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.
Highlights
Hydrogen can seriously affect physical, and especially, mechanical properties of materials, as reviewed in the literatures.1,2 Knowledge of hydrogen behavior in materials, for example, related to hydrogen embrittlement, is extremely required for structural materials used under severe environments
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
Elemental analyses based on atomic transitions are widely used, but these are not effective for direct detection of hydrogen in a surrounding medium of much heavier elements
Summary
Hydrogen can seriously affect physical, and especially, mechanical properties of materials, as reviewed in the literatures. Knowledge of hydrogen behavior in materials, for example, related to hydrogen embrittlement, is extremely required for structural materials used under severe environments. Hydrogen can seriously affect physical, and especially, mechanical properties of materials, as reviewed in the literatures.. Knowledge of hydrogen behavior in materials, for example, related to hydrogen embrittlement, is extremely required for structural materials used under severe environments. The hydrogen-induced phenomena accompany migration and accumulation of hydrogen in materials. Such behavior of hydrogen is not fully understood yet mainly because of the difficulty in sensitive detection of hydrogen.. Elemental analyses based on atomic transitions are widely used, but these are not effective for direct detection of hydrogen in a surrounding medium of much heavier elements. Direct detection of hydrogen, and microscopic visualization of 3-dimensional hydrogen distribution in solids is necessary for research and development of hydrogen-containing materials
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