Effects of thermomechanical history and environment on the fatigue behavior of (β)-Ti-Nb implant alloys
| Autor: | Christian Heiß, Mariana Calin, Stefan Pilz, Volker Alt, Annett Gebert, Martina Zimmermann, Ulrich Thormann, André Reck |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Simulated body fluid 0206 medical engineering Alloy Modulus 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 020601 biomedical engineering Fatigue limit Corrosion Corrosion fatigue lcsh:TA1-2040 Martensite engineering Composite material 0210 nano-technology Ductility lcsh:Engineering (General). Civil engineering (General) |
| Zdroj: | MATEC Web of Conferences, Vol 165, p 06001 (2018) |
| Popis: | This study examined the fatigue properties of a newly developed cast and thermomechanical processed (β)-Ti-40Nb alloy for a possible application as biomedical alloy due to exceptional low Young’s modulus (64-73 GPa), high corrosion resistance and ductility (20-26%). Focusing on the influence of two microstructural states with fully recrystallized β-grain structure as well as an aged condition with nanometer-sized ω-precipitates, tension-compression fatigue tests (R=-1) were carried out under lab-air and showed significant differences depending on the β-phase stability under cyclic loading. Present ω- precipitates stabilized the β-phase against martensitic α’’ phase transformations leading to an increased fatigue limit of 288 MPa compared to the recrystallized state (225 MPa), where mechanical polishing and subsequent cyclic loading led to formation of α’’-phase due to the metastability of the β-phase. Additional studied commercially available (β)-Ti-45Nb alloy revealed slightly higher fatigue strength (300 MPa) and suggest a change in the dominating cyclic deformation mechanisms according to the sensitive dependence on the Nb-content. Further tests in simulated body fluid (SBF) at 37°C showed no decrease in fatigue strength due to the effect of corrosion and prove the excellent corrosion fatigue resistance of this alloy type under given test conditions. |
| Databáze: | OpenAIRE |
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