A Ti3Al-based titanium aluminide alloy, Ti-24Al-11Nb, was cathodically charged with hydrogen in a 5% H2SO4 aqueous solution for various charging times, and the formation and dissociation of the hydride, the hydrogen evolution behavior and the total hydrogen uptake were investigated mainly by means of X-ray diffractometry and thermal desorption spectroscopy (TDS). The same kind of hydride phase as observed previously in Ti-25Al alloy (hexagonal hydride) was presumably formed in the Ti-24Al-11Nb alloy after cathodic charging. No damage, such as cracks, was induced by hydrogen charging. Two kinds of TDS peaks, one probably corresponding to hydride dissociation and the other to hydrogen dissolution in the normal lattice site, were found after longer hydrogen charging. It is suggested that niobium addition to Ti3Al-based titanium aluminide alloy may reduce hydrogen susceptibility during cathodic charging.
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