Nano-crystallization induced by high-energy heavy ion irradiation in UO2

SCRIPTA MATERIALIA

卷:155

Article

Miao, Yinbin¹  Yao, Tiankai²  Lian, Jie²  Zhu, Shaofei¹  Bhattacharya, Sumit¹  Oaks, Aaron¹  Yacout, Abdellatif M.¹  Mo, Kun¹ 

[1] Argonne Natl Lab, 9700 S Cass Ave, Lemont, IL 60439 USA

[2] Rensselaer Polytech Inst, Troy, NY 12180 USA

关键词: Scanning/transmission electron microscopy (STEM);    Orientation imaging microscopy (OIM);    Nanocrystalline microstructure;    Misorientation;    High-burnup structure (HBS);   

DOI  :  10.1016/j.scriptamat.2018.04.006

来源: Elsevier

【 摘 要 】

Advanced microstructure investigations of the high-burnup structure (HBS) in UO2 produced by high-dose 84 MeV Xe ion irradiation are reported. Spark plasma sintered micro-grained UO2 was irradiated to 1357 dpa at 350 degrees C. The characteristic nano-grains and micro-pores of the HBS were formed. The grain size and grain boundary misorientation distributions of the HBS were measured using transmission electron microscopy based orientation imaging microscopy. Grain polygonization due to accumulation of radiation-induced dislocations was found to be the mechanism of nano-crystallization. The morphology of Xe bubbles was quantitatively investigated. This study provides crucial references for advanced fuel performance modeling of high-burnup UO2. (C) 2018 Published by Elsevier Ltd.

【 授权许可】

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