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Deformation mode-determined misorientation and microstructural characteristics in rolled pure Zr sheet

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Abstract

In this work, commercially pure Zr sheets were subjected to β air cooling and then rolled to different reductions (10% and 50%) at room temperature. Microstructures of both the β-air-cooled and the rolled specimens were well characterized by electron channelling contrast imaging and electron backscatter diffraction techniques, with special attentions paid to their misorientation characteristics. Results show that the β-air-cooled specimen owns a Widmanstätten structure featured by lamellar grains with typical phase transformation misorientations. The 10% rolling allows prismatic slip and tensile twinning ({11-21}<11-2-6> and {10-12}<10-11>) to be activated profusely, which produce new low-angle (~3°–5°) and high-angle (~35° and ~85°) misorientation peaks, respectively. After increasing the rolling reduction to 50%, twinning is suppressed and dislocation slip becomes the dominant deformation mode, with the lamellar grains highly elongated and aligned towards the rolling direction. Meanwhile, only one strong low-angle misorientation peak related to the prismatic slip is presented in the 50%-rolled specimen, with all other peaks disappeared. Analyses on local misorientations reveal that hardly any residual strains exist in the β-air-cooled specimen, which should be related to their sufficient relaxation during slow cooling. Residual strains introduced by 10% rolling are heterogeneously distributed near grain/twin boundaries while heavier deformation (50% rolling) produces much larger residual strains pervasively existing throughout the specimen microstructure.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing, 400054, China

    LinJiang Chai, JiYing Xia, Yan Zhi & YinNing Gou

  2. School of Science, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    LiangYu Chen

  3. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, 066004, China

    ZhiNan Yang

  4. Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China

    Ning Guo

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  1. LinJiang Chai
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  2. JiYing Xia
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  3. Yan Zhi
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  4. YinNing Gou
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  5. LiangYu Chen
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  6. ZhiNan Yang
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  7. Ning Guo
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Correspondence to LinJiang Chai, ZhiNan Yang or Ning Guo.

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Chai, L., Xia, J., Zhi, Y. et al. Deformation mode-determined misorientation and microstructural characteristics in rolled pure Zr sheet. Sci. China Technol. Sci. 61, 1346–1352 (2018). https://doi.org/10.1007/s11431-018-9292-1

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  • DOI: https://doi.org/10.1007/s11431-018-9292-1

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