Synthesis and characterization of multicomponent (CrNbTaTiW)C films for increased hardness and corrosion resistance

(creator_code:org_t)

Elsevier BV, 2018
2018
Engelska.
Ingår i: Materials & design. - : Elsevier BV. - 0264-1275 .- 1873-4197. ; 149, s. 51-62

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Abstract Ämnesord

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Multicomponent carbide thin ﬁlms of (CrNbTaTiW)C (30–40 at.% C) with different metal contents were depos-ited at different temperatures using non-reactive DC magnetron sputtering. The lattice distortion for the metallattice was estimated to vary from about 3 to 5%. Most ﬁlms crystallized in the cubic B1 structure but Ta/W-rich ﬁlms deposited at 600 °C exhibited a tetra gonal distortion. X-ray diffraction results sh ow that near-equimolar ﬁlms exhibited a strong (111) texture. In contrast, Ta/W-rich ﬁlms exhibited a shift from (111) to(100) texture at 450 °C. The in-plane relationship was determined to MC(111)[-12-1]//Al2O3(001)[110] with alattice mismatch of about 11% along the Al2O3[110] direction. A segregation of Cr to the grain boundaries was ob-served in all ﬁlms. The microstructure was found to be the most important factor for high hardness. Less denseNb-rich and near-equimolar ﬁlms deposited at low tem peratures exhib ited the low est hardnes s (12 GPa),while very dense Ta/W-rich high temperature ﬁlms were found to be the hardest (36 GPa). No correlation wasfound between the lattice distortion and the hardness. Corrosion studies revealed that the multicomponentﬁlms exhibited excellent corrosion resistance, superior to that of a reference hyper-duplex stainless steel, in1.0 M HCl.

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