Abstract
The review collates the results of studies on the chemical dispersion and phase transformations of Ti, Zr, and Y alloys with iron and nickel during the reaction with ammonia at a pressure of 0.6—0.8 MPa in the temperature range of 100—500 °C in the presence of NH4Cl as the activator. Promising working materials for metal hydride hydrogen storage, including alloys (Ti90Mg10, Y67Fe33, and Ti67Fe33) and intermetallics (Ti2Ni, Zr2Ni, Zr3Al2, ZrV2), are considered. At 150—250 °C, the mentioned intermetallics absorb considerable amounts of hydrogen with conservation of the initial metallic lattice and formation of the highly dispersed hydrides Ti2NiH3.3, Zr2NiH4.7, Zr3Al2H1.1, and ZrV2H2.2. The phase transformations taking place on heating of the intermetallics from 250 to 500 °C, resulting in mixtures of intermetallic hydridonitrides and metal nitrides, are elucidated. The transformation products of the Ti90Mg10, Y67Fe33, and Ti67Fe33 alloys in ammonia atmosphere in the temperature range of 100—500 °C are established.
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Tarasov, B.P., Fokina, E.E. & Fokin, V.N. Dispersion and phase transformations of intermetallic compounds and alloys of Ti, Zr, and Y with iron and nickel in the reaction with ammonia. Russ Chem Bull 65, 1887–1892 (2016). https://doi.org/10.1007/s11172-016-1529-2
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DOI: https://doi.org/10.1007/s11172-016-1529-2