title: Effect of bulk microstructure of commercially pure titanium on surface characteristics and fatigue properties after surface modification by sand blasting and acid-etching.
abstract: Surface modification techniques are widely used to enhance the biological response to the implant materials. These techniques generally create a roughened surface, effectively increasing the surface area thus promoting cell adhesion. However, a negative side effect is a higher susceptibility of a roughened surface to failure due to the presence of multiple stress concentrators. The purpose of the study reported here was to examine the effects of surface modification by sand blasting and acid-etching (SLA) on the microstructure and fatigue performance of coarse-grained and ultrafine-grained (UFG) commercially pure titanium. Finer grain sizes, produced by equal channel angular pressing, resulted in lower values of surface roughness in SLA-processed material. This effect was associated with greater resistance of the UFG structure to plastic deformation. The fatigue properties of UFG Ti were found to be superior to those of coarse-grained Ti and conventional Ti-6Al-4V, both before and after SLA-treatment.
authors.affiliation: Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia. Electronic address: alexander.medvedev@monash.edu.
authors.forename: A E
authors.initials: AE
authors.lastname: Medvedev
authors.affiliation: Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: H P
authors.initials: HP
authors.lastname: Ng
authors.affiliation: Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia; Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia.
authors.forename: R
authors.initials: R
authors.lastname: Lapovok
authors.affiliation: Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Y
authors.initials: Y
authors.lastname: Estrin
authors.affiliation: Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401 USA.
authors.forename: T C
authors.initials: TC
authors.lastname: Lowe
authors.affiliation: Carpenter Technology Corporation, R&D Building 68, PO Box 14662, Reading, PA 19612-4662, USA.
authors.forename: V N
authors.initials: VN
authors.lastname: Anumalasetty
mesh_terms: D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D014025:Titanium
keywords: Equal channel angular pressing; Fatigue; Nanocrystalline materials; Surface modification; Titanium