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Hydrogen absorption in Mg-Gd alloy
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SYSNO ASEP 0508749 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Hydrogen absorption in Mg-Gd alloy Author(s) Vlček, M. (CZ)
Čízek, J. (CZ)
Lukáč, František (UFP-V) ORCID
Hruška, P. (CZ)
Smola, B. (CZ)
Stulíková, I. (CZ)
Kudrnová, H. (CZ)
Minárik, P. (CZ)
Kmjec, T. (CZ)
Vlasák, T. (CZ)Number of authors 10 Source Title International Journal of Hydrogen Energy. - : Elsevier - ISSN 0360-3199
Roč. 42, č. 35 (2017), s. 22598-22604Number of pages 7 s. Language eng - English Country US - United States Keywords rare-earth ; magnesium alloys ; unexpected formation ; storage properties ; microstructure ; nd ; re ; hydrides ; pr ; er ; Hydrogen ; Magnesium alloys ; Rare earth elements Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Materials engineering R&D Projects GA16-12828S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000411168200043 EID SCOPUS 85018168899 DOI 10.1016/j.ijhydene.2017.04.012 Annotation Mg-Gd alloy containing 22 wt.% Gd was studied in the present work. As cast alloy contains Mg46Gd9 phase located at pockets along grain boundaries. In addition the as-cast alloy contains a low concentration of rectangular GdH2 particles. Solution treatment at 530 degrees C was performed in order to dissolve Gd in the Mg matrix. The solution treatment in air enhanced the volume fraction of GdH2 particles by one order of magnitude. The formation of GdH2 particles is caused by hydrogen-induced decomposition of the Mg46Gd9 intermetallic phase. The source of hydrogen is water vapor reacting with Mg surface. A Gd-rich oxide layer was formed during solution treatment in air. Building of the oxide layer requires diffusion of Gd solutes from bulk to the surface and leads to formation of a Gddepleted sub-surface region. It was found that solution treatment in vacuum results in substantially lower volume fraction of GdH2 particles. Alternative methods of formation of GdH2 particles in Mg-Gd alloy were examined as well and are discussed in the paper. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://www.sciencedirect.com/science/article/abs/pii/S0360319917312922?via%3Dihub
Number of the records: 1