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最近几年,离子注入对金属材料的表面改性受到人们愈来愈多的注重。通过离子注入可以使金属或合金的表层结构发生变化,从而达到材料表面改性的目的。金属或合金经离子注入后,一般都能改善其在空气下的疲劳寿命,提高疲劳极限。然而,在腐蚀介质与机械应力的共同作用下,离子注入层的耐疲劳性要明显降低。我们选择α/β型Ti-6Al-4V合金进行研究,目前的工作表明,C~+注入到Ti-6Al-4V合金中,在R=0疲劳试验条件下,可提高空气下的疲劳极限28％。但是在腐蚀环境与交变应力的共同作用下,C~+注入层不能保持象空气疲劳中的那种优良性能,腐蚀疲劳寿命仅稍微得到改善。
In recent years, ion implantation of metal surface modification by the people more and more attention. Through the ion implantation can make the surface structure of the metal or alloy changes, so as to achieve the purpose of surface modification of the material. Metal or alloy by ion implantation, the general can improve its fatigue life under air, improve fatigue limit. However, under the combined action of corrosive media and mechanical stress, the fatigue resistance of the ion-implanted layer is significantly reduced. We have chosen α / β Ti-6Al-4V alloys for research. Current work has shown that C ~ + can be infused into Ti-6Al-4V alloys and increase the fatigue limit under air under R = 0 fatigue test. 28 %. However, under the combined effect of corrosive environment and alternating stress, the C ~ + implanted layer can not maintain the excellent performance like air fatigue, and the corrosion fatigue life is only slightly improved.