Surface modification of Ti-6Al-4V alloys manufactured by selective laser melting: Microstructural and tribo-mechanical characterization
|Author/s||Torres Hernández, Yadir
Gotor Martínez, Francisco José
Peón Avés, Eduardo
Beltrán, Ana M.
González, Jesús E.
|Department||Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte|
|Abstract||Medical grade of both titanium (Ti) and Ti6Al4V alloy are recognized as the metallic biomaterials with the better
outcomes for clinical repair of bone tissue thanks to their suitable mechanical properties and corrosion ...
Medical grade of both titanium (Ti) and Ti6Al4V alloy are recognized as the metallic biomaterials with the better outcomes for clinical repair of bone tissue thanks to their suitable mechanical properties and corrosion resistance. However, those Ti advantages are not enough to avoid failure risks of bone implants; between 5 and 10% of Ti implants fail due to a deficient osseointegration, within 5 years of post-implantation. Most of these failures indicate the necessity of getting a better biomechanical-biofunctional balance. Microstructural and tribomechanical characterizations were performed on Ti6Al4V samples obtained by selective laser melting and subjected to different surface treatments (thermal stress relief, acid etching, chemical treatment and thermochemical treatment). Scanning electron microscopy and X-ray diffraction were used for detailed characterization of the elemental composition, phase analysis and surface morphology. Micro-hardness and scratch tests were employed to evaluate the tribo-mechanical properties, which were improved after consecutive surface treatments. Protuberances with spherical morphology, as a remainder of the original powder, were present on the surface. The resulting modified surfaces were constituted by rutile (major phase) and anatase (minor phase). Submicro-nano-topographies were obtained after the chemical and thermochemical treatments.
|Funding agencies||Junta de Andalucía
Ministerio de Economía y Competitividad (MINECO). España
|Citation||Torres Hernández, Y., Sarria, P., Gotor Martínez, F.J., Gutiérrez, E., Peón Avés, E., Beltrán Custodio, A.M. y González, J.E. (2018). Surface modification of Ti-6Al-4V alloys manufactured by selective laser melting: Microstructural and tribo-mechanical characterization. Surface and Coatings Technology, 348, 31-40.|