Microstructure and Properties of (TiB + NiTi)/Ti Composite Coating Fabricated by Laser Cladding.

Agglomerated TiB particle and network-like structure-reinforced titanium matrix composite coatings were prepared by laser cladding of the Ni + TiB + Ti preplaced powders on Ti-6Al-4V alloy. The network-like structure mainly consisted of NiTi and NiTi. Through the experiment, it was found that the size of agglomerated particle gradually decreased with the increase of Ti content, but the number of the network-like structure first increased and then disappeared. In-situ reaction competition mechanism and the formation of network-like structure were discussed. The average micro-hardness gradually decreased with the increase of Ti content, but the average fracture toughness gradually increased. Meanwhile, the wear resistance of the coatings is higher than that of the substrate, but the wear loss of the coatings is gradually increased with the increase of Ti content. [ABSTRACT FROM AUTHOR]