Journal
ACTA MATERIALIA
Volume 76, Issue -, Pages 213-220Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.04.050
Keywords
Zirconium; Tensile behavior; Deformation twinning; 3-D characterization; nf-HEDM
Funding
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DESC0002001]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- National Science Foundation [DMR080072]
- US Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
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Low-symmetry crystals and polycrystals have anisotropic mechanical properties which, given better understanding of their deformation modes, could lead to development of next generation materials. Understanding how grains in a bulk polycrystal interact will guide and improve material modeling. Here, we show that tensile twins, in hexagonal close-packed metals, form where the macroscopic stress does not generate appropriate shear stress and vice versa. We use non-destructive high-energy X-ray diffraction microscopy to map local crystal orientations in three dimensions in a series of tensile strain states in a zirconium polycrystal. Twins and intragranular orientation variations are observed and it is found that deformation-induced rotations in neighboring grains are spatially correlated with many twins. We conclude that deformation twinning involves complex multigrain interactions which must be included in polycrystal plasticity models. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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