Proton irradiation-induced creep of ultra-fine grain graphite

Anne A. Campbell; Gary S. Was

doi:10.1016/j.carbon.2014.06.016

Proton irradiation-induced creep of ultra-fine grain graphite

Anne A. Campbell, Gary S. Was

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

The objective of this work was to systematically study the effects of applied tensile stress, dose rate, temperature, and accumulated dose on the in situ proton irradiation-induced creep behavior of graphite. Experiments were performed on ultra-fine grain POCO Graphite Inc. ZXF-5Q. The irradiation creep rate exhibited a linear dependence on applied tensile stress, dose rate, and temperature and no dependence on dose to a total accumulated value of 1.0 dpa. These dependencies showed reasonably good agreement with in-reactor creep data. Analysis of the crystal structure and crystallite size parameters following irradiation under load revealed that the most-probable source of structural change is formation of interstitial clusters between basal planes and uncollapsed vacancy lines, in agreement with changes observed for graphite irradiated in-reactor. The parametric dependencies and the change of the lattice parameters, and crystallite dimensions, were compared with dependencies from several potential mechanisms of irradiation-induced creep and revealed, via process of elimination, that Stress-Induced Preferential Absorption (SIPA) is the most likely mechanism to explain irradiation-induced creep in this material.

Original language	English
Pages (from-to)	993-1010
Number of pages	18
Journal	Carbon
Volume	77
DOIs	https://doi.org/10.1016/j.carbon.2014.06.016
State	Published - Oct 2014
Externally published	Yes

Funding

The authors would like to acknowledge the assistance provided by the research staff at the Michigan Ion Beam Laboratory for their assistance with operation of the accelerator. Professor Michael Atzmon for his assistance with understanding and use of the Willamson-Hall methodology. Financial support for this research we provided by the United States Department of Energy under NERI contract # FC07-06ID14732, and Idaho National Laboratory under contract # DE-AC07-05ID14517. Use of the EMAL JEOL 3011 is supported by NSF Grant #DMR-0315633 .

Funders	Funder number
United States Department of Energy
National Science Foundation	-0315633
Idaho National Laboratory	DE-AC07-05ID14517
New England Research Institutes	FC07-06ID14732

Access to Document

10.1016/j.carbon.2014.06.016

Cite this

@article{1ef98ed2ee9d45b48860a281d5f0689a,

title = "Proton irradiation-induced creep of ultra-fine grain graphite",

abstract = "The objective of this work was to systematically study the effects of applied tensile stress, dose rate, temperature, and accumulated dose on the in situ proton irradiation-induced creep behavior of graphite. Experiments were performed on ultra-fine grain POCO Graphite Inc. ZXF-5Q. The irradiation creep rate exhibited a linear dependence on applied tensile stress, dose rate, and temperature and no dependence on dose to a total accumulated value of 1.0 dpa. These dependencies showed reasonably good agreement with in-reactor creep data. Analysis of the crystal structure and crystallite size parameters following irradiation under load revealed that the most-probable source of structural change is formation of interstitial clusters between basal planes and uncollapsed vacancy lines, in agreement with changes observed for graphite irradiated in-reactor. The parametric dependencies and the change of the lattice parameters, and crystallite dimensions, were compared with dependencies from several potential mechanisms of irradiation-induced creep and revealed, via process of elimination, that Stress-Induced Preferential Absorption (SIPA) is the most likely mechanism to explain irradiation-induced creep in this material.",

author = "Campbell, {Anne A.} and Was, {Gary S.}",

year = "2014",

month = oct,

doi = "10.1016/j.carbon.2014.06.016",

language = "English",

volume = "77",

pages = "993--1010",

journal = "Carbon",

issn = "0008-6223",

publisher = "Elsevier",

}

TY - JOUR

T1 - Proton irradiation-induced creep of ultra-fine grain graphite

AU - Campbell, Anne A.

AU - Was, Gary S.

PY - 2014/10

Y1 - 2014/10

N2 - The objective of this work was to systematically study the effects of applied tensile stress, dose rate, temperature, and accumulated dose on the in situ proton irradiation-induced creep behavior of graphite. Experiments were performed on ultra-fine grain POCO Graphite Inc. ZXF-5Q. The irradiation creep rate exhibited a linear dependence on applied tensile stress, dose rate, and temperature and no dependence on dose to a total accumulated value of 1.0 dpa. These dependencies showed reasonably good agreement with in-reactor creep data. Analysis of the crystal structure and crystallite size parameters following irradiation under load revealed that the most-probable source of structural change is formation of interstitial clusters between basal planes and uncollapsed vacancy lines, in agreement with changes observed for graphite irradiated in-reactor. The parametric dependencies and the change of the lattice parameters, and crystallite dimensions, were compared with dependencies from several potential mechanisms of irradiation-induced creep and revealed, via process of elimination, that Stress-Induced Preferential Absorption (SIPA) is the most likely mechanism to explain irradiation-induced creep in this material.

AB - The objective of this work was to systematically study the effects of applied tensile stress, dose rate, temperature, and accumulated dose on the in situ proton irradiation-induced creep behavior of graphite. Experiments were performed on ultra-fine grain POCO Graphite Inc. ZXF-5Q. The irradiation creep rate exhibited a linear dependence on applied tensile stress, dose rate, and temperature and no dependence on dose to a total accumulated value of 1.0 dpa. These dependencies showed reasonably good agreement with in-reactor creep data. Analysis of the crystal structure and crystallite size parameters following irradiation under load revealed that the most-probable source of structural change is formation of interstitial clusters between basal planes and uncollapsed vacancy lines, in agreement with changes observed for graphite irradiated in-reactor. The parametric dependencies and the change of the lattice parameters, and crystallite dimensions, were compared with dependencies from several potential mechanisms of irradiation-induced creep and revealed, via process of elimination, that Stress-Induced Preferential Absorption (SIPA) is the most likely mechanism to explain irradiation-induced creep in this material.

UR - http://www.scopus.com/inward/record.url?scp=84905637542&partnerID=8YFLogxK

U2 - 10.1016/j.carbon.2014.06.016

DO - 10.1016/j.carbon.2014.06.016

M3 - Article

AN - SCOPUS:84905637542

SN - 0008-6223

VL - 77

SP - 993

EP - 1010

JO - Carbon

JF - Carbon

ER -

Proton irradiation-induced creep of ultra-fine grain graphite

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this