Berlin 2005 – wissenschaftliches Programm

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M: Metallphysik

M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)

M 32.38: Poster

Montag, 7. März 2005, 14:30–16:30, Poster TU B

Tomographic atom probe (TAP) study of the chemical ordering in amorphous alloys — •Ahmed Shariq, Talaat Al-Kassab, and Reiner Kirchheim — Institut für Materialphysik, Friedrich hund platz 1,D 37077, Göttingen, Germany

Amorphous alloys are characterized by the absence of atomic long range order and reveal only topological and sometimes chemical short range order. The attractive properties offered by these alloys triggered intensive microstructural investigations in the last few years. The wider supercooled liquid region in new amorphous alloys allows to explore the kinetics and thermodynamics in this region. Atomic scale chemical ordering in such alloys put great demands on the characterizing techniques. The 3D-tomographic atom probe (TAP) is proved to be currently the best experimental tool to gain information on chemical heterogeneities at the atomic scale. The data from TAP has been used to elucidate the atomic distance between neighbouring atoms. The chemical ordering in the Fe, Pd and Zr based amorphous alloys are discussed in this contribution.