In situ micropillar deformation of hydrides in Zircaloy-4

被引：46

作者：

Weekes, H. E. ^{[1
]}

Vorontsov, V. A. ^{[1
]}

Dolbnya, I. P. ^{[2
]}

Plummer, J. D. ^{[1
]}

Giuliani, F. ^{[1
]}

Britton, T. B. ^{[1
]}

Dye, D. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England

[2] Diamond Light Source, Didcot OX11 0DE, Oxon, England

来源：

ACTA MATERIALIA | 2015年 / 92卷

基金：

英国工程与自然科学研究理事会;

关键词：

Zirconium; Synchrotron diffraction; TEM; Micromechanics; Hydrides; POLYCRYSTALLINE ZIRCONIUM HYDRIDES; HYDROGEN EMBRITTLEMENT; PRECIPITATION; DISLOCATIONS; MICRODIFFRACTION; REORIENTATION; DIFFRACTION; FRACTURE;

D O I：

10.1016/j.actamat.2015.03.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 broadening of the hydride electron diffraction spots further suggests that plastic strain gradients were induced in the hydrides by compression. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：81 / 96

页数：16

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