Berlin 2005 – scientific programme
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M: Metallphysik
M 20: Intermetallische Phasen I
M 20.2: Talk
Saturday, March 5, 2005, 09:30–09:45, TU H2038
Mechanical spectroscopy of high pressure torsion (HPT) deformed Fe3Al based alloys — •T.S. Pavlova1,2, I.S. Golovin2, H.-R. Sinning2, and R.Z. Valiev3 — 1Physics of Metals Department of Tula State University, Lenin ave. 90, Tula, Russia — 2TU Braunschweig, Institut fuer Werkstoffe, Langer Kamp 8, D-38106 Braunschweig — 3Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Russia
The method of mechanical spectroscopy (especially internal friction measurements) is known as an effective tool for studying dislocation behaviour in deformed metals. However, for brittle intermetallic compounds like Fe3Al, a problem is that deformation at room temperature is hardly possible by ordinary methods but requires special techniques like, for instance, high pressure torsion (HPT).
Several internal friction peaks were distinguished in HPT Fe3Al-based alloys. Most of them are analogous to those found in deformed and irradiated pure iron, where they are known to be caused by dislocations. In HPT Fe-Al specimens, these peaks are significantly reduced already by moderate heat treatments, including even the unavoidable tempering during the measurements themselves. It is notable that using these internal friction peaks, earlier stages of annealing processes in HTP materials can be detected than by other methods, which show annealing effects only at higher temperatures. Preliminary interpretations of these peaks will be presented.