Title: Study on the tribological behaviour of surface gradient nanostructure in TB8 titanium alloy

Authors: Yu Liu; Hao Cui; Shuzhang Pan; Yusheng Xia; Xiaohui Zhao

Addresses: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China ' School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China ' School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China ' School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China ' Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, China

Abstract: The tribological behaviour of TB8 titanium alloy with gradient nanostructure prepared by ultrasonic surface rolling process (USRP) was investigated under four lubricating conditions. Results showed that grains near the strengthened surface are refined to nanoscale with random orientation, and gradually coarsen as going deep into the matrix. The highest COF and wear volume are found in dry friction, followed by 0.9% NaCl condition, 15% hyaluronic acid condition, and finally the 25% fetal bovine serum condition. The average COF and wear volume show a descending trend with the increase of USRP load, and the wear reduction brought by lubricating medium becomes increasingly apparent as USRP load rises. The best wear resistance is obtained for 600 N USRP samples in 25% fetal bovine serum solution. Such results are due to the different lubricating films formed between friction surfaces, where macro proteins act as an important role.

Keywords: TB8 titanium alloy; ultrasonic surface rolling process; surface nanocrystallisation; tribological behaviour.

DOI: 10.1504/IJSURFSE.2022.125457

International Journal of Surface Science and Engineering, 2022 Vol.16 No.3, pp.238 - 257

Received: 21 Dec 2021
Accepted: 15 Mar 2022
Published online: 09 Sep 2022 *

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