In situ mechancial testing of nuclear graphite at elevated temperatrues: Synchrotron X-ray tomography, neutron diffraction and Raman scattering

Dong Liu; Bernd Gludovatz; Harold Barnard; Saurabh Kabra; James Marrow; Martin Kuball; Robert O. Ritchie

In situ mechancial testing of nuclear graphite at elevated temperatrues: Synchrotron X-ray tomography, neutron diffraction and Raman scattering

Dong Liu
, Bernd Gludovatz
, Harold Barnard
, Saurabh Kabra
, James Marrow
, Martin Kuball
, Robert O. Ritchie

Research output: Contribution to conference › Paper › peer-review

Abstract

High temperature in situ tests of Gilsocarbon polygranular nuclear graphite have investigated the microstructure's deformation at two length scales. At the µm-scale, in situ bending tests observed by synchrotron radiation x-ray computed micro-tomography evaluated the bulk mechanical properties of flexural strength and fracture toughness and observed crack propagation at temperatures up to 1000°C; at the atomic-scale, neutron diffraction data correlated the lattice strain with bulk stress at temperatures up to 850°C. Raman scattering observations at temperatures up to 800°C showed the change of micro-scale residual strains. Gilsocarbon graphite was found to have a higher strength and fracture toughness with increased temperature. The mechanism leading to this behaviour has been attributed to the relaxation of residual strains.

Original language	English
Pages	304-305
Number of pages	2
State	Published - 2017
Externally published	Yes
Event	14th International Conference on Fracture, ICF 2017 - Rhodes, Greece Duration: Jun 18 2017 → Jun 20 2017

Conference

Conference	14th International Conference on Fracture, ICF 2017
Country/Territory	Greece
City	Rhodes
Period	06/18/17 → 06/20/17

Funding

DL acknowledges EPSRC Research Fellowship grant (EP/N004493/1) and the Royal Commission for the Exhibition of 1851 Brunel Research Fellowship award. The authors specially acknowledge Dr Claire Acevedo, Dr Dula Parkinson, Dr Yelena Vertyagina, Mr Phil Earp, and Dr James Pomeroy for help with experiments. Access to Engin-X was through number RB1610238.

Cite this

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title = "In situ mechancial testing of nuclear graphite at elevated temperatrues: Synchrotron X-ray tomography, neutron diffraction and Raman scattering",

abstract = "High temperature in situ tests of Gilsocarbon polygranular nuclear graphite have investigated the microstructure's deformation at two length scales. At the µm-scale, in situ bending tests observed by synchrotron radiation x-ray computed micro-tomography evaluated the bulk mechanical properties of flexural strength and fracture toughness and observed crack propagation at temperatures up to 1000°C; at the atomic-scale, neutron diffraction data correlated the lattice strain with bulk stress at temperatures up to 850°C. Raman scattering observations at temperatures up to 800°C showed the change of micro-scale residual strains. Gilsocarbon graphite was found to have a higher strength and fracture toughness with increased temperature. The mechanism leading to this behaviour has been attributed to the relaxation of residual strains.",

author = "Dong Liu and Bernd Gludovatz and Harold Barnard and Saurabh Kabra and James Marrow and Martin Kuball and Ritchie, \{Robert O.\}",

note = "Publisher Copyright: {\textcopyright} 2017 ICF 2017 - 14th International Conference on Fracture. All rights reserved.; 14th International Conference on Fracture, ICF 2017 ; Conference date: 18-06-2017 Through 20-06-2017",

year = "2017",

language = "English",

pages = "304--305",

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TY - CONF

T1 - In situ mechancial testing of nuclear graphite at elevated temperatrues

T2 - 14th International Conference on Fracture, ICF 2017

AU - Liu, Dong

AU - Gludovatz, Bernd

AU - Barnard, Harold

AU - Kabra, Saurabh

AU - Marrow, James

AU - Kuball, Martin

AU - Ritchie, Robert O.

PY - 2017

Y1 - 2017

N2 - High temperature in situ tests of Gilsocarbon polygranular nuclear graphite have investigated the microstructure's deformation at two length scales. At the µm-scale, in situ bending tests observed by synchrotron radiation x-ray computed micro-tomography evaluated the bulk mechanical properties of flexural strength and fracture toughness and observed crack propagation at temperatures up to 1000°C; at the atomic-scale, neutron diffraction data correlated the lattice strain with bulk stress at temperatures up to 850°C. Raman scattering observations at temperatures up to 800°C showed the change of micro-scale residual strains. Gilsocarbon graphite was found to have a higher strength and fracture toughness with increased temperature. The mechanism leading to this behaviour has been attributed to the relaxation of residual strains.

AB - High temperature in situ tests of Gilsocarbon polygranular nuclear graphite have investigated the microstructure's deformation at two length scales. At the µm-scale, in situ bending tests observed by synchrotron radiation x-ray computed micro-tomography evaluated the bulk mechanical properties of flexural strength and fracture toughness and observed crack propagation at temperatures up to 1000°C; at the atomic-scale, neutron diffraction data correlated the lattice strain with bulk stress at temperatures up to 850°C. Raman scattering observations at temperatures up to 800°C showed the change of micro-scale residual strains. Gilsocarbon graphite was found to have a higher strength and fracture toughness with increased temperature. The mechanism leading to this behaviour has been attributed to the relaxation of residual strains.

UR - https://www.scopus.com/pages/publications/85065973272

M3 - Paper

AN - SCOPUS:85065973272

SP - 304

EP - 305

Y2 - 18 June 2017 through 20 June 2017

ER -

In situ mechancial testing of nuclear graphite at elevated temperatrues: Synchrotron X-ray tomography, neutron diffraction and Raman scattering

Abstract

Conference

Funding

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