The hydriding property of DyFe2 alloy was examined with respect to the pressure-composition-temperature (P-C-T) relation and the pulverization behavior. The isotherm measured at 300 K suggests the formations of DyFe2H3 and/or DyFe2H4. The dissociation pressures of this hydride lie at 0.03 kg/cm2 at 300 K. Block samples of DyFe2 were found to be pulverized even after one hydriding-dehydriding reaction. The particle size of the DyFe2 powder can be controlled by changing the number of the cyclic hydriding-dehydriding reaciton.
