Laser melted TiC reinforced nickel aluminide matrix in situ composites

Abstract

Titanium carbide reinforced nickel aluminide matrix in situ composites were produced using a newly patented laser melting furnace. Microstructure of the laser melted TiC/(Ni 3 Al-NiAl) in situ composites was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results showed that the constituent phases in the laser melted in situ composites are TiC, Ni 3 Al and NiAl. Volume fraction of TiC and NiAl increase with increasing content of titanium and carbon. The growth morphology of the reinforcing TiC carbide has typically faceted features, indicating that the lateral growth mechanism is still predominant growth mode under rapid solidification conditions.

Effect of microstructure morphology on the high temperature tensile properties and deformation in directionally solidified NiAl-Cr(Mo) eutectic alloy

“…A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 5 hypereutectic alloy, the volume fraction of Cr(Mo) phase was larger and fully eutectic could be also obtained [17]. The mechanical properties of in-situ composites are well known to be sensitive to the microstructure morphology and volume fraction of constituent phases, which can be controlled by changing alloy composition and solidification conditions during the process of preparation of eutectic in-situ composites.…”

Microstructure and Tribological Properties of a HfB2-Containing Ni-Based Composite Coating Produced on a Pure Ti Substrate by Laser Cladding

“…15,16,17, and 18 (normal load 10 N, sliding speed from 0.025 to 0.2 m/s), respectively. It can be seen that for the pure Ti substrate, NiCrBSi coating, and HfB 2 -containing composite coating, the worn surface morphologies at different sliding speeds are similar to those at different normal loads.…”

“…However, Ti and Ti-alloys have poor tribological properties, such as a high friction coefficient and low hardness, which greatly limit their engineering applications [7][8][9]. Various surface modification technologies, such as laser cladding, ion implantation, physical vapor deposition (PVD), chemical vapor deposition (CVD), carburizing, nitriding, and oxidation, among others, have been studied [10][11][12], including high-energy density laser cladding, which has been used extensively to prepare the protective coatings for engineering components [13][14][15][16][17].…”

Fabrication of TiC-Reinforced Composites by Vacuum Arc Melting: TiC Mode of Reprecipitation in Different Molten Metals and Alloys

“…It is important at this point to mention, as Cheng and Wang reported in their efforts ( Ref 2,12,13,[19][20][21], that despite the fact that the TiC preserves its faceted character irrespectively of the cooling rate for a given matrix system, different alloy matrices result in different precipitation morphologies (by means of either more blocky or more fibrous, or more dendritic, etc.). This dependence is associated with the fact that different matrices of different natures and compositions result in different elemental diffusion, surface, and interfacial characteristics, and bulk, surface, and interphase thermodynamics all of which affect the developed cooling rate.…”