Young's modulus evaluation of high burnup structure in UO2 with nanometer resolution

JOURNAL OF NUCLEAR MATERIALS

卷:508

Article

Terrani, Kurt A.¹  Balooch, Mehdi^1,2  Burns, Joseph R.¹  Smith, Quinlan B.¹ 

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

关键词: Elastic modulus;    Hardness;    Nano-indentation;    High burnup fuel;   

DOI  :  10.1016/j.jnucmat.2018.04.004

来源: Elsevier

【 摘 要 】

The mechanical properties of a well-characterized irradiated light water reactor fuel pin with an average burnup of 72 MWd/kgU were investigated by utilizing nano-indentation technique. Young's modulus and hardness are reported as functions of radial positions covering from mid radial position in the urania pellet to high burnup structure, fuel-cladding chemical interaction zone and zirconium-based cladding. By probing microstructure of the high burnup zone, the mechanical properties of sub-grains and the interaction between them were examined at the nanometer scale. Force-displacement curves from each of these individual sub-grains suggest they resemble single crystal UO2. However, these restructured grains are weakly bonded to their neighbors. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free