Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 37: Mechanical Properties I
MM 37.2: Vortrag
Mittwoch, 13. März 2013, 12:00–12:15, H26
Microstructure and mechanical properties of the ductile multicomponent Ti-based alloys — •Ilya Okulov1,2, Simon Pauly1, Uta Kühn1, Tom Marr1,2, Jens Freudenberger1,3, Juliane Scharnweber3, Carl-Georg Oertel4, Werner Skrotzki4, Ludwig Schultz1,2, and Jürgen Eckert1,2 — 1IFW Dresden, 01171 Dresden, Germany — 2TU Dresden, Institute of Material Science, 01062 Dresden, Germany — 3TU Bergakademie Freiberg, Institute Of Materials Science, 09599 Freiberg, Germany — 4TU Dresden, Institute of Structural Physics, 01062 Dresden, Germany
The decreasing volume fraction of intermetallic phases in nano/ultrafine-grained Ti-based alloys results in significant changes of the plasticity in tension. The Ti-based alloys were designed based on Ti66Nb13Cu8Ni6.8Al6.2 reported by Kuhn[1] and prepared by non-equilibrium processing under high cooling rates. The microstructure of these alloys consists of a dendritic bcc β-Ti solid solution and fine intermetallic phases, which precipitate in the interdendritic regions. The volume fraction of the strong but brittle intermetallic compounds significantly decreases with slight decreases in the Cu and Ni content. Consequently, the failure mechanism in tension changes from cleavage to shear fracture. The Ti71.8Nb14.1Cu4Ni3.4Al6.7 alloy demonstrates already in the as-cast state a pronounced tensile ductility of about 5.2%.
This work has been supported by the European Union and the Free State of Saxonia in the framework of ECEMP, contract no. 13853/2379.
[1] Kühn, U. et al., Journal of Applied Physics 98, (2005).