离子注入对Ti合金疲劳行为的影响

Effect of Ion Implantation on the Fatigue Behavior of Ti Alloy

研究了碳、硼离子注入对Ti-6Al-4V合金应力控制疲劳行为的影响。研究发现:注入C^+和B^+可分别使合金的疲劳极限提高28％和12％。高能C^+和B^+离子辐射,使合金的注入表面受到极度损伤并且在注入层中形成了许多细小的第二相沉淀粒子。使用透射电镜(TEM)和二次离子质谱(SIMS)研究了疲劳前后注入表面的结构变化。根据表面层微观分析的结果,分析疲劳寿命得到改善的原因。

The effect of ion implantation(carbon and boron)on the stress controlling fatigue behavior of Ti-6Al-4V alloy is studied in this paper. 28% and 12% increases are foand in the endurance limit with carbon and boron implantation respectively. The implanted surface is heavily damaged because of the high energy ion irradiation. There are lots of fine second phase precipitates in the implanted layers. The surface structure changes before and after fatigue by ion implantation are identified using transmission electron microscopy(TEM)and second ion mass spectroscopy(SIMS). A possible reason for improving fatigue lifetime is discussed based on the results from microscopic analysis on the surface laver.