Effects of thermomechanical history and environment on the fatigue behavior of (β)-Ti-Nb implant alloys
作者： André Reck , Stefan Pilz , Ulrich Thormann , Volker Alt , Annett Gebert
DOI: 10.1051/MATECCONF/201816506001
关键词:
摘要: This study examined the fatigue properties of a newly developed cast and thermomechanical processed (β)-Ti-40Nb alloy for possible application as biomedical due to exceptional low Young’s modulus (64-73 GPa), high corrosion resistance ductility (20-26%). Focusing on influence two microstructural states with fully recrystallized β-grain structure well an aged condition nanometer-sized ω-precipitates, tension-compression tests (R=-1) were carried out under lab-air showed significant differences depending β-phase stability cyclic loading. Present ω- precipitates stabilized against martensitic α’’ phase transformations leading increased limit 288 MPa compared state (225 MPa), where mechanical polishing subsequent loading led formation α’’-phase metastability β-phase. Additional studied commercially available (β)-Ti-45Nb revealed slightly higher strength (300 MPa) suggest change in dominating deformation mechanisms according sensitive dependence Nb-content. Further simulated body fluid (SBF) at 37°C no decrease effect prove excellent this type given test conditions.
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