Analysis of orientation-dependent deformation mechanisms in additively manufactured Zr using in-situ micromechanical testing: Twinning and orientation gradient

Nitish Bibhanshu, Caleb P. Massey, Jason Harp, Andrew T. Nelson

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Orientation-dependent plasticity in zirconium (Zr)-alloy, which is produced through ultrasonic additive manufacturing (UAM) with subsequent hot-isostatic pressing (HIP), was analyzed by recording electron backscattered diffraction (EBSD) data during in-situ micromechanical testing. Three (0001) plane orientations of a hexagonal close-packed (HCP) structure were analyzed parallel to (1) the rolling direction [X||tensile direction (TD)], (2) the build direction [Z], and (3) the transverse direction [Y]. The analysis revealed that the grains with ∼<0001>||TD show twin-dominant plasticity with three variants from {10 1‾ 2}<1‾ 011>; minor slipping with (101‾ 1)[2‾ 113], and (112‾ 2)[1‾1‾ 23] pyramidal slip has also been observed. However, grains with orientation ∼<0001>⊥TD are mainly sensitive to dislocations assisted plasticity-leading to orientation gradients formation. Furthermore, the neck formation was identified as originating from higher populated micro-crack locations and their association with localized plasticity at defect points in the UAM material. These results demonstrate that minimization of impurities to enable grain growth across prior foil interfaces makes HIP an effective methodology for producing Zr plate, with deformation characteristics expected for conventionally manufactured Zr.

Original languageEnglish
Article number145353
JournalMaterials Science and Engineering: A
Volume882
DOIs
StatePublished - Aug 24 2023

Funding

This manuscript was authored by UT-Battelle LLC under contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE) and supported by the DOE National Nuclear Security Administration, Office of Defense Nuclear Nonproliferation Research and Development. Authors gratefully acknowledge Mark Norfolk and Adam Hehr at Fabrisonic LLC for their help with the building the UAM Zr block. The authors would like to thank Dr. Tyler J. Gerczak (ORNL), Ben Garrison (ORNL), and Dr. X. Chen (ORNL) for reviewing the manuscript and providing valuable comments and suggestions. We also acknowledge the help provided by Dr. M. Gussev with the specimen preparation for the tensile testing. This manuscript was authored by UT-Battelle LLC under contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE) and supported by the DOE National Nuclear Security Administration, Office of Defense Nuclear Nonproliferation Research and Development. Authors gratefully acknowledge Mark Norfolk and Adam Hehr at Fabrisonic LLC for their help with the building the UAM Zr block.

Keywords

  • Additive manufacturing
  • EBSD
  • In-situ micromechanical testing
  • SEM
  • Twinning
  • Zr

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