Mechanical properties and structure of Ti-6A1-4V alloy implanted with different light ions

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URI: https://hdl.handle.net/11556/4606
ISSN: 0257-8972
DOI: 10.1016/0257-8972(95)08291-3
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1995-10
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The effect of N+ and C- implantation on the properties of Ti-6Al-4V alloy is widely documented. However, some authors claim that other light ions, such as O+ or B+, also have an effect on this alloy, improving its mechanical properties. In this work, Ti-6Al-4V alloy samples have been implanted with C+, N+ and O+ light ions. Energies from 50 to 180 keV and doses of the order of 1017 ion cm-2 have been used, keeping the substrate temperature below 500°C. Mechanical properties such as the hardness or elastic recovery have been evaluated by means of microindentation tests, with a loading-unloading cycle at loads up to 10 mN. An increase in surface hardness of more than 100% has been observed in most of the implanted samples. Pin-on-disc wear tests under lubricated conditions have been performed to evaluate and compare the tribological behaviour of implanted samples against ultrahigh molecular weight polyethylene. A decrease in the friction coefficient from 0.1 to 0.05, resulting from ion implantation, has been observed. Unlubricated wear tests using an alumina ball on a Ti-6Al-4V disc have also been carried out. Wear tracks on the Ti-6Al-4V, evaluated by means of optical profilometry and scanning electron microscopy, have shown that implantation can improve the abrasive wear resistance by two orders of magnitude. X-ray photoelectron spectroscopy analyses also were carried out on selected samples, showing the presence of hard phases, such as oxides or carbides, in the implanted samples.
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Friction , Ion implantation , Ti-6Al-4V , UHMWPE , X-ray photoelectron spectroscopy , General Chemistry , Condensed Matter Physics , Surfaces and Interfaces , Surfaces, Coatings and Films , Materials Chemistry
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Alonso , F , Arizaga , A , Quainton , S , Ugarte , J J , Viviente , J L & Oñate , J I 1995 , ' Mechanical properties and structure of Ti-6A1-4V alloy implanted with different light ions ' , Surface and Coatings Technology , vol. 74-75 , no. PART 2 , pp. 986-992 . https://doi.org/10.1016/0257-8972(95)08291-3