Abstract
The hydriding rates during initial and subsequent hydriding processes, the pressure-composition isotherms and microstructures of FeTi alloys, to which Fe 2O 3 with copper or niobium was added for titanium, were investigated. The simultaneous introduction of Fe 2O 3 together with copper or niobium for titanium in FeTi yielded FeTi activation at room temperature without any heat treatment and shortened the incubation time for the initial hydriding more effectively than did the single introduction of copper or niobium for titanium in FeTi. The alloys, to which Fe 2O 3 with copper or niobium was added, were composed of an FeTi matrix and precipitates of Fe 2Ti and the oxide (Fe 7Ti 10O 3) phases. The results suggested that interfaces between the FeTi matrix and precipitates act as active sites for the hydriding reaction and/or as entrance sites for hydrogen to diffuse into the alloy. The compositions of the FeTi matrix phase in the FeTi alloys with Fe 2O 3 and copper and with Fe 2O 3 and niobium were approximately Fe 1− x -TiCu x and FeTi 1− x Nb x respectively. There were apparent differences between the pressure-composition isotherms for the Fe 2O 3 and copper introduced alloys and the Fe 2O 3 and niobium introduced alloys. These differences may result because the addition element substitutes for either the titanium or the iron site in the FeTi phase.
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