Method for preparing a pulverulent material suitable for storing hydrogen, comprising the steps of: preparing a composite metallic material, by co-melting then cooling the following metallic mixtures: • a first metallic mixture, which is: an alloy, having a body-centred cubic crystal structure, with a titanium, vanadium and other metal M base, said other metal being chosen from the group consisting of chromium, manganese and mixtures thereof; and • a second mixture, which is: - an alloy, comprising: 38 to 42 mol% of a first metal M 1 selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and mixtures thereof; and 56 to 60 mol% of a second metal M 2, selected from the group consisting of nickel, copper, and mixtures thereof; with a weight ratio /(m1+m2) from 0.1 to 20 wt% in the co-melting step; said composite material obtained at the end of the co-melting step having: - a majority phase having a titanium, vanadium and chromium and/or manganese base, dispersed in the form of grains, this phase having a body-centred cubic crystal structure; and - at least one intergranular phase having as a base a first metal selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, or a mixture thereof; and a second metal selected from the group consisting of nickel, copper, or a mixture thereof, and hydrogenating the composite metallic material obtained, allowing the conversion of at least one part of the metals present into metal hydrides, and resulting in fragmentation of the material to powder form. preparing a composite metallic material, by co-melting then cooling the following metallic mixtures: • a first metallic mixture, which is: an alloy, having a body-centred cubic crystal structure, with a titanium, vanadium and other metal M base, said other metal being chosen from the group consisting of chromium, manganese and mixtures thereof; and • a second mixture, which is: - an alloy, comprising: 38 to 42 mol% of a first metal M 1 selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and mixtures thereof; and 56 to 60 mol% of a second metal M 2, selected from the group consisting of nickel, copper, and mixtures thereof; with a weight ratio /(m1+m2) from 0.1 to 20 wt% in the co-melting step; said composite material obtained at the end of the co-melting step having: - a majority phase having a titanium, vanadium and chromium and/or manganese base, dispersed in the form of grains, this phase having a body-centred cubic crystal structure; and - at least one intergranular phase having as a base a first metal selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, or a mixture thereof; and a second metal selected from the group consisting of nickel, copper, or a mixture thereof, and • a first metallic mixture, which is: an alloy, having a body-centred cubic crystal structure, with a titanium, vanadium and other metal M base, said other metal being chosen from the group consisting of chromium, manganese and mixtures thereof; and • a second mixture, which is: - an alloy, comprising: 38 to 42 mol% of a first metal M 1 selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and mixtures thereof; and 56 to 60 mol% of a second metal M 2, selected from the group consisting of nickel, copper, and mixtures thereof; with a weight ratio /(m1+m2) from 0.1 to 20 wt% in the co-melting step; said composite material obtained at the end of the co-melting step having: - a majority phase having a titanium, vanadium and chromium and/or manganese base, dispersed in the form of grains, this phase having a body-centred cubic crystal structure; and - at least one intergranular phase having as a base a first metal selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, or a mixture thereof; and a second metal selected from the group consisting of nickel, copper, or a mixture thereof, and - an alloy, comprising: 38 to 42 mol% of a first metal M 1 selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and mixtures thereof; and 56 to 60 mol% of a second metal M 2, selected from the group consisting of nickel, copper, and mixtures thereof; with a weight ratio /(m1+m2) from 0.1 to 20 wt% in the co-melting step; said composite material obtained at the end of the co-melting step having: 38 to 42 mol% of a first metal M 1 selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and mixtures thereof; and 56 to 60 mol% of a second metal M 2, selected from the group consisting of nickel, copper, and mixtures thereof; with a weight ratio /(m1+m2) from 0.1 to 20 wt% in the co-melting step; said composite material obtained at the end of the co-melting step having: - a majority phase having a titanium, vanadium and chromium and/or manganese base, dispersed in the form of grains, this phase having a body-centred cubic crystal structure; and - at least one intergranular phase having as a base a first metal selected from the group consisting of zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, or a mixture thereof; and a second metal selected from the group consisting of nickel, copper, or a mixture thereof, and hydrogenating the composite metallic material obtained, allowing the conversion of at least one part of the metals present into metal hydrides, and resulting in fragmentation of the material to powder form.