Abstract
Long-term exposure at 600 °C of the near-alpha titanium alloy Ti-6Al-2.75Sn-4Zr-0.4Mo-0.45Si (TIMETAL 1100) influences tensile properties and fracture morphology due to microstructural changes by aging as well as environmentally induced effects. The influences of aging and oxygen penetration on the subsurface of the alloy were evaluated individually. Metallographic investigations, microhardness measurements, and Auger electron spectroscopy (AES) were performed to examine the oxygen-affected zone. Whereas ultimate tensile stress (UTS) and 0.2 pct yield stress (YS) are mainly influenced by aging at 600 °C up to 1000 hours in bimodal and lamellar microstructures, ductility sensitivity depends on oxygen embrittlement of the subsurface zone. Hereafter, little strain cracks are initiated which rapidly penetrate into the unaffected material. Fracture morphology which was investigated by scanning electron microscopy changes little during exposure. Ductile fracture exhibiting honeycomb morphology was observed on bimodal microstructure and interlamellar fracture with little ductile portion on lamellar microstructure. The oxygen-penetrated zone fails by brittle fracture.
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Leyens, C., Peters, M., Weinem, D. et al. Influence of long-term annealing on tensile properties and fracture of near-α titanium alloy Ti-6Al-2.75Sn-4Zr-0.4Mo-0.45Si. Metall Mater Trans A 27, 1709–1717 (1996). https://doi.org/10.1007/BF02649829
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DOI: https://doi.org/10.1007/BF02649829