Hydrogen absorption and desorption characteristics of mechanically milled Mg35wt.%FeTi 1.2 powders

Abstract

Mg35wt.%FeTi 1.2 hydrogen storage materials were made by mechanical milling of mixed elemental magnesium and FeTi 1.2 alloy powders. The hydrogen absorption and desorption characteristics of powders milled for various times were evaluated. The results show that the P C T characteristics, hysteresis, plateau pressure, storage capacity, and hydriding and dehydriding rates change substantially with increasing milling time. Mechanical milling produces fine powder with nanometer-sized grains and large microstrain, which results in an increase in the hydriding and dehydriding rates.