Fig.1 shows two optical micrographs of indentation topography on the sectioned surface of Nos. 1 and 2 coatings. It is observed that the two interfaces between the coating and substrate adhere well and the diagonals of interface of No. 1 coating without RE is bigger than that of No. 2 coating with RE, indicating that No. 2 coating with RE has better interface quality than No. 1 coating without RE.
Fig. 1. Optical micrographs of indentation topography on sectioned surface of (a) No. 1 coating, and (b) No. 2 coating.
Fig. 2 shows that microhardness values on the sectioned surface of different coatings vary with the depth normal to the top surface. It can be seen that the average microhardness value of No. 1 coating without RE is much smaller than that of coatings doped with RE. For each coating doped with RE, microhardness values fluctuate less than that of No. 1 coating without RE despite of one or two points varying largely, similar with that of No. 1 coating without RE. Thus it is believed that RE can increase the microhardness value effectively due to the RE refining effect making the microstructure dense, compact and less porous and element distribution more uniform.
Fig. 2. Microhardness values on the sectioned surface of different coatings vary with the depth normal to the top surface (inset is the average of 10 indentation values of each coating, respectively).
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