Fig. 4

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The microstructure and distribution of elements of coating (Zr,Nb)N-(Cr,Zr,Nb,Al)N on transversal cross section; elemental composition: Cr(44.92 at.%) + Zr(36.71 at.%) + Al(9.2 at.%) + Nb(3.03 at.%); average coating thickness: 5.0 µm (1.0 + 4) µm (50 sublayers, with average sublayer thickness of 80 nm).
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