Effects of adding nano-CeO2 powder on microstructure and hydrogen storage performances of mechanical alloyed Mg90Al10 alloy |
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| Affiliation: | 1. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;2. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;3. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Institute of Computing Science and Technology, Guangzhou University, Guangzhou, 510006, China;2. Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, 24060, USA;3. Department of Mechanical Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran;4. Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, OH, USA;1. Hydrogen for Mobility Lab, Materials and Processes for Energy Needs Research Group, Institute for Future Transport and Cities, Coventry University, Priory Street, Coventry, CV1 5FB, United Kingdom;2. National Institute of Research and Development for Technical Physics, Iasi, Romania;3. Institute for Advanced Materials, Physicochemical Processes, Nanotechnology & Microsystems, National Centre for Scientific Research ''Demokritos'', Agia Paraskevi, Athens, 15310, Greece;4. Department of Environmental Engineering, University of Patras, 2 Seferi St. Agrinio, Greece;1. College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, PR China;2. Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China;1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;3. Department of Mechanical Engineering, Hebei University, Baoding 071002, China;1. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan;2. Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
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| Abstract: | For pushing Mg-based alloys developing to the practical applications, nano-CeO2 powders were added into the mechanical alloyed (MA) Mg90Al10 alloy. The aim of it is to improve the thermodynamics and kinetics through generating new intermetallic compound, reducing the grain size and increasing the solid solubility of Al in Mg. XRD analysis showed that adding nano-CeO2 powder causes the generation of Mg17Al12 phase and grain refinement of the MA Mg90Al10 + x wt% CeO2 (x = 1, 3, 5 and 8) composites. It also increases the solid solubility of Al in Mg, while results in the reduction of Mg lattice volume. The dehydrogenation enthalpy (ΔHde), calculated from Van't Hoff equation, is reduced from 75.43 kJ mol?1 H2 for the MA Mg90Al10 alloy to 74.22, 72.70, 70.28 and 73.71 kJ mol?1 H2 for the MA Mg90Al10 + x wt% CeO2 (x = 1, 3, 5 and 8) composites, respectively. The increased grain boundaries, caused by the grain refinement and formation of the mutilphase structure, are beneficial to reduce the dehydrogenation activation energy (Ede(a)). It is obtained through Johnson-Mehl-Avrami-Kolmogorov model, which is 162.06, 121.86, 103.73, 101.83 and 109.08 kJ mol?1 H2 for the MA Mg90Al10 + x wt% CeO2 (x = 0, 1, 3, 5 and 8) composites, respectively. |
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| Keywords: | Mechanical alloying Kinetics Thermodynamics |
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