title: Fatigue endurance of Ti-6Al-4V alloy with electro-eroded surface for improved bone in-growth.
abstract: Ti-6Al-4V hour-glass shaped rotating beam specimens with duplex microstructure were processed by electric discharge machining (EDM). A comparatively high peak current of 29A was utilized in order to increase surface roughness for improved osteointegration. High cycle fatigue (HCF) tests were performed in rotating beam loading (R=-1) on these EDM specimens and results were compared with electrolytically polished specimens serving as reference. As expected, the HCF performance of EDM specimens was inferior to the electrolytically polished specimens. A detailed study of fatigue crack nucleation and microcrack growth was carried out on failed specimens by SEM. The poor HCF strength of EDM specimens is explained by early crack nucleation due to the high notch sensitivity of Ti-6Al-4V. In addition, process-induced residual tensile stresses and microstructural effects may also account for the drastic loss in HCF performance relative to the electropolished baseline.
authors.affiliation: Charles University, Department of Physics of Materials, Prague, Czech Republic. janecek@met.mff.cuni.cz
authors.forename: Miloš
authors.initials: M
authors.lastname: Janeček
authors.forename: František
authors.initials: F
authors.lastname: Nový
authors.forename: Josef
authors.initials: J
authors.lastname: Stráský
authors.forename: Petr
authors.initials: P
authors.lastname: Harcuba
authors.forename: Lothar
authors.initials: L
authors.lastname: Wagner
mesh_terms: D000497:Alloys / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry; D001842:Bone and Bones / Q000166:cytology*; D049109:Cell Proliferation; D017097:Electric Impedance; D004560:Electricity; D004566:Electrodes; D055595:Mechanical Phenomena; D019736:Prostheses and Implants; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry; D014639:Vanadium / Q000737:chemistry
chemical_list: D000497:Alloys; D014639:Vanadium; D000535:Aluminum; D014025:Titanium