4D synchrotron X-ray microtomography of fracture in nuclear graphite after neutron irradiation and radiolytic oxidation

被引：18

作者：

Wade-Zhu, J. ^{[1
]}

Krishna, R. ^{[1
]}

Bodey, A. J. ^{[2
]}

Davies, M. ^{[1
,3
]}

Bourne, N. K. ^{[1
]}

Rau, C. ^{[2
]}

Davies, B. ^{[3
]}

Tzelepi, A. ^{[4
]}

Jones, A. N. ^{[1
]}

Marsden, B. J. ^{[1
]}

Mummery, P. M. ^{[1
]}

机构：

[1] Univ Manchester, Dept Mech Aerosp & Civil Engn, Manchester M13 9PL, Lancs, England

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

[3] EDF Nucl Generat Ltd, Gloucester GL4 3R5, England

[4] Natl Nucl Lab, Sellafield CA20 1PG, Cumbria, England

来源：

CARBON | 2020年 / 168卷

基金：

“创新英国”项目; 英国工程与自然科学研究理事会;

关键词：

CRACK-PROPAGATION; THERMAL-EXPANSION; GRAIN GRAPHITE; TOUGHNESS; STRENGTH; DAMAGE; MODULUS; STRAIN; IG-110; MODEL;

D O I：

10.1016/j.carbon.2020.06.051

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Herein, the first study is presented using 4D synchrotron X-ray microtomography to capture all stages of crack development in neutron irradiated and radiolytically oxidised nuclear graphite. Employing a novel loading setup, specimens of Gilsocarbon graphite, both unirradiated and irradiated at 301 degrees C to 19.7 x 10(20) neutrons/cm(2) (similar to 2.6 displacements/atom (dpa)), were loaded to generate a crack. All stages of the fracture process were then captured using synchrotron X-ray imaging. Reconstructed tomographic images and 3D segmented crack volumes have been used to observe and analyse the irradiation-induced evolution of the graphite microstructure as well as corresponding changes in the crack initiation, propagation, and arrest behaviour of graphite after neutron irradiation. Close examination of the applied stress-strain curves highlights the suppression of micro-crack-based damage accumulation in irradiated graphite. Moreover, as well as the crack-bridging and deflection mechanisms characteristic of unirradiated graphite, crack arrest in the irradiated graphite is shown to be significantly influenced by crack tip blunting. This change is associated with the growth of the open pore structure of graphite, specifically the enlargement and increased frequency of macro-pores, resulting from the simultaneous radiolytic oxidation of the graphite microstructure during neutron irradiation. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页码：230 / 244

页数：15

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