Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 58: Topical Session Modern Atom Probe Tomography VI - Ordering, Clustering and Segregation

MM 58.4: Vortrag

Donnerstag, 29. März 2012, 17:45–18:00, H 0107

Decomposition and ordering in Ni-11.3 at.% Ti as studied by Atom Probe Tomography — •Tala'at Al-Kassab¹, Torben Boll¹, Catharina Wille¹, and Bernd Schönfeld² — ¹King Abdullah University of Science and Technology, Division of Physical Sciences, — ²Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich,

Recent results obtained on the decomposition path in Ni-rich Ni-Ti are reported. For this metallic system, there are different reports with respect to the decomposition path at elevated temperatures (around 873 K). As atom probe tomographers are now collecting data in a comparatively large volume, more detailed information may now be deduced, in particular, on the early stages of decomposition. For this study single crystals of Ni-11.3 at.% Ti were grown by the Bridgman technique. Platelets were homogenized at 1443 K, quenched into brine and aged at 873 K for 5, 23, 95 and 219 h, respectively. Tips were then prepared with a <100> axis. Atom Probe Tomography analysis was performed with a position sensitive detection system, named LAWATAP at the newly established Laboratory at King Abdullah University of Science and Technology. The composition of the precipitates and the existence of aging stages will be discussed.