Hydrogen absorption and desorption performance of magnesium-aluminium alloys produced by powder metallurgy

The main scope of this study is investigating the hydrogen storage and desorption performance of mg: al (90:10),mg17al12 and mg2al3 alloys using a volumetric method. in the experiments,hydrogen pressure introduced into a reference volume was at approximately 20 bar. mg-al alloys were prepared by a powder metallurgy technique. pressing pressure levels of alloys were altered as 200,400 and 600 mpa. upon xrd patterns,after the pressing and sintering,ß- mg2al3 and mg:al(90:10) phases decomposed into ?-mg17al12,mg and al compositions. ?- mg17al12 was the main phase in the hydrogen absorption/desorption process. the highest absorption of hydrogen was observed in the mg:al (90:10) alloys. the hydrogen desorption performance of the alloys decreased with the increase of absorption performance. therefore the lowest desorption was observed in the mg:al (90:10) alloys.