Fachbereich 11 - Physik
Institut für Materialphysik
Diffusion in Metals, Intermetallics, Silicides, Quasicrystals and Metallic Glasses

Diffusion in Al-Ti intermetallics

At present Al-Ti intermetallics on the basis of g-TiAl alloys are the most promising materials for high temperature structural materials applications. Many properties of the alloys such as high-temperature stability of the lamellar structure and creep resistance are determined by the diffusion rates in the phases and along interfaces. Therefore the knowledge of diffusion characteristics and fundamental understanding of diffusion mechanisms are of great importance to the research and design of industrial Al-Ti alloys. Third and more element additions to g-TiAl, such as Cr, Nb, B or Fe have been shown to improve the materials performance. Self- and relevant solute diffusion have been investigated by radiotracer- and SIMS-methods in dependence on temperature and alloy composition. Atomic diffusion mechanisms in the compounds Ti3Al and TiAl were analyzed in detail.

Drittmittelgeber:

Deutsche Forschungsgemeinschaft

Beteiligte Wissenschaftler:

Dr. S. V. Divinski, Dr. M. Friesel (Chalmers University of Technology, Göteborg), Prof. Dr. Chr. Herzig (Leiter), Dr. F. Hisker, Prof. Dr. Y. Mishin (George Mason University, Fairfax, VA, USA), Dr. T. Przeorski

Veröffentlichungen:

Herzig, Chr., T. Przeorski, M. Friesel, F. Hisker, S. V. Divinski: Tracer solute diffusion of Nb, Zr, Cr, Fe and Ni in g-TiAl: effect of preferential site occupation, Intermetallics, 9, 461 (2001)

Przeorski, T., M. Friesel, F. Hisker, S. V. Divinski, Chr. Herzig: Solute diffusion in the intermetallic compound TiAl Defect and Diffusion Forum, 194 - 199, 1127 (2001)

Herzig, Chr., Y. Mishin, S. V. Divinski: Bulk and interface boundary diffusion in group IV HCP metals and alloys, Metal. Mater. Trans. 33 A, 765 (2002)