目的 利用慢速搅拌摩擦加工，获得工业纯钛细晶组织，提高其耐磨性能。方法 采用慢速搅拌摩擦加工对TA2工业纯钛退火板材进行表面处理，获得细晶结构。使用EBSD技术和显微硬度检测仪对表面微观结构及力学性能进行表征。采用球盘式摩擦磨损试验仪对搅拌摩擦加工前后的样品进行摩擦磨损性能测试，计算磨损率，并使用SEM及EDS分析磨痕特征。结果 搅拌摩擦加工处理后，工业纯钛晶粒尺寸显著细化，小角度晶界比例较高，加工硬化程度高。搅拌摩擦加工样品氧化磨损较为严重，粘着磨损程度减小。搅拌摩擦加工后，样品主要磨损方式由粘着磨损和二体磨损转变为氧化磨损和三体磨损。经过180 r/min、25 mm/min处理的工业纯钛磨损率仅为未加工样品的1/4左右。结论 慢速搅拌摩擦加工可同时提高工业纯钛表面硬度及耐磨损性能，较小的晶粒尺寸及合适的加工硬化程度可减轻粘着磨损和磨粒磨损。

The work aims to obtain fine grain microstructure of commercial pure Ti by means of friction stir processing (FSP) at low rotation speed, and improve abrasion resistance of the microstructure. Fine grain microstructure was obtained by applying low rate friction stir processing to TA2 commercial pure Ti. Surface microstructure and mechanical properties were characterized by using EBSD technology and microhardness tester. Ball-disc type friction-wear tester was used for friction-wear property test of the samples before and after friction stir processing, and also calculate wear rate. Characteristics of wear traces were analyzed by SEM and EDS. After the friction stir processing, grain size of commercial pure Ti was refined significantly, fraction of low-angle boundary (LAGB) and work-hardening capacity were increased. For the samples treated by friction stir processing, oxidation wear became worse and adhesive wear was reduced. The main wear mechanism changed from adhesive wear and two-body wear to oxidation wear and three-body wear after friction stir processing. Wear rate of friction stir processed Ti at the rotation speed of 180 r/min and traverse speed of 25 mm/min was a quarter of that of untreated Ti. Surface hardness and abrasion resistance are increased by friction stir processing at low rotation speed. Adhesive wear and abrasive wear can be mitigated by smaller grain size and proper work-hardening capacity.