Abstract
With preplaced Ti-8Al-1Mo-1V + BN powder mixtures, the Ti-base composite coatings with in-suit synthesis nano particulates were obtained by laser cladding on titanium alloy substrate. The microstructures, fracture morphology, phase composition and mechanical property were studied by SEM, XRD and micro-hardness tests. The results show that, there are two kinds of typical nano particulates in the composites, i.e. the TiB with a diameter of ~400nm and the Ti2N with a diameter of ~10 nm. Both the TiB and Ti2N reinforced particulates are uniformly distributed in the composites. As a result, the average hardness of the composites were ~360HV0.05 which is about 20% higher than the substrate. In the composites, the distribution of Ti2N particulates shows a peculiar characteristic of dendrite-like morphologies. The analysis shows that the Ti2N precipitates out from the solid state α-Ti(N) is the reason why Ti2N is only of a diameter of ~10nm and distributes in a certain way of dendrite-like morphologies.
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