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In situ micropillar deformation of hydrides in Zircaloy-4

DOI: 10.1016/j.actamat.2015.03.037 DOI Help

Authors: Hannah Weekes (Imperial College London) , Vassili Vorontsov (Imperial College London) , Igor Dolbnya (Diamond Light Source) , J D Plummer (Imperial College London) , Finn Giuliani (Imperial College London) , Thomas Britton (Imperial College London) , David Dye (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 92 , PAGES 81 - 96

State: Published (Approved)
Published: June 2015
Diamond Proposal Number(s): 7181 , 8179

Abstract: Deformation of hydrided Zircaloy-4 has been examined using in situ loading of hydrided micropillars in the scanning electron microscope and using synchrotron X-ray Laue microbeam diffraction. Results suggest that both the matrix and hydride can co-deform, with storage of deformation defects observed within the hydrides, which were twinned. Hydrides placed at the plane of maximum shear stress showed deformation within the hydride packet, whilst packets in other pillars arrested the propagation of shear bands. X-ray Laue peak broadening, prior to deformation, was associated with the precipitation of hydrides, and during deformation plastic rotation and broadening of both the matrix and hydride peaks were observed. Post-mortem TEM of the deformed pillars has indicated a greater density of dislocations associated with the precipitated hydride packets, while the observed broad- ening of the hydride electron diffraction spots further suggests that plastic strain gradients were induced in the hydrides by compression.

Journal Keywords: Zirconium; Synchrotron Diffraction; Tem; Micromechanics; Hydrides

Subject Areas: Materials, Engineering

Instruments: B16-Test Beamline

Other Facilities: APS, ALS

Added On: 16/04/2015 15:31

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