Effects of Y2O3 on Microstructure and Mechanical Properties of Laser Clad Coatings Reinforced by In Situ Synthesized TiB and TiC
Titanium-based coatings reinforced by in situ synthesized TiB and TiC were deposited on Ti6Al4V by laser cladding. The effects of Y2O3 on microstructure and mechanical properties of the coatings were investigated. The coating without Y2O3 is mainly composed of a-Ti cellular dendrites and an eutecticum in which a large number of coarse and fine needle-shaped TiB and a few equiaxial TiC particles are homogeneously embedded. A small amount of Y2O3 addition can refine the microstructure by transforming a-Ti grains from cellular dendrites to columnar or equiaxial crystals, and can increase the volume fraction of the reinforcements. The addition of Y2O3 can also increase microhardness and reduce the cracking sensitivity of the coating.
Yi Tan and Dongying Ju
J. Li et al., "Effects of Y2O3 on Microstructure and Mechanical Properties of Laser Clad Coatings Reinforced by In Situ Synthesized TiB and TiC", Materials Science Forum, Vols. 675-677, pp. 589-592, 2011