Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing

In the current study, Twin Parallel Channel Angular Extrusion (TPCAE) as a developed SPD processing technique is used to improve hydrogen storage properties of AZ91 cast alloy. The conducted at different temperatures, ranging from 340 °C down 200 °C. absorption and desorption tests are kinetically three using Sievert-type apparatus. Remarkable improvement in kinetic achieved result TPCAE processing. A maximum capacity 6.1 wt.% within time span 2000 s for sample with passes complemented 250 Also, dehydrogenation improved significantly complete 350 all processed samples 2500 s. By calculating activation energy hydrogenation evaluating microstructure changes, it found that implementing sufficient thermomechanical work level along applying last pass process lower temperature results reduction kinetic.