Regensburg 2002 – wissenschaftliches Programm

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M: Metallphysik

M 7: Amorphe und metastabile Metalle II

M 7.3: Fachvortrag

Montag, 11. März 2002, 16:30–16:45, H4

Absence of autodispersion in Fe₄₀Ni₃₈Mo₄B₁₈ metallic glass — •Sabine Lenser¹, Volker Zöllmer¹, Jörn Erichsen¹, Sundar Daniel¹, Klaus Rätzke¹, Shigehito Deki² und Franz Faupel¹ — ¹Technische Fakultät der Christian-Albrechts-Universität zu Kiel, Lehrstuhl für Materialverbunde, Kaiserstr. 2, D-24143 Kiel — ²Department of Chemistry, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Higashinada, Kobe 658-8501, Japan

The effect of auto-dispersion of noble metals is well known for polymers and is characterised by a large penetration of the diffuser into the matrix assisted by crystallisation of the matrix. This phenomenon is different from the usual diffusion behaviour [1]. Recently, for the first time, auto-dispersion of gold was observed in a commercial metallic glass [2]. Here the dispersion behaviour of silver was studied in the same glass by means of the radio-tracer ¹¹⁰Ag. For comparison radio-active ⁵⁷Co was also evaporated on the metallic glass surface and annealed in the temperature range of 650 to 820 K under vacuum until crystallisation. This is followed by sputtering with Argon ions to obtain the tracer depth profile. While cobalt was found to diffuse, silver did not diffuse or reveal a depth profile typical of auto-dispersion which could be due to the low solubility.

[1] T. Noguchi, S. Mukrakami, K. Gotoh, Y. Yamaguchi, S. Deki, J. Mater. Sci. Lett. 10 (1991) 477.

[2] S. Deki, Kobe University Japan, private communication, 2001.