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MM: Fachverband Metall- und Materialphysik
MM 22: Mechanical properties I - Plastic deformation & fracture
MM 22.3: Talk
Tuesday, April 1, 2014, 10:45–11:00, IFW B
Tuning tensile ductility in composite structured Ti-based alloys — •Ilya Okulov1,2, Uta Kühn1, Jens Freudenberger1,3, Werner Skrotzki4, and Jürgen Eckert1,2 — 1IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany — 2Technische Universität Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany — 3Technische Universität Bergakademie Freiberg, Institut für Werkstoffwissenschaft, Gustav-Zeuner- Str. 5, D-09599 Freiberg, Germany — 4Technische Universität Dresden, Institut für Strukturphysik, D-01062 Dresden, Germany
Due to a well-balanced structure, Ti-based ultrafine-dendrite composites exhibit high strength and compressive plasticity already in the as-cast state. They consist of a β-Ti phase surrounded by ultrafine structured intermetallics: the β-Ti phase is ductile and tough one, while the brittle intermetallics effectively strengthen the alloys. The most of Ti-based ultrafine-dendrite composites are brittle in tensile loading. Recently, it was reported that the control of precipitates in the Ti-Nb-Cu-Ni-Al system can significantly enhance tensile ductility and maintaining high yield strength [1]. The approach was successfully applied to several Ti-based systems. And new composite structured alloys with high strength and tensile ductility were developed. For example, Ti68.8V13.6Cu6Ni5.1Al6.5 exhibits the ultimate strength of about 1250 MPa and the tensile ductility of about 4.5%.
1. Okulov et al. - Materials Science and Engineering C, 33 (2013) 4795-4801