Overview of NiAl Alloys for High Temperature Structural Applications

Abstract

ABSTRACT. NiAI alloys offer significant payoffs in gas turbine applications. Excellent progress has been made in understanding their mechanical behavior and improving low temperature ductility and high temperature strength. Significant improvements in mechanical properties have been obtained with microalloying. The next challenge is to develop an alloy which has the required balance of ductility, toughness, strength and other properties such as fatigue and impact resistance. Development of design, processing and test methodology for components made out of low ductility and anisotropic materials will also be required. While significant challenges remain, the prognosis for using NiAl alloys as high temperature structural materials is good.

Investigation of chromium effect on synthesis behavior of nickel aluminide during mechanical alloying process

“…Hence, numerous attempts have been made in recent years to overcome this problem. The common methods employed to improve the RT ductility of nickel aluminide intermetallics include: grain refining, improving the slip systems, and alloying [8][9][10][11][12][13][14][15]. Mechanical alloying (MA) can provide all those mentioned above simultaneously, therefore, this technique has been extensively applied to synthesize nickel aluminide intermetallic.…”

Effect of magnetic treatment on the microstructure of NiAl–Re alloy

“…The possibility to control the defect structure and, thus, diffusion processes in ordered intermetallic NiAl compounds is a serious aspect as they are used in conditions of high-temperature oxidation and a protective oxide layer needs to be formed on their surface. The development of alloys and heat-resistant coatings based on NiAl nickel aluminide is one of the most promising areas of aerospace materials science [2][3][4].…”

Properties of Complex Inorganic Solids 2

“…The main reasons are that they tend to be intrinsically very strong, possess high elastic moduli and have low self-diffusion coefficients and thus a high creep strength as well as corrosion resistance. The intermetallics that have been in use for a long time are alloys of Ni and Al, such as superalloys containing Ni 3 Al particles (see, for example, Nabarro 1994; Stoloff and Liu 1996) and NiAl based alloys (see, for example, Darolia, et al 1992; Noeb'e, et al 1996) as well as Fe-Al alloys (Stoloff 1998). In recent years the development and investigation of new intermetallics that are believed to supersede the Ni-Al and Fe-Al based alloys has been pursued very actively.…”