Abstract
The initial stage of hydrogen absorption was investigated on Mg–Ni based alloys, such as Mg 2Ni and Mg 3Ni (the eutectic mixture of Mg 2Ni and Mg), using neutron radiography (NRG). The NRG images were obtained by not only a simple transmission method but also a tomographic one, which could clearly visualize hydrogen distribution in the alloys. The hydrogen diffusion coefficient in these alloys was estimated to be ≈2×10 −7 cm 2 s −1 from the change in hydrogen absorption depth with hydrogenation time. The comparison of the volume expansion rate due to hydrogen absorption for the alloys showed that Mg 3Ni has better toughness than Mg 2Ni until Mg 3Ni was partly degraded to form magnesium hydride. Thus, NRG was found to be a powerful tool to clarify the behavior of hydrogen in hydrogen storage alloys.
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