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

  • LinJiang Chai
  • JiYing Xia
  • Yan Zhi
  • YinNing Gou
  • LiangYu Chen
  • ZhiNan Yang
  • Ning Guo
Article

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.

Keywords

pure Zr rolling misorientation twinning electron backscatter diffraction 

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringChongqing University of TechnologyChongqingChina
  2. 2.School of ScienceJiangsu University of Science and TechnologyZhenjiangChina
  3. 3.National Engineering Research Center for Equipment and Technology of Cold Strip RollingYanshan UniversityQinhuangdaoChina
  4. 4.Faculty of Materials and EnergySouthwest UniversityChongqingChina

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