Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 25: Poster Session

MM 25.13: Poster

Mittwoch, 29. März 2006, 15:30–17:30, P4

Tomographic atom probe (TAP) study of the chemical ordering in bulk amorphous alloys — •A. Shariq¹, T. Al-Kassab¹, R. Kirchheim¹, D.J. Safarik², and R.B. Schwarz² — ¹Institut für Materialphysik, Friedrich Hund Platz 1, D-37077, Göttingen, Germany — ²Los Alamos National Laboratory, MST Division, Structural Property relation group, Los Alamos, NM 87545, USA

Amorphous alloys are characterized by the absence of atomic long range order and reveal only topological and sometimes chemical short range order. The wider supercooled liquid region in new amorphous alloys allows to explore the kinetics and thermodynamics in this region. In this study Pd based amorphous alloys are investigated using the TAP. 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. A new algorithm has been developed, which enables to extract information from the TAP data. The reconstructed volume has been used to elucidate the atomic distance between neighbouring atoms. Pd40,5Cu40,5P19 bulk amorphous alloy are produced as 2 mm diameter rod with the length of almost 46mm. The chemical ordering parameters elucidated by this algorithm for this Pd based amorphous alloys are discussed in this contribution.