Adhesive wear of a Ti6Al4V tribopair for a fast friction contact

Friction tests at high sliding velocity are carried out by subjecting specimens to an apparent normal pressure of 110MPa in the range of 40–64m/s to reproduce severe conditions of contact between the rotating blades and the rotor in aircraft engines. Therefore, impacts of a projectile against a fixe...

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Bibliographic Details
Published in:Wear 2014-12, Vol.320, p.25-33
Main Authors: Chassaing, G., Faure, L., Philippon, S., Coulibaly, M., Tidu, A., Chevrier, P., Meriaux, J.
Format: Article
Language:English
Subjects:
Adhesive wear
Applied sciences
Chemical Sciences
Coefficient of friction
Contact
Contact of materials. Friction. Wear
Devices
Dry friction
Exact sciences and technology
Friction
High sliding velocity
Material chemistry
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Projectiles
Sliding
Ti6Al4V
Titanium base alloys
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Summary:Friction tests at high sliding velocity are carried out by subjecting specimens to an apparent normal pressure of 110MPa in the range of 40–64m/s to reproduce severe conditions of contact between the rotating blades and the rotor in aircraft engines. Therefore, impacts of a projectile against a fixed sample are carried out for the investigation of a pair of Ti6Al4V materials. A mean coefficient of friction has been ascertained by two types of method: a tribometer device and an energetic approach. A slight sensitivity of the coefficient of friction with respect to the sliding velocity is observed. Postmortem analyses of samples reveal a decomposition of the frictional subsurface in multiple distinct layers: initial microstructure, severe plastic deformation (shear strain up to 16), phase transformation (T>980°C) and material transfer. A scenario of the adhesive wear mechanism is proposed in four steps. •Dry friction generated by a projectile impact against a couple of samples in titanium alloy in rest.•Sliding velocities ranging from 40m/s to 64m/s under an apparent normal pressure of 110MPa.•Analyses of the material microstructure: confirmation of a decomposition into sub-layers.•Adhesive wear rate depending on the sliding duration.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2014.08.001