Regensburg 2004 – scientific programme

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M: Metallphysik

M 25: Mechanische Eigenschaften III

M 25.3: Talk

Thursday, March 11, 2004, 10:45–11:00, H4

Mechanical Spectroscopy of Fe-(0-40at.%)Al alloys. — •Igor S. Golovin¹, Alexander Strahl², Svetlana B. Golovina², Tatjana Pavlova³, and Hartmut Neuhäuser² — ¹TU Braunschweig, Institut fuer Werkstoffe, Langer Kamp 8, D-38106 Braunschweig — ²TU Braunschweig, Institut für Metallphysik u. Nukleare Festkörperphysik, Mendelssohnstr. 3, D-38106 Braunschweig — ³Physics of Metals Department of Tula State University, Tula, Russia

Iron-Aluminium alloys in ordered and quasi disordered states have been investigated after various thermal (quenching, annealing) and mechanical (cold work) treatments to find out the origin of a few internal friction peaks observed. As main instrumentation the vibrating-reed technique with simple beam and an tuning-fork shaped specimen and inverted torsion pendulum were used. The aluminium concentration was varied from 6 up to 40 at. %. The temperature and amplitude dependence of damping and of Young’s modulus has been measured, during heating / cooling cycles between 80 and 920 K. Various damping peaks including the Snoek-type peak (S peak), X peak, Zener (Z) peak and a low temperature dislocation-related (D) peak have been systematically studied with respect to alloy composition and ordering. The mechanisms of these peaks are discussed. Additional alloying by Cr, Ti, Nb (less than 2 %) was used to distinguish between carbon and vacancy contribution to internal friction.