Study on Deformation Structure and Texture of Pure Zirconium with Large Grain Size Rolled at Liquid Nitrogen Temperature |
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Authors: | Jian Jie Luan Baifeng Xiao Dongping Zhou Ying Zhou Jun Zhang Jianjun |
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Affiliation: | Chongqing University, Chongqing 400044, China |
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Abstract: | The microstructure and the twinning behavior of the commercial pure zirconium with large grain sizes rolled uniformly at 77 K were studied. The deformation structures and the textures of samples with different rolling reductions were investigated by optical microscopy, scanning electron microscopy, electron backscattering diffraction (EBSD) and X-ray diffractometer. The EBSD results show that three types of twins, including C1{112}<11> compressive twins, T1{102}<10> and T2{111}<11> tensile twins, occur during the rolling and the C1{112}<11> compressive twins are the main twinning type. At the initial stage of the deformation, an amount of twins appear rapidly with only a few low-angle boundaries, indicating that twinning is favorable compared with dislocation slip. As the deformation reduction increases to 30%, however, a large number of low-angle boundaries are produced. It seems that the dislocation slip accommodated by twinning becomes the main deformation mechanism when the deformation reduction reaches approximately 30%. With the increase of the deformation no significant change on the texture type has been observed except slightly reduced intensity |
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Keywords: | pure zirconium liquid nitrogen temperature rolling texture twinning |
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