Ultrasonic Nanocrystalline Surface Modification (UNSM) Technique towards Improving Mechanical and Tribological Properties of Metallic Materials ald Ceramics

This paper is intended as an introduction to the newly developed ultrasonic nanocrystalline surface modification (UNSM) technique. In principle, this technique produces nanostructured materials (NMs) that are produced through the application of severe plastic deformation (SPD) to conventional coarse-grained (CG) materials. This paper focuses on the state-of-the-art of UNSM technique with recent experimental results of metallic materials. Recently, this technique has also been applied to sintered ceramics and the effectiveness of UNSM technique on the microstructural, mechanical and tribological properties are presented and discussed in this study.