Surface modification of pure titanium via friction stir processing: Microstructure evolution and dry sliding wear performance

摘要

In this study, the microstructural evaluation and wear behavior of multi-processed pure titanium using friction stir (FS) technique was evaluated. The microstructure characterization illustrates that the FS processing produced strong texture in titanium microstructure and induced Widmanstatten morphology formation in the following passes. Therefore, the multi-passes FS processing of pure titanium create the Widmanstatten morphology and improve wear resistance. The improvement in the wear properties of FS processed samples can also be expressed by higher microhardness values, grain size refinement, and higher amount of Widmanstatten morphology. The decrease in worn track width and debris size as a result of the increase in FS processing number implies a decrease in wear rate and a wear mechanism change from adhesive to abrasive. (C) 2019 Elsevier B.V. All rights reserved.