Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 15: Interfaces I
MM 15.2: Talk
Monday, March 22, 2010, 15:00–15:15, H5
Non-equilibrium grain boundary segregation of phosphorus in nickel-base superalloy — Lei Zheng1 and •Tingdong Xu2 — 1Institute for materialphysics, university of Muenster, wilhelm-klemm-str. 10, 48149, Muenster, Germany — 2Superalloy department, Central iron and steel research institute, xueyuan nanlu 76, 100081, Beijing, China
Applying Auger electron spectroscopy, the levels of grain-boundary segregation of phosphorus in a Ni-based superalloy are measured after solution treatment at 1200 °C for 9.8 h or at 1020 °C for 68.5 h and subsequent aging at 720 °C for 2 h. It is found that the levels of segregation increase with the solution treatment temperature. The measurement results are interpreted by the laws of equilibrium and non-equilibrium segregation. Based on this analysis, the concept of non-equilibrium grain-boundary segregation of phosphorus in a superalloy is confirmed for the first time.