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M: Metallphysik
M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)
M 32.39: Poster
Monday, March 7, 2005, 14:30–16:30, Poster TU B
Analysis of Ordering and Site Occupancies in TiAlNb — •Torben Boll1, Talaat Al-Kassab1 und Zhi-Guo Liu2 — 1Institut für Materialphysik der Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen — 2Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Titanium-aluminium-alloys with small amounts of Niobium were prepared under high vacuum conditions by means of levitation melting. Heat treatment in the temperature range of 1250 K for several hours were performed.
The samples were investigated with field ion microscopy (FIM) and tomographic atom probe (TAP). Special attention was paid to the distribution of Nb in the γ-phase, where it, as FIM-analysis indicates, preferentially occupies Ti-sites. A new algorithmic approach based on TAP-data was developed to evaluate the site occupancies in ordered structures. Preliminary results, obtained with this method, will be presented and discussed for the site occupancy of Nb along a <001>-direction in these alloys.