IMPROVEMENT ON FATIGUE LIFE OF Ti-6Al-4V ALLOY BY CARBON ION IMPLANTATION
碳离子注入对Ti—6Al—4V合金疲劳寿命的改善

The fatigue limit of Ti-6Al-4V alloy could be improved over 28% byimplantation of a dose of 3×10~(17) ion/cm~2 of C at 80 keV under stress-controlledtension-zero condition. The microstructure of surface layer, whether implanted ornot, and before or after fatiguing, as well as the concentration distribution of imp-lanted ion along the depth of surface layer were examined by SEM, TEM andSIMS. A great deal of radiation damages and a good many fine TiC particles arefound in the implanted layer. The fatigue cracking origins, implanted or not, occurin subsrface under lower stress and longer fatigue life. And the implanting speciesdiffuse into substrate under cyclic loading.