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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 Neuhäuser¹ — ¹TU 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).