Microhardness profile along the depth direction of the laser clad coating is shown in Fig.1.Because of the fine microstructure of hard TiB-TiC reinforcing phase uniformly distributed in TiNi-Ti2Ni dual-phase intermetallic matrix, the coating has an average value of HV580 higher than that of TA15 substrate(HV345), and a uniform hardness distribution. It is worth noting that there is a hardness peak of approximately HV700 near the substrate in the coating. That is because the main phase constitution near the substrate is the hard intermetallic Ti2Ni, as shown in Fig.2(b).
Fig. 1 Microhardness profile along depth direction of laser clad coating
Fig. 2 OM micrograph showing overview longitudinal cross-section (a) and SEM micrograph showing microstructure in coating/substrate transition zone (b) of laser clad coating on substrate of TA15 titanium alloy
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