Fatigue properties of a new generation ß-type Ti-Nb alloy for osteosynthesis with an industrial standard surface condition
| Autor: | Mariana Calin, André Reck, Martina Zimmermann, Stefan Pilz, Annett Gebert |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope Laser cutting Mechanical Engineering 0206 medical engineering Metallurgy chemistry.chemical_element Titanium alloy 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 020601 biomedical engineering Fatigue limit Focused ion beam Industrial and Manufacturing Engineering chemistry Mechanics of Materials Modeling and Simulation General Materials Science Composite material 0210 nano-technology Titanium Stress concentration |
| Zdroj: | International Journal of Fatigue. 103:147-156 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2017.05.024 |
| Popis: | This research work focuses on the fatigue behavior of a new metastable Ti-40Nb alloy (wt.%) with a single s-phase microstructure and a low Young’s modulus of 60 GPa. Samples were manufactured by laser cutting and subsequently subjected to an anodized (Type III) surface condition which is currently an industrial standard (Stryker Trauma GmbH). Accompanied by detailed analysis of the fractured surfaces by means of scanning electron microscopy (SEM) including cross section preparation by means of focused ion beam (FIB) at the crack initiation area, the experimental results reveal a large scatter and a fatigue strength of 150 MPa at 2 × 10 6 cycles (R = −1). In-depth surface evaluation before and after the fatigue tests show a variety of large notches distributed along the complete sample radius as a consequence of the laser cutting process. Stress concentration on these surface flaws together with the notch sensitivity of titanium alloys are the major reason for the pronounced scatter of fatigue results accompanied by crack initiation always starting from the surface. Equally tested cp-titanium (ASTM Grade 4) reference samples exhibit a fatigue strength of 200 MPa at 2 × 10 6 cycles. Additionally studied osteosynthesis plates of Ti-40 Nb and cp-4 titanium (hand surgery sector – same surface condition) showed even lower fatigue strength compared to the standard fatigue specimens. |
| Databáze: | OpenAIRE |
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