Abstract
The addition of trace concentrations of elements such as Na and Sr along with rapid cooling is well-established method for modification of the faceted eutectic Si in Al–Si. There have been some efforts to extend this strategy to Mg-based alloys. For example, it has been reported that trace Na addition to Mg–Ni alloys can also refine the eutectic Mg2Ni phase and facilitate functional property improvements such as hydrogen absorption kinetics. In this work, we have extended this strategy to a variety of other Mg-based alloys such as Mg–Ni and Mg–La alloys through the addition of trace elements and use of different cooling rates. The modification of the eutectic morphology in these alloys is discussed with regard to the Jackson parameters which were calculated using data from Thermo-Calc. The relationship between eutectic modification and hydrogen absorption kinetics in these alloys is investigated. The work has demonstrated, contrary to prior expectations, that microstructural refinement and hydrogen absorption kinetics are not necessarily correlated.
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Acknowledgements
This work supported by funding from the Australian Research Council Linkage Project LP160100690 and Australian Government Research Training Program (RTP) Scholarship that have contributed to this research. The authors acknowledge Dr. Christopher Gourlay (Faculty of Engineering, Department of Materials, Imperial College London) for calculation of Jackson Parameter and the facilities, and the scientific and technical assistance, of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis.
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Kim, M., Ali, Y., McDonald, S.D., Abbott, T.B., Nogita, K. (2020). The Independent Effects of Cooling Rate and Na Addition on Hydrogen Storage Properties in Hypo-eutectic Mg Alloys. In: Jordon, J., Miller, V., Joshi, V., Neelameggham, N. (eds) Magnesium Technology 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36647-6_43
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