A study on the dehydriding kinetics in the Mg2Ni-Ni (< 5 wt.%)-H2 system |
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| Institution: | 1. The Graduate School of Natural and Applied Sciences, Dokuz Eylul University, Izmir, Turkey;2. Department of Mechanical Engineering, Faculty of Engineering, Dokuz Eylul University, Izmir, Turkey;1. National Engineering Research Center of Light Alloys Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Shanghai Engineering Research Center of Mg Materials and Applications & School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;1. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;2. Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima 30000, Thailand |
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| Abstract: | The dehydriding kinetics of the Mg2Ni-Ni (< 5 wt.%)-H2 system is studied at temperatures between 553 and 593 K under hydrogen pressures from 0.8 to 3.2 bar. In the temperature range from 553 to 563 K the nucleation of α-solid solution of hydrogen in Mg2Ni is found to be the rate-controlling step for the dehydriding reaction. In the temperature range from 573 to 593 K the rate-controlling steps are Knudsen flow and ordinary gaseous diffusion of hydrogen molecules through pores, interparticle channels and cracks. |
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