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arXiv · 1903.11558

The effect of {\delta}-hydride on the micromechanical deformation of Zircaloy-4 studied by in situ high angular resolution electron backscatter diffraction

Siyang Wang·Szilvia Kalácska·Xavier Maeder·Johann Michler·Finn Giuliani·T. Ben Britton
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Abstract

Zircaloy-4 is used extensively as nuclear fuel cladding materials and hydride embrittlement is a major failure mechanism. To explore the effect of {\delta}-hydride on plastic deformation and performance of Zircaloy-4, in situ high angular resolution electron backscatter diffraction (HR-EBSD) was used to quantify stress and geometrically necessary dislocation (GND) density during bending tests of hydride-free and hydride-containing single crystal Zircaloy-4 microcantilevers. Results suggest that while the stress applied was accommodated by plastic slip in the hydride-free cantilever, the hydride-containing cantilever showed precipitation induced GND pile-up at hydride-matrix interface pre-deformation, and considerable locally increasing GND density under tensile stress upon plastic deformation.

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Siyang Wang, Szilvia Kalácska, Xavier Maeder, Johann Michler, Finn Giuliani, T. Ben Britton. 2019-03-27. The effect of {\delta}-hydride on the micromechanical deformation of Zircaloy-4 studied by in situ high angular resolution electron backscatter diffraction. https://arxiv.org/abs/1903.11558

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