Superficies y Vacío
Preparación del Manuscrito

A discussion of the behavior of titanium under high energy ion implantation
J. Rickards
Instituto de Física, UNAM

Ion implantation has been used routinely for more than 30 years.  In this period a great amount of information has been collected on the physical processes involved in ion implantation in solids, spanning topics such as stopping power, radiation damage, sputtering, ion mixing, defects, diffusion, and many others.  Many models, like the spike model, have been developed to explain these processes, and detailed calculations have been made, for instance, using molecular dynamics and Monte Carlo techniques.  In spite of the copious knowledge that has accumulated, new effects are still being observed, partly due to increasing the energy regime, but also to the availability of new more sensitive experimental techniques.  Recent results [1,2] of the formation of a new phase in titanium and the alloy Ti-6Al-4V when they are bombarded with different MeV energy ions will be discussed, and their relation to various models.  The appearance of the new phase does not depend on type of implanted ion (C, Si, Ti, Pt and Au), so chemical effects are ruled out.  The amount of the new phase produced does not follow the regular behavior of the nuclear stopping power, which in this energy regime is orders of magnitude more intense for heavy ions than for light ions.  Therefore the application of the displacement and thermal spike model must be investigated further.

The support of CONACYT projects F036-E9109 and G0010-E is acknowledged.
[1] R. Trejo-Luna, L.R. de la Vega, J. Rickards, C. Falcony and M. Jergel, J. Mater. Sci. 36(2001)503.
[2] L.R. de la Vega, R. Trejo-Luna, J. Rickards, C. Falcony and L. Baños, to be published.

Información General
Formato del  Resumen
Información para Exhibidores