Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
M: Metallphysik
M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)
M 32.41: Poster
Montag, 7. März 2005, 14:30–16:30, Poster TU B
Segregation and Clustering of Phosphorus at Grain Bounderies of Nanocrystalline Cobalt — •Catharina Wille1, Taláat Al-Kassab1, Reiner Kirchheim1, Melina da Silva2, and Uta Klement2 — 1Georg-August-Universität Göttingen, Institut für Materialphysik, Friedrich-Hund-Platz 1, D-37075 Göttingen — 2Chalmers University of Technology, Department of Material Science and Engeneering, SE-412 96 Göteborg, Schweden
Nanocrystalline Co-1.2at%P and Co-2.1at%P layers with a thickness of 70-200 µm and a grain size of around 10 nm were prepared by pulsed current electrodeposition. These specimens were investigated by Field Ion Microscopy (FIM), Tomographic Atom Probe (TAP) and Transmission Electron Microscopy (TEM) both in the as prepared state and after different heat treatments.
The results reveal already a P-segregation at the grain boundaries in the as prepared state. In addition to normal and abnormal grain growth, the Co-1.2at%P alloy exhibited the formation of Co2P- and CoP-precipitates at grain boundaries after isochronal thermal annealing. In this paper, preliminary results of grain growth and segregation behavior as a function of temperature and time of annealing for the Co-2.1at%P alloy will be presented. The findings will be compared to the ones observed in the Co-1.2at%P alloy.