OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 3 2023 Fig. 5. Distribution of elements in the structure of the coating obtained by surfacing a powder mixture with 10 % CrB: a – microstructure of the analyzed region; b – Cr; c – Mn; d – Fe; e – Co; f – Ni. The red square denotes the same analyzed region a b c d e f X-ray diffraction analysis of the surfaced layers The diffraction patterns of the coatings obtained from powder mixtures with different CrB content are shown in fig. 7. The complexity of the analysis of the obtained patterns lies in the fact that a large number of borides or boride-based solid solutions belong to the same space symmetry groups and have close positions of diffraction maxima. Consequently, in fig. 7, only the space group is indicated without specifying the composition of the phase. In all samples, the formation of a solid solution with an fcc (Fm-3m) crystal lattice was observed. Specifically, the coating obtained without the addition of CrB particles had a single-phase structure. In samples with 5 % and 10 % CrB, weak reflections were found around 2Θ of 31°, 56°, and 78°, which corresponds to a presence of a boride with an orthorhombic crystal lattice (Fddd). Cr2B, Mn2B, as well as solid solutions on its basis, namely (Cr,Fe)2B and (Cr,Mn)2B, have such a lattice. a b c Fig. 6. Typical microstructure of the interfaces between a substrate and coatings obtained by surfacing the powder mixtures with different CrB content: CrB: a – 5 % CrB; b – 10 % CrB; c – 30 % CrB
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