Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 29: Intermetallic phases II
MM 29.1: Vortrag
Donnerstag, 29. März 2007, 11:45–12:00, H16
Site occupation and order in γ-TiAl with ternary additions — •Torben Boll1, Talaat Alkassab1, Zhi-Guo Liu2, and Yong Yuan3 — 1) Institut fuer Materialphysik der Universitat Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen — 2) Laboratory of Solid State Microstructures, Nanjing University, Hankou Road 22, Nanjing 210093, China — 3Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
Titanium-aluminum-samples with additions of 3at.%Cr, 2at.% Ag and 1-10at.% Nb were prepared by means of levitation melting. The expected dual phase structure of α2- and γ-phase could be observed with TEM.
The analysis with atom probe tomography (APT) was focused on the L10-structure of the γ-phase and performed along the superstructure ([001],[110]) and non superstructure ([100]) crystallographic directions.
A new developed algorithm was processed on the APT data to gain information on the site occupation of the ternary additions in the L10-structure. Results based on statistical evaluation of the data for the different samples will be presented. With this approach it is furthermore possible to attain information about the field evaporation field strengths for the components in the structure, which may differ from the field evaporation field strengths of the pure metals as will be discussed.