstructures of {111} grain were characterized in detailed and systematically investigated with the aid of electron backscatter diffraction（EBSD） and transmission electron microscope（TEM）. The stored energy in different regions in the grain was evaluated by the band contrast values collected from EBSD. The results show that the distribution of energy is inhomogeneous through the grain. Especially,the regions containing the least and the largest energy were extracted from the EBSD data, and then quantitatively analyzed based on the misorientation and Schmid factor. Many peaks with large misorientation appeared in the region containing larger energy, and these peaks represent the existences of micro-bands and micro-shear bands in {111} grain. The results of Schmid factor suggest that the region containing larger energy is prone to deforming ahead of the region with less stored energy, implying the more serious subdivision of the microstructure of region with larger stored energy.
Yahui Liu1，Shifeng Liu1,2，Chao Deng1,2，Xiaoli Yuan4，Qing Liu1
1. College of Materials Science and Engineering,Chongqing University2. Electron Microscopy Center of Chongqing University,Chongqing University4. School of Metallurgy and Material Engineering,Chongqing University of Science and Technology
摘 要：The microstructures of {111} grain were characterized in detailed and systematically investigated with the aid of electron backscatter diffraction（EBSD） and transmission electron microscope（TEM）. The stored energy in different regions in the grain was evaluated by the band contrast values collected from EBSD. The results show that the distribution of energy is inhomogeneous through the grain. Especially,the regions containing the least and the largest energy were extracted from the EBSD data, and then quantitatively analyzed based on the misorientation and Schmid factor. Many peaks with large misorientation appeared in the region containing larger energy, and these peaks represent the existences of micro-bands and micro-shear bands in {111} grain. The results of Schmid factor suggest that the region containing larger energy is prone to deforming ahead of the region with less stored energy, implying the more serious subdivision of the microstructure of region with larger stored energy.
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