Features of the HDDR process in ZrT2 (T = Cr, Mn, Fe, Co) compounds

The conditions for the realization of the hydrogenation–disproportionation–desorption–recombination (HDDR) process in intermetallic compounds (IMC) ZrT2 (T=Cr, Mn, Fe, Co) have been determined by means of differential thermal analysis (DTA) and X-ray phase analysis (XPhA). It was determined that after HD, the C14 type Laves phase ZrCr2 decomposes into a zirconium hydride and chromium. After maintaining the highest heating recombination temperature for 3h, the disproportionation products are completely converted into a C15 type Laves phase. In the case of the ZrMn2 compound, a hydride of the initial phase was found. For the ZrFe2 and ZrCo2 compounds no changes were found after the treatment, but homogenization of the initial phase was observed.