journal article·2019-10-01Open access

Microscopic 3-dimensional mapping of hydrogen bubbles in polycrystalline Al by elastic recoil detection analysis under transmission geometry

A. Yamazaki, K. Sasa, S. Tomita, S. Ishii, H. Naramoto, M. Sataka, H. Kudo, G. Itoh, M. Ohkubo

AIP Advances· Volume 9· Issue 10

Abstract

We have measured microscopic 3-dimensional distribution of plasma-charged hydrogen in polycrystalline Al. The measurements have been carried out nondestructively by using elastic recoil detection analysis under transmission geometry of a collimated 8 MeV 4He2+ beam. The recoil cross section as large as 2 × 103 mb/sr due to the nuclear elastic collision allowed observation of the spatial distribution of hydrogen in the Al sample of 80 μm thickness. The distribution maps of hydrogen clearly visualize hydrogen bubbles of 10–20 μm diameter in the surface layer of about 12 μm thickness. The critical concentration of hydrogen minimally needed for growth of the hydrogen bubble of ten-μm size has been determined to be 1.6 × 1020 cm−3.
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Research context

OpenAlex topics: Nuclear Materials and Properties · Hydrogen embrittlement and corrosion behaviors in metals · Ion-surface interactions and analysis

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Affiliations

Faculty of Pure and Applied Sciences, University of Tsukuba 1 , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan

Research Facility Center for Science and Technology, University of Tsukuba 2 , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan

Department of Mechanical Engineering, College of Engineering, Ibaraki University 3 , 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan

National Institute of Advanced Industrial Science and Technology (AIST) 4 , 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

Funding

Cross-Ministerial Strategic Innovation Promotion Program–Unit D66–Innovative Measurement and Analysis for Structural Materials

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