Dresden 2011 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 46: Mechanical Properties III
MM 46.5: Vortrag
Freitag, 18. März 2011, 11:30–11:45, IFW D
Intermediate temperature embrittlement in high purity nickel and binary nickel-bismuth alloy — •Lei Zheng1,2, Reda Chellali2, Dietmar Baiter2, and Guido Schmitz2 — 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 10083, China — 2Institute of Materials physics, University of Muenster, Wilhelm-Klemm-Str. 10, 48149, Muenster, Germany
Intermediate temperature embrittlement (ITE) is a general phenomenon in Ni-based superalloys. Comparisons of existing interpretations given by different authors reveal considerable differences in understanding the mechanism of ITE. To clarify this situation, high purity nickel and binary Ni-Bi alloy were selected as the tested alloys and their tensile tests in the temperature range of room temperature to 850 °C were carried out. It was demonstrated clearly that high purity nickel has no ITE while Ni-Bi alloys show evident one. With the elevation in temperature, elongation after fracture decreases gradually to a minimum around 750 °C and then increases again rapidly. According to the experimental results, it must be concluded that the ITE is an impurity effect.