Effect of Vacuum Heat Treatment on the Microstructure and Tribological Property of Ti–6Al–4V Alloy with Cu Coating

Abstract

The effect of vacuum heat treatment on the interface microstructure and tribological property of Cu‐coated Ti–6Al–4V alloy is investigated herein. After the vacuum heat treatment process, a diffusion layer is formed at the interface between the Cu coating and the Ti–6Al–4V substrate. The formed intermetallic compounds at the interface between the Ti–6Al–4V substrate and Cu coating are CuTi2, CuTi, Cu4Ti3, and β‐Cu4Ti. The activation energy of intermetallic compound growth in the diffusion zone of Cu‐coated Ti–6Al–4V is 126.0 kJ mol−1, and the pre‐exponential factor is 0.1 m2 s−1. The tribological properties of the Cu‐coated Ti–6Al–4V alloy are best when subjected to diffusion treatment at 700 °C for 300 min, with weight loss reduced by 58.2% compared to the Ti–6Al–4V alloy. The wear resistance of the Ti–6Al–4V alloy can be enhanced by Cu coating and vacuum diffusion heat treatment, and the formation of the Cu–Ti intermetallic compound contributes to this improvement. These findings offer new insights for further advancements in the tribological properties of titanium alloys.

Influence of Nickel Content on the Formation of an Interaction Zone during Contact Melting of Titanium with Copper-Nickel Alloys

“…Increasing the service life and reliability of products operated in extreme conditions (under contact conditions, at high temperatures, and large, including cyclic, loads) is an urgent problem of modern technology. Binary intermetallic compounds of titanium with copper have high hardness and unique tribological properties combined with high electrical conductivity [1][2][3]. However, along with high hardness, they have low ductility [4,5], which limits their practical use for protecting the surface of titanium, copper, and alloys based on them.…”