期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 47, 页码 16971-16976出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.05.149
关键词
Hydrogen storage; Magnesium alloys; Severe plastic deformation
资金
- FAPESP [05/59594-0]
- CNPq [472074/2013-0]
- CNPq Scholarships [143436/2009-0, 201443/2011-2]
- European Research Council under ERC [267464-SPDMETALS]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [05/59594-0] Funding Source: FAPESP
The hydrogen storage properties of a commercial ZK60 magnesium alloy were investigated after processing by equal-channel angular pressing (ECAP) and accumulative roll-bonding (ARB). Samples were prepared by 6 passes of ECAP and subsequently rolled 25 times. Microstructural characterization was performed using scanning and transmission electron microscopy. The kinetics of hydrogen absorption and desorption were measured in a Sievert-type apparatus. Processing only by ECAP resulted in a very low hydrogen storage capacity of 0.5 wt. %. Additional processing by ARB refined the microstructure and improved the hydrogen absorption. Despite this improvement, the hydrogen capacity was limited to less than 4 wt. %. This limitation was overcome by crushing the materials into small thin plates. The crushed sample from the ECAP material absorbed 4.77 wt. % of hydrogen in 24 h while the capacity of the sample processed by ECAP and ARB was 6.4 wt. %. The results are discussed in terms of morphology and microstructure of the samples. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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