Significant growth of vacancy-type defects by post-irradiation annealing in neon ion-irradiated tungsten probed by a slow positron beam

JOURNAL OF NUCLEAR MATERIALS

卷:531

Article

Yabuuchi, A.¹  Tanaka, M.¹  Kinomura, A.¹ 

[1] Kyoto Univ, Inst Integrated Radiat & Nucl Sci, Kumatori, Osaka 5900494, Japan

关键词: Tungsten;    Noble gas;    Ion irradiation;    Vacancy;    Positron annihilation spectroscopy;    Slow positron beam;   

DOI  :  10.1016/j.jnucmat.2020.152018

来源: Elsevier

【 摘 要 】

Irradiation damage and its evolution in noble gas ion-irradiated tungsten have not been investigated in detail other than in the case of helium ion irradiation. In this study, irradiation-induced vacancy-type defects in helium ion- and neon ion-irradiated tungsten were investigated by using a slow positron beam, and their annealing behavior in the temperature range of 20 degrees C-900 degrees C was compared by characterizing the Doppler broadening of positron annihilation radiation spectra. In helium ion-irradiated tungsten, slight aggregation of irradiation-induced vacancy-type defects was observed upon annealing, but eventually, a large portion of the vacancy clusters was eliminated after annealing at 900 degrees C. In contrast, in neon ion-irradiated tungsten, irradiation-induced vacancy-type defects were observed to aggregate significantly at 300 degrees C and 600 degrees C. In addition, the large vacancy clusters formed by the aggregation survived even after annealing at 900 degrees C. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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