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Descripción
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| The trapping and mobility of hydrogen in nanostructured tungsten grain boundaries (GBs) have been studied by combining experimental and density functional theory (DFT) data. Experimental results show that nanostructured W coatings with a columnar grain structure and a large number of (1 1 0)/(2 1 1) interfaces retain more H than coarsed grained W samples. To investigate the possible influence of GBs on H retention, a complete energetic analysis of a non-coherent W(1 1 0)/W(1 1 2) interface has been performed employing DFT. Our results show that this kind of non-coherent interface largely attracts point defects (both a H atom and a metallic monovacancy separately) and that the presence of these interfaces contributes to a decrease in the migration energy of the H atoms with respect to the bulk value. When both the W monovacancy and H atom are introduced together into the system, the HV complex becomes the most stable configuration and one of the mechanisms explaining the H retention in the radiation damaged GB observed experimentally. | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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NUCLEAR FUSION |
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ISSN
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0029-5515 |
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Factor de impacto JCR
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3,243 |
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Información de impacto
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Volumen
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55 |
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DOI
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10.1088/0029-5515/55/11/113009 |
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Número de revista
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Desde la página
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113009 1 |
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Hasta la página
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113009 9 |
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Mes
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SIN MES |
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