Journal
RARE METAL MATERIALS AND ENGINEERING
Volume 44, Issue 12, Pages 2943-2948Publisher
NORTHWEST INST NONFERROUS METAL RESEARCH
Keywords
pure zirconium; liquid nitrogen temperature; rolling; texture; twinning
Funding
- National Natural Science Foundation of China [51171213]
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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 C-1 {11 (2) over bar2}<11<(23)over bar>> compressive twins, T-1{10 (1) over bar2}<10<(11)over bar>> and T-2{11 (2) over bar1}<11<(26)over bar>> tensile twins, occur during the rolling and the C-1{11 (2) over bar2}<11<(23)over bar>> 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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