Production of a sintered alloy based on the TiAl intermetallic compound. Part 1: Calcium-hydride fabrication technology of the Ti–47Al–2Nb–2Cr powder alloy and its properties

Alloy powder of the Ti–47Al–2Nb–2Cr composition (at %) with a structure of TiAl (60 wt %) and Ti3Al (40 wt %) is prepared by the calcium-hydride method. The mode of calcium-hydride synthesis is optimized for the Ti–50Al (at %) model alloy. It is established that the reduction temperature should be no lower than 1100°C, while the excess of the CaH2 reducing agent should be no lower than 15 wt %. The main physicochemical and manufacturing properties of the synthesized Ti–47Al–2Nb–2Cr powder alloy, which provide the formation of dense compact items during its subsequent consolidation processes, are determined using modern analytical methods.