The scientific principles of alloying high-temperature Niobium alloys providing high strength and workability of alloys via strengthening by dispersion particles of thermodynamically stable oxides, nitrides, carbides, as well as alloys strengthening by intermetallic compound dispersion particles have been considered. The main attention has been paid to structure designing aspect. The last one is based on revealing of dependence between manufacturing and treatment conditions, structure and mechanical properties of the alloys. The principles' of alloying and structure designing provides the alloys in high-temperature strength and specific high-temperature strength are superior as compared with all' known Niobium-base alloys.
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