The Effect of Loading Direction on Slip and Twinning in an Irradiated Zirconium Alloy

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Abstract

In this study, deformation experiments together with high-resolution digital image correlation were used to quantify the effect of proton irradiation on strain localization in Zircaloy-4 loaded along the rolling and transverse directions. Significant increases in strain heterogeneity were measured in the irradiated material compared to the nonirradiated material. This was a result of confinement of slip to channels in the irradiated material, which contain high effective shear strain values, with almost no strain in the regions between channels. The active slip systems in the material were also determined by comparing experimental slip trace angles from high-resolution digital image correlation with theoretical slip trace angles determined using grain orientation from electron backscatter diffraction. An increased amount of pyramidal and wavy basal slip, as well as tension twinning, were observed in the sample loaded along the transverse direction, compared to the sample loaded along the rolling direction, due to crystallographic texture. No significant change in slip system activity was observed as a result of 0.1 dpa proton irradiation, despite the dramatic change in slip pattern. The findings provide further insight into the role of irradiation on deformation behavior and provide quantitative data on slip system activation, for as-received and irradiated Zircaloy-4, against which to validate models.
Original languageEnglish
Pages233-261
Number of pages29
VolumeSTP1622
Specialist publicationASTM Special Technical Publication
PublisherASTM International
DOIs
Publication statusPublished - 7 Jul 2021

Keywords

  • zirconium
  • slip system
  • EBSD
  • HRDIC
  • Zircaloy-4
  • proton irradiation
  • plasticity
  • dislocation channeling

Research Beacons, Institutes and Platforms

  • Advanced materials
  • Energy

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