Abstract
The surface structure change and its effect on fatigue response produced by nitrogen and boron implantation were studied in a Ti-24V alloy where the composition is in approximate weight per cent. The surface structure change by ion implantation was identified using transmission electron microscopy, Auger electron spectroscopy and X-ray photoelectron spectroscopy. Nitrogen and boron implantation produced irradiation defects as well as fine titanium nitride and titanium boride precipitates. A dense precipatation was found as a result of the boron implantation. Surface deformation and crack development features were altered at the implanted surface under strain-controlled fatigue conditions and hence changed the fatigue life. Nitrogen implantation slightly improved the strain-controlled fatigue life while boron implantation was detrimental. Both nitrogen implantation and boron implantation enhanced the stress-controlled fatigue life and limit. A particularly marked improvement was observed for boron implantation.
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