title: Fatigue performance of medical Ti6Al4V alloy after mechanical surface treatments.
abstract: Mechanical surface treatments have a long history in traditional engineering disciplines, such as the automotive or aerospace industries. Today, they are widely applied to metal components to increase the mechanical performance of these. However, their application in the medical field is rather rare. The present study aims to compare the potential of relevant mechanical surface treatments on the high cycle fatigue (R = 0.1 for a maximum of 10 million cycles) performance of a Ti6Al4V standard alloy for orthopedic, spinal, dental and trauma surgical implants: shot peening, deep rolling, ultrasonic shot peening and laser shock peening. Hour-glass shaped Ti6Al4V specimens were treated and analyzed with regard to the material's microstructure, microhardness, residual stress depth profiles and the mechanical behavior during fatigue testing. All treatments introduced substantial compressive residual stresses and exhibited considerable potential for increasing fatigue performance from 10% to 17.2% after laser shock peening compared to non-treated samples. It is assumed that final mechanical surface treatments may also increase fretting wear resistance in the modular connection of total hip and knee replacements.
authors.affiliation: Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, Heidelberg, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Sonntag
authors.affiliation: Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, Heidelberg, Germany.
authors.forename: Jörn
authors.initials: J
authors.lastname: Reinders
authors.affiliation: Institute of Applied Materials, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Gibmeier
authors.affiliation: Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, Heidelberg, Germany.
authors.forename: J Philippe
authors.initials: JP
authors.lastname: Kretzer
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials; D019245:Compressive Strength; D019544:Equipment Failure Analysis; D006801:Humans; D008422:Materials Testing / Q000295:instrumentation / Q000379:methods; D019736:Prostheses and Implants; D011475:Prosthesis Failure; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; C031462:titanium alloy (TiAl6V4); D014025:Titanium
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