Titanium aluminides are very important materials for elevated temperature applications, especially by its low density. The low density of these materials is also very attractive for other purpose, for example for using of these intermetallics as hydrogen accumulators or storages. It is well known that a number of metals can absorb large quantities of hydrogen. In many cases a major difficulty is getting the hydrogen into the metal. Oxide layer of titanium aluminides, which is so useful for its elevated temperature applications, prevents its hydrogen absorption. In such cases it is customary to expose the metal to hydrogen at high temperature and elevated temperature for an extended period of time, for titanium aluminides the adsorption temperature is about 800C. But such high temperature is not possible for the hydrogen accumulator. It has been discovered that ball milling of many metals under a hydrogen atmosphere promote rapid hydrogen absorption. We studied the hydrogen absorption properties of the Ti-Al-Nb system intermetallics during ball milling. We defined that the hydrogenation of the titanium aluminides under ball milling in the hydrogen atmosphere could occur at the room temperature without any requirements on quality of hydrogen. The crystal structure of the hydrides and phase transformations were also studied.
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