Mechanical and Physical Properties of Ni3Al-Based Alloys with Cr Carbides Dispersion
Ni3Al-based alloys possess good oxidation resistance, moderate room and high temperature strength and ductility. Introduction of Cr-carbide particles through a solidification route is attempted to provide higher hardness and wear resistance. The mechanical and physical properties are measured at room temperature for several alloys with various carbon concentrations up to 2.0 wt.%. Hardness and wear resistance as well as compressive strength increase with increasing carbon concentration, while bend ductility decreases. Adhesion between carbides and matrix phase is good, and cracks propagate mainly through carbides. The crystallographic orientation relationships between constituent phases are also attempted using electron back-scattering diffraction (EBSD) technique. The thermal conductivity is found to be less sensitive to the alloy composition.
Young Won Chang, Nack J. Kim and Chong Soo Lee
S. Miura et al., "Mechanical and Physical Properties of Ni3Al-Based Alloys with Cr Carbides Dispersion", Materials Science Forum, Vols. 561-565, pp. 439-442, 2007