High temperature mechanical properties of fluorite crystal structured materials (CeO2, ThO2, and UO2) and advanced accident tolerant fuels (U3Si2, UN, and UB2)

JOURNAL OF NUCLEAR MATERIALS

卷:554

Article

Frazer, D.^1,2  Maiorov, B.¹  Carvajal-Nunez, U.¹  Evans, J.^3,4  Kardoulaki, E.¹  Dunwoody, J.¹  Saleh, T. A.¹  White, J. T.¹ 

[1] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87544 USA

[2] Idaho Natl Lab, Adv Characterizat & PIE, Idaho Falls, ID 83415 USA

[3] Los Alamos Natl Lab, MPA, Los Alamos, NM USA

[4] Idaho Natl Lab, Dept Irradiated Fuels & Mat, Idaho Falls, ID USA

关键词: High temperature nanoindentation;    Resonant ultrasound spectroscopy;    Accident tolerant fuels;    Mechanical properties;    Elastic constants;   

DOI  :  10.1016/j.jnucmat.2021.153035

来源: Elsevier

【 摘 要 】

The mechanical interaction between the fuel and cladding that occurs during operation of a nuclear reactor is important to understand as it can lead to cladding failures and release of radioactive material into the coolant. In order to develop better models of the pellet-clad mechanical interactions, the mechanical properties of the fuel at relevant operating temperatures, like the elastic moduli, are needed for current and advanced accident tolerant fuels (ATFs). In this work, elevated temperature nanoindentation and resonant ultrasound spectroscopy were used to measure the moduli and hardness of several fluorite materials (CeO2, ThO2, UO2) and several ATF candidates (ATF) (U-3 Si-2, UN, UB2). In addition, a comparison of the two techniques was performed in this study to independently validate the mechanical properties. (C) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

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