Effect of yttrium addition on microstructure and orientation of hydride precipitation in Zr-1Nb alloy |
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| Affiliation: | 1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China;2. Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom;1. Advanced Energy Materials Processing Laboratory, Center for Energy Convergence Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea;2. Department of Material Science & Engineering, Korea University, Seoul 136-713, Republic of Korea;1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes (Tianjin Polytechnic University), Tianjin 300387, PR China;2. Institute of Medical Equipment, Academy of Military and Medical Sciences, Tianjin 300161, PR China;1. Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich, Lichtenbergstr. 1, 85747 Garching, Germany;2. Institute of Energy and Climate Research (IEK-3), Forschungszentrum Jülich, D-52425 Jülich, Germany;3. RWTH Aachen University, Faculty of Mechanical Engineering, D-52062 Aachen, Germany;4. Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany |
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| Abstract: | The purpose is to investigate the role of yttrium addition in improving hydride embrittlement resistance in Zr-1Nb alloy, because yttrium addition has been widely used to improve oxidation resistance of alloys. The results suggest that 0.2 wt.% yttrium addition can effectively lower hydrogen absorption in Zr-1Nb alloy. The microstructural characterization shows that the precipitated hydrides are interlinked to have a width of 200–600 nm and a shape of lamellar or “dendritic”. The electron backscattered diffraction (EBSD) results show that the crystallographic orientation relationship between precipitated hydrides and zirconium matrix is (0001)α-Zr//{111}δ-H0.62Zr0.38 or (0001)α-Zr//{100}δ-H0.62Zr0.38, depending on the position and morphology of hydrides. The depression of hydrogen absorption is attributed to the reduction of transgranular hydride precipitation by yttrium addition. This study provides an experimental basis for designing new zirconium alloys with enhanced hydrogen absorption resistance. |
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| Keywords: | Zr-1Nb Hydrogen absorption Crystallographic orientation relationship Yttrium addition |
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