Structural and Hydrogen Storage Properties of Mg60-Ni40 and Mg80-Ni20 Alloys Prepared by Planar Flow Casting
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JMEPEG https://doi.org/10.1007/s11665-020-05069-1
Structural and Hydrogen Storage Properties of Mg60-Ni40 and Mg80-Ni20 Alloys Prepared by Planar Flow Casting _ ¸ in Sefa Emre Su¨nbu¨l, Sultan O¨ztu¨rk, and Ku¨rs¸ at Ic (Submitted June 25, 2020; in revised form July 22, 2020) This study was carried out to better understand the chemical composition, microstructure, and hydrogen properties of Mg binary alloys. In this study, Mg60-Ni40 and Mg80-Ni20 (wt.%) alloy ribbons with different microstructures have been produced by the melt spinning method. The structural, hydriding, and dehydriding properties of the alloys were evaluated. The phase constitutions and microstructures were characterized by XRD and SEM studies. Microstructural grain sizes measured for Mg60-Ni40 alloy ribbons were in the range of 1-5 lm, and the alloy contained finely dispersed Mg and Mg2Ni phases. In the case of Mg80-Ni20 alloy ribbons, the microstructural grain sizes were measured as less than 1 lm. The hydrogen absorption and desorption capacities and kinetics of these two alloys were found to be highly dependent on microstructure and phase properties. Also, the amount of Ni content affected both the hydrogen storage capacities and kinetics for both of the Mg-Ni binary alloys. The increasing amount of Ni resulted in reduced hydrogen absorption capacity. The Mg60-Ni40 and Mg80-Ni20 alloy ribbons demonstrated superior hydrogenation absorption capacity at 350 °C and reversibly absorbed about 4.62 and 5.51 (wt.%) mass hydrogen, respectively. Keywords
hydrogen storage, magnesium alloys, melt-spinning, rapid-solidification
1. Introduction Hydrogen is storable energy for future utilization, particularly for mobile and automotive applications. It has great potential due to its clean, renewable, and storable properties (Ref 1, 2). In this context, the hydrogen storage subject has been recognized as the most critical aspect of hydrogen-based economies (Ref 3-5). Various storage methods have been developed for different applications from past to present. These methods involve the storage of hydrogen in the form of highly pressurized gas, a liquid form, and metal hydride (Ref 6, 7). Among them, the metal hydride-type storage technique can be achieved under relatively low temperature and pressure, in comparison with liquid and gas storage methods (Ref 8). In addition, the metal hydride process is a more efficient, inexpensive, and safe method. (Ref 9-13). Among the various metal hydrides, Mg and Mg-based alloys are noticeably attractive owing to superior hydrogen absorption capacities and relatively low production costs (Ref 14-17). The pure magnesium has the properties of lightweight, low price, excellent hydrogen storage capacity, and sufficient availability on earth (Ref 13). On the other hand, the poor hydriding/ Sefa Emre Su¨nbu¨l, Department of Metallurgical and Materials Engineering, Karadeniz Technical University, Kanuni Campus, 61040 Trabzon, Turkey; and Department of Metallurgical and Materials Engineering, Gaziantep University, 27310 Gaziantep, _ ¸
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