|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Effect of Microstructural Refinement and Na Addition on Hydrogenation Kinetics of Cast Mg-Al-La Alloy during the First Hydrogen Absorption Process
||Manjin Kim, Stuart McDonald, Yahia Ali, Trevor Abbott, Kazuhiro Nogita
|On-Site Speaker (Planned)
Long activation cycles, slow sorption kinetics, and high desorption temperature have been obstacles that hinder commercialisation of Mg-based alloys for hydrogen storage systems. Previously, it has been demonstrated that fine eutectic microstructure and trace Na additions to binary Mg-based alloys such as Mg-Ni and Mg-La improve hydrogen absorption kinetics during the first absorption cycle. However, no study about the effect of eutectic microstructure and Na additions on hydrogen absorption kinetics of ternary Mg-based alloys has been reported. In this work, we have extended this technique to an Mg-Al-La ternary alloy. The result shows that Na addition causes coarser eutectic structure in the alloy however improves hydrogen absorption kinetics. The mechanisms of absorption kinetics improvement via Na addition are discussed in terms of microstructure change and chemical effect of Na during hydrogen absorption process.
||Magnesium, Energy Conversion and Storage, Solidification