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MM: Metall- und Materialphysik

MM 25: Poster Session

MM 25.32: Poster

Mittwoch, 29. März 2006, 15:30–17:30, P4

The influence of elastic strain on the early stages of decomposition in CuCo alloys — •Alexander Heinrich, Talaat Al-Kassab, and Reiner Kirchheim — Institut für Materialphysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

The early stages of nucleation in CuCo alloys with low supersaturation have always been of great interest to materials science as they are ideal model systems for phase separation. The authors would like to discuss results obtained with the Tomographic Atom Probe (TAP) and the Field Ion Image Tomography on the early stages of decomposition, annealed for times from one minute to one week at temperatures ranging from 703K to 853K. By means of a newly developed algorithm the determination of a radial distribution function is possible. Hence, it enables to detect initially small deviations from the homogeneous state and characterize clusters and precipitates with respect to size, morphology, number density and composition in all stages of nucleation. In addition, it was possible to quantify the formation of chains of precipitates owing to the influence of elastic strain. The results provide some new aspects to the decomposition path especially in the CuCo-system and will be discussed in terms of the linear elasticity theory.