Modeling irradiation creep of graphite using rate theory

Apu Sarkar; Jacob Eapen; Anant Raj; K. L. Murty; T. D. Burchell

doi:10.1016/j.jnucmat.2016.01.036

Modeling irradiation creep of graphite using rate theory

Apu Sarkar
, Jacob Eapen
, Anant Raj
, K. L. Murty
, T. D. Burchell

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

9 Scopus citations

Abstract

We have examined irradiation induced creep of graphite in the framework of transition state rate theory. Experimental data for two grades of nuclear graphite (H-337 and AGOT) have been analyzed to determine the stress exponent (n) and activation energy (Q) for plastic flow under irradiation. We show that the mean activation energy lies between 0.14 and 0.32 eV with a mean stress-exponent of 1.0 ± 0.2. A stress exponent of unity and the unusually low activation energies strongly indicate a diffusive defect transport mechanism for neutron doses in the range of 3-4 × 10²² n/cm².

Original language	English
Pages (from-to)	197-205
Number of pages	9
Journal	Journal of Nuclear Materials
Volume	473
DOIs	https://doi.org/10.1016/j.jnucmat.2016.01.036
State	Published - May 1 2016
Externally published	Yes

Funding

The authors gratefully acknowledge the financial support from the Nuclear Energy University Program (NEUP) of Department of Energy (DoE) for performing this research.

Keywords

Activation energy
Creep
Graphite
Irradiation

Access to Document

10.1016/j.jnucmat.2016.01.036

Cite this

@article{08de492f9cf842f7b61520be9291d94d,

title = "Modeling irradiation creep of graphite using rate theory",

abstract = "We have examined irradiation induced creep of graphite in the framework of transition state rate theory. Experimental data for two grades of nuclear graphite (H-337 and AGOT) have been analyzed to determine the stress exponent (n) and activation energy (Q) for plastic flow under irradiation. We show that the mean activation energy lies between 0.14 and 0.32 eV with a mean stress-exponent of 1.0 ± 0.2. A stress exponent of unity and the unusually low activation energies strongly indicate a diffusive defect transport mechanism for neutron doses in the range of 3-4 × 1022 n/cm2.",

keywords = "Activation energy, Creep, Graphite, Irradiation",

author = "Apu Sarkar and Jacob Eapen and Anant Raj and Murty, \{K. L.\} and Burchell, \{T. D.\}",

year = "2016",

month = may,

day = "1",

doi = "10.1016/j.jnucmat.2016.01.036",

language = "English",

volume = "473",

pages = "197--205",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

TY - JOUR

T1 - Modeling irradiation creep of graphite using rate theory

AU - Sarkar, Apu

AU - Eapen, Jacob

AU - Raj, Anant

AU - Murty, K. L.

AU - Burchell, T. D.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - We have examined irradiation induced creep of graphite in the framework of transition state rate theory. Experimental data for two grades of nuclear graphite (H-337 and AGOT) have been analyzed to determine the stress exponent (n) and activation energy (Q) for plastic flow under irradiation. We show that the mean activation energy lies between 0.14 and 0.32 eV with a mean stress-exponent of 1.0 ± 0.2. A stress exponent of unity and the unusually low activation energies strongly indicate a diffusive defect transport mechanism for neutron doses in the range of 3-4 × 1022 n/cm2.

AB - We have examined irradiation induced creep of graphite in the framework of transition state rate theory. Experimental data for two grades of nuclear graphite (H-337 and AGOT) have been analyzed to determine the stress exponent (n) and activation energy (Q) for plastic flow under irradiation. We show that the mean activation energy lies between 0.14 and 0.32 eV with a mean stress-exponent of 1.0 ± 0.2. A stress exponent of unity and the unusually low activation energies strongly indicate a diffusive defect transport mechanism for neutron doses in the range of 3-4 × 1022 n/cm2.

KW - Activation energy

KW - Creep

KW - Graphite

KW - Irradiation

UR - https://www.scopus.com/pages/publications/84960155536

U2 - 10.1016/j.jnucmat.2016.01.036

DO - 10.1016/j.jnucmat.2016.01.036

M3 - Article

AN - SCOPUS:84960155536

SN - 0022-3115

VL - 473

SP - 197

EP - 205

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Modeling irradiation creep of graphite using rate theory

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this