摘要：本文研究模拟体液腐蚀对医用植入钛合金Ti-6Al-4V超高周疲劳性能的影响。采用超声对称拉压疲劳，开展了Ti-6Al-4V在三种不同环境条件下的105~ 109周次范围内的疲劳性能。这三种环境条件分别为：（i） 实验室大气；（ii） 模拟体液浸泡预腐蚀30天；（iii） 加载过程中模拟体液实时喷注。结果显示，疲劳循环超过107 周次后，仍然发生疲劳断裂，并不存在传统意义上的疲劳极限。三种不试验环境同条件下的S-N曲线呈相似的趋势，都是连续下降。模拟体液浸泡预腐蚀，对Ti-6Al-4V超高周疲劳性能性能几乎没有影响。然而，与实验室大气环境条件的试验结果相比，模拟体液喷注显着降低了Ti-6Al-4V疲劳强度。

　　关键词：论文，修改，格式（提供5个左右反映论文主题的关键字）

 Influence of simulated body fluid corrosion on very high cycle fatigue properties of Ti-6Al-4V
LI Jiu-kai¹, LIU Yong-jie¹, He Chao¹, WANG Qing-yuan^1,2*
(1．Key Laboratory of Energy Engineering Safety and Disaster Mechanics, Ministry of Education, College of Architecture and Environment, Sichuan University, Chengdu 610065, China；
School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China)

　　Abstract:This paper is devoted to the effect of simulated body fluid （ SBF ） corrosion on the very high cycle fatigue properties of implanted medical Ti-6Al-4V alloy. Ultrasonic fatigue tests were performed under fully reversed tension between 105 and 109 cycles in three testing conditions and environments: （i） in laboratory air, （ii） in air after SBF pre-corrosion and （iii） under real time SBF flow. Fracture could still occur beyond 107 cycles, it demonstrated that there was no fatigue limit as the traditional fatigue conception described. The results showed that all the S-N curve had the similar tendency and descended continuously during 105 and 109 cycles. And SBF subjection pre-corrosion almost had no effect on the fatuge behavior. However the fatigue strength of the Ti-6Al-4V was remarkably degraded compared with the case tested in laboratory air.

　　Key words:Titanium alloys, Simulated body fluid, Very high cycle fatigue, Ultrasonic fatigue, S-N curve

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