Titanium and titanium alloys have been restricted in tribology-related field, because of their disadvantages, such as low surface hardness, high friction coefficient and poor wear resistance. Various surface modification techniques have been applied to improve their deficiencies. As a new technology of severe surface plastic deformation, ultrasonic nanocrystal surface modification (UNSM) technique has been widely used to realize the surface treatment of various materials, and also has attracted wide attention in many engineering fields. This review begins with a brief introductionof the basic concept and the modification mechanism of the UNSM technique. The specific applications of the UNSM technique for improving the tribological and fatigue properties of titanium and its alloys were reviewed and summarized.

钛和钛合金由于其缺点，例如低的表面硬度，高的摩擦系数和较差的耐磨性，而在摩擦学相关领域受到限制。已经应用了各种表面改性技术来改善其缺陷。作为一种严重的表面塑性变形的新技术，超声纳米晶体表面改性（UNSM）技术已被广泛用于实现各种材料的表面处理，并且在许多工程领域引起了广泛的关注。这篇综述首先简要介绍了UNSM技术的基本概念和修改机制。综述并总结了UNSM技术在改善钛及其合金的摩擦学和疲劳性能方面的具体应用。