Architecture and Increased Adhesive Strength of Vacuum‐Plasma Coating on Ultrafine‐Grained Titanium Alloy

Abstract

Herein, the research conducted in the field of vacuum‐plasma coating TiVN deposited on the substrate of VT8M‐1 titanium alloy (Ti–5.7Al–3.8 Mo–1.2Zr–1.3Sn) with an ultrafine‐grained (UFG) structure processed by severe plastic deformation (SPD) is explained. The strength characteristics of deposited coating, layer thickness, chemical composition and adhesive properties on substrates with the initial coarse‐grained (CG) and UFG structures are studied. The influence of substrate UFG structure on increasing the hardness of deposited coating and its adhesive characteristics is established. The nature of enhancing the adhesion strength of the coating depending on the substrate microstructure is discussed.

Advanced Materials for Mechanical Engineering: Ultrafine‐Grained Alloys with Multilayer Coatings

“…Another report focused on studying the adhesive strength of a TiVN protective coating on the commercial titanium alloy VT8M‐1 (Ti–5.7Al–3.8Mo–1.2Zr–1.3Sn–0.16Fe) produced by the SPD technique of rotary swaging (RS). [ 87 ] Unlike the architecture of the aforementioned coating, a V underlayer with a thickness of 0.2 μm was deposited on the substrate between the TiVN layers. The architecture of the TiVN coating with a total thickness of ≈6 μm represented two layers visible in scanning electron microscopy (SEM) ( Figure ) but the thin V interlayers were practically undetectable due to their small thickness.…”