The effect of δ-hydride on the micromechanical deformation of a Zr alloy studied by in situ high angular resolution electron backscatter diffraction

SCRIPTA MATERIALIA

卷:173

Article

Wang, Siyang¹  Kalacska, Szilvia²  Maeder, Xavier²  Michler, Johann²  Giuliani, Finn¹  Ben Britton, T.¹ 

[1] Imperial Coll London, Royal Sch Mines, Dept Mat, London SW7 2AZ, England

[2] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, Feuerwerkerstr 39, CH-3602 Thun, Switzerland

关键词: Zirconium alloy;    Zirconium hydride;    Deformation;    Microcantilever test;    Electron backscatter diffraction (EBSD);   

DOI  :  10.1016/j.scriptamat.2019.08.006

来源: Elsevier

【 摘 要 】

Zircaloy-4 (Zr-1.5%Sn-0.2%Fe-0.1%Cr wt%) is used 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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free