Improvement in mechanical properties of NiAl matrix composites fabricated by reaction compocasting

Abstract

With Ni, Al, Fe, Ti and C elemental powders, the NiAl(Fe) matrix composites have been successfully fabricated by the RC technique. The composites consist of three phases, which are β′ and γ′ and TiC, respectively. The TiC particles, with the particle size of 0.2−3μm, tend to be uniformly dispersed in the matrix. The composites not only offer the high elevated temperature strength, but also exhibit the satisfied ambient ductility, which indicates that the shortcomings of the insufficient elevated temperature strength and the poor ambient temperature ductility of stiochiometric NiAl are overcome, and which makes it possible for NiAl(Fe) matrix composites to be used in the high temperature structural applications.