The regularities of wear of titanium alloys PT-3V and VT6 with coarse-grained and ultrafine-grained structure

Abstract

Relevance of the work is caused by the need to improve the tribological characteristics of titanium alloys in order to expand their application. The main aim of the research is to study the regularities of wear of titanium alloys PT-3V and VT6 with coarse and ultrafine grained structure in friction with boundary lubrication; to identify the most significant parameters of ultrafine grained structure that influence wear resistance of alloys PT-3V and VT6; to determine the most optimal regimes of abc-pressing, ensuring the formation of ultrafine-grained structure with parameters increasing the wear resistance of alloys PT-3V and VT6. The methods used in the study: X-ray structural and phase analysis with radiation CoKα, optical metallography, methods of scanning and electron microscopy, electron microprobe analysis method, electron backscatter diffraction method (EBSD) using software CHANNEL 5. The results: the formation in alloys PT-3V and VT6 with ultrafine-grained structure by the methods of severe plastic deformation does not alter the adhesive wear mechanism of these alloys. The wear of alloys PT-3V and VT6 with coarse-grained and ultrafine-grained structure is the result of an adhesive transfer of samples material to a counterbody and formation of a large number of wear particles. When forming a highly nonequilibrium structure it is the nonequilibrium of the structure which has a decisive influence on its wear resistance.

Keywords

• titanium alloys
• wear regularities
• ultrafine-grained structure
• nonequilibrium of structure
• backscatter electron diffraction