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Regensburg 2004 – wissenschaftliches Programm

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M: Metallphysik

M 25: Mechanische Eigenschaften III

M 25.4: Vortrag

Donnerstag, 11. März 2004, 11:00–11:15, H4

Mechanical Spectroscopy of Fe-Al-Cr, Fe-Al-Si, Fe-Al-Co alloys. — •Alexander Strahl1, Igor S. Golovin2, Tatjana Pavlova3, Heiko Bremers1, Christa Grusewski2, and Hartmut Neuhäuser11TU Braunschweig, Institut für Metallphysik u. Nukleare Festkörperphysik, Mendelssohnstr. 3, D-38106 Braunschweig — 2TU Braunschweig, Institut fuer Werkstoffe, Langer Kamp 8, D-38106 Braunschweig — 3Physics of Metals Department of Tula State University, Tula, Russia

Our investigation of internal friction in binary Fe-Al alloys (see previous abstracts) has been extended to ternary Fe-Al-Cr, Fe-Al-Si, and Fe-Al-Co alloys with a fixed content of substitute atoms in iron: [Fe-(Al,Cr)30, Fe-(Al,Si)25, Fe-(Al,Co)25 at. %]. The idea of studying internal friction in these compositions is based on the opportunity to vary the degree of order in the alloys and the formation of carbides: Si improves D03 order in Fe-Al, Co increases the tendency to the B2 order into Fe-Al, and substitution of Al by Cr decreases the order in Fe-Al and also forms the chromium carbides. The structure of the alloys was carefully examined using X-ray and TEM, the order-disorder transition intervals by DSC measurements. Temperature and amplitude dependent internal friction effects were studied in Hz and kHz ranges of resonance frequency with a heating rate of 1 K/min (the same heating rate was used in DSC measurements).

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