Modeling irradiation creep of graphite using rate theory

JOURNAL OF NUCLEAR MATERIALS

卷:473

Article

Sarkar, Apu¹  Eapen, Jacob¹  Raj, Anant¹  Murty, K. L.¹  Burchell, T. D.² 

[1] N Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27695 USA

[2] Oak Ridge Natl Lab, Fus Mat & Nucl Struct, Oak Ridge, TN 37831 USA

关键词: Graphite;    Creep;    Irradiation;    Activation energy;   

DOI  :  10.1016/j.jnucmat.2016.01.036

来源: Elsevier

【 摘 要 】

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 x 10(22) n/cm(2). (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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