中文摘要：

研究了Ti811钛合金表面电火花强化层的界面成分分布、耐磨和微动疲劳性能。研究结果表明：以0Cr18Ni9合金为电极材料在Ti811钛合金表面进行电火花处理可以形成合金层，显著提高了钛合金表面硬度和耐磨性能。但由于合金层硬度高，韧性较低，在微动疲劳（FF）过程中易萌生裂纹并快速扩展进入基体，致使高温下钛合金FF抗力降低。对电火花强化层进行喷丸强化（SP）后处理能够使钛合金FF抗力恢复到裸件的水平。

英文摘要：

The constituent distribution, the wear resistance and fretting fatigue resistance （FFR） of electrospark strengthening layer on Ti811 titanium alloy were investigated. The results indicate that alloying layer could be produced by electrospark surface strengthening （ESS） on Ti811 titanium alloy with 0Cr18Ni9 electrode. Thus the hardness and wear resistance of Ti811 alloy are increased remarkably. But the hardness of 0Cr18Ni9 alloying layer is high with low ductility, so cracks easily initiate and extend into the bulk material quickly in the process of fretting fatigue （FF）. Therefore the FFR of the titanium alloy treated by ESS is lower than that of the untreated specimen at elevated temperature. Shot peening （SP） can improve the FFR of the titanium alloy treated by ESS to the level of untreated specimen.