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Understanding deformation in polycrystalline metals is critical to use themin high-value high-risk applications. We present in-situ characterisation ofplastic deformation of zirconium, a hexagonal closed packed (HCP), metal.Analysis of plastic deformation is performed using electron backscatterdiffraction (EBSD) to reveal changes in lattice orientation. Throughimplementation of TrueEBSD, we can relate the lattice rotations back to theundeformed reference frame. This enables us to explore which slip systems areactive and the degree of homogeneous (i.e. deformation with respect to theexternal load) and heterogeneous (i.e. deformation with respect to the localgrain neighbourhood). Additionally, from our analysis, we notice that latticerotations consistent with a significant fraction <a> pyramidal slip are found.These results are placed in the context of deformation and performance of HCPalloys and zirconium alloys used as nuclear fuel cladding.

Understanding plasticity in zirconium using in-situ measurement of lattice rotations