Change in nanoindentation hardness of polycrystalline tungsten irradiated with Fe ions or electrons by hydrogen gas charging

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原文链接

NSTL

外文摘要：© 2021 Elsevier B.V.The effects of hydrogen atoms on the hardnesses of unirradiated, ion-irradiated, and electron-irradiated polycrystalline tungsten samples were investigated using nanoindentation tests. The bulk equivalent hardnesses of the unirradiated and electron-irradiated tungsten samples did not change upon hydrogen charging. The bulk equivalent hardness of the ion-irradiated tungsten increased upon the hydrogen charging. The number of hydrogen atoms trapped at dislocation loops was very small. We estimated that the hydrogen occupancy in vacancy clusters was 0.24−0.45 (in the case of tri-vacancies, the number of hydrogen atoms trapped per vacancy (H/V) is 1.04−1.95). Because of the irradiation temperature of 573 K, the density and size of irradiation-induced defects did not change during hydrogen charging at 543 K. Therefore, the hardening was mainly caused by an increase of approximately 8 − 11% in the obstacle strength α of vacancy clusters containing hydrogen atoms. The ion-irradiated area hardened upon the hydrogen charging and changed the configuration of the pile-up. Observation of the dislocation structure is required to clarify the mechanism of hardening caused by hydrogen charging.

外文关键词：

Electron irradiationHardnessHydrogenIon irradiationNanoindentationTungsten

作者：

Sato K.、Kiyohara A.、Hirabaru M.、Kasada R.、Nakano K.、Yabuuchi K.、Hatakeyama M.、Xu Q.

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作者单位：

Graduate School of Science and Engineering Kagoshima University

Institute for Materials Research Tohoku University

Graduate School of Science and Engineering for Education University of Toyama

Institute of Advanced Energy Kyoto University

Graduate School of Science and Engineering for Research University of Toyama

Institute for Integrated Radiation and Nuclear Science Kyoto University

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出版年：

2022

DOI：

10.1016/j.jnucmat.2021.153483

Journal of Nuclear Materials

EISCI

ISSN：0022-3115

年,卷(期)：2022.560

参考文献量32