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本文介绍了利用高频疲劳试验机配以一定的附件，测定ＴＣ３钛合金常规疲劳及微动磨损疲劳（简称微动疲劳）的Ｓ－Ｎ曲线。对该合金进行激光、等离子喷镀和喷丸试样的微动疲劳性能显著改善。利用ＴＥＭ及Ｘ光衍射法分析了喷丸试样表层位错密度及残余应力的变化。用错位偶极子及小裂纹的概念分析了微动疲劳裂纹的萌生和扩展机理，从而解释了表面处理对微动疲劳的影响机制。
This paper describes the use of high-frequency fatigue testing machine with a certain attachment, TC3 titanium alloy conventional fatigue and fretting wear fatigue (referred to fretting fatigue) S-N curve. The alloy was laser, plasma spraying and shot peening fretting fatigue properties significantly improved. The surface layer dislocation density and residual stress of shot peening were analyzed by TEM and X-ray diffraction. The mechanism of fretting fatigue crack initiation and propagation was analyzed by the concept of dislocation dipole and small crack, and the mechanism of the effect of surface treatment on fretting fatigue was explained.