Dresden 2006 – scientific programme

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MM: Metall- und Materialphysik

MM 38: Nanostructured Materials II

MM 38.4: Talk

Thursday, March 30, 2006, 17:15–17:30, IFW D

Ductile ultrafine eutectic in Ti-Fe-base alloys — •J. Das^1,2, K. B. Kim¹, F. Ettinghausen¹, W. Xu¹, W. Löser², and J. Eckert¹ — ¹FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany — ²Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany

A Ti67.79Fe28.36Sn3.85 ternary alloy has been prepared through arc-melting and solidification at a cooling rate of 40-10 K/s. The as-prepared microstructure of the button-shape ingot exhibits a two phase ultra-fine eutectic consisting of FeTi (Pm3m, B2) and beta-Ti (Im3m, A2) phases. The mechanical properties (maximum strength = 1939 MPa, strain to fracture = 13.5%) are considerably improved compared to the Ti70.5Fe29.5 binary eutectic alloy (maximum strength = 1733 MPa, strain to fracture = 3.4%). The improvement of the strength and plastic deformability is assessed in terms of a detailed investigation of the microstructure and fractographic studies. The presence of Sn is believed to boost the ease of slip transfer across the interface between the A2/B2 phases due a higher lattice mismatch between the structures. This work was funded by European Union within the framework of the Research Training Network on No-dqductile bulk metallic glass compositesNo-dq (MRTN-CT-2003-504692) and by Alexander-von-Humboldt Foundation.