Hydrogen absorption in CuTi metallic glasses. I. X-ray diffraction measurements

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Abstract
The effect of hydrogen absorption on the atomic structures of some CuTi glasses has been investigated by X-ray diffraction. The dependence on composition has been studied using three alloy compositions, Cu0.50Ti0.50, Cu0.58Ti0.42 and Cu0.66Ti0.34, and the influence of loading increasing amounts of hydrogen investigated for the latter two compositions. It is confirmed that these glasses can accept significant quantities of hydrogen to form amorphous hydrides and that the process is limited by a dissociation reaction involving the formation of titanium hydride TiH2 and free copper. Quite characteristic changes in the structure factor are produced by hydrogen loading and these are reflected in definite changes in the radial distribution function, similar to those observed elsewhere for other metallic glass-hydrogen systems. The results obtained in this study are in broad agreement with the conclusions of independent bulk measurements on CuTi-H glasses.