Abstract
The B2 crystal structure intermetallic NiAl is of interest for use as an elevated temperature structural material because of its relatively low density ({approximately} 6 Mg/m{sup 3}), high melting point ({approximately} 1900 K), and potential for self protection in oxidizing/corrosive atmospheres. However a major drawback is the lack of elevated temperature strength. Alloying is a commonly used metallurgical technique to introduce strength through solid solution and/or precipitation hardening mechanisms, and several studies of third element additions have been described. This paper describes the effect of a large Nb addition ({approximately} 20 wt pct) to nickel aluminide on the 1200 and 1300 K compressive strength and presents a comparison of data from all known, strong solid solution and/or precipitation strengthened NiAl-based materials.
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