Modelling of tribological behavior and wear for micro-textured surfaces of Ti2AlNb intermetallic compounds machined with multi-dimensional ultrasonic vibration assistance

Abstract

Employing multi-dimensional ultrasonic vibration machining (MDUVM), Ti2AlNb intermetallic compounds were processed to generate highly consistent and uniformly arranged micro-texture surfaces. Compared to conventional machining (CM) surfaces, MDUVM surfaces exhibited a noticeable 10.9 % increase in hardness. Sphere-on-disk friction wear tests indicated a noteworthy 15 % reduction in both friction force and coefficient on MDUVM surfaces. The MDUVM surfaces improved contact pressure distribution, reduced oxidation, and facilitated smoother wear debris transition within the wear zone. As a result, the spread of wear into deeper layers was effectively inhibited. An Archard-based predictive model was developed to quantitatively predict wear behavior by incorporating surface micro-texture, confirming the significant influence of surface morphology on frictional wear, which was consistent with experimental findings.