Deformation behaviour of intermetallic NiAlTa alloys with strengthening Laves phase for high-temperature applications. II. Effects of alloying with Nb and other elements

Abstract

Ta-containing NiAl-base alloys with the Laves phase TaNiAl with C14 structure, which were studied in Part I of this study, were modified by further alloying and were studied with respect to constitution and deformation behaviour at ambient and high temperatures—including elastic deformation and creep—as a function of alloy composition and microstructure. Advantageous effects on the mechanical behaviour with reduction of brittle-to-ductile transition temperature and flow stress were found only for alloying additions of Nb, which can replace Ta completely and which was studied extensively, as well as Fe, Cr and Si. The NiAlTaCr case was selected as most promising for further alloy development and is subject of the subsequent Part III.