Abstract
The Ru-Ni-Al system is significant for a number of reasons, not least of which is the interest in the ruthenium and nickel aluminides for high-temperature structural applications. The widely disparate properties of the B2 structured compounds NiAl and RuAl, in particular, have enjoyed extensive study. Whereas various factors, including a limited number of slip systems, conspire to render NiAl brittle at room temperature. Fleischer et al. have drawn attention to the unusual room-temperature ductility and toughness that RuAl exhibits in combination with high-temperature strength, specific stiffness, and oxidation resistance. Since alloys based on platinum group metals (PGMs) have apparent cost implications, some effort has been expended in seeking ways to replace some of the Ru without adversely affecting the intrinsic ductility. One approach is to seek some convergence in the properties of RuAl and its less ductile B2 counterparts by isostructural substitution for the Ru. In this regard, the existence of a B2 NiAl phase makes Ni an obvious candidate.
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