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Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Poster session I

MM 22.9: Poster

Montag, 20. März 2017, 19:00–20:00, P4

Melting and solidification behavior of In nanoparticles embedded in crystalline Al and amorphous AlYFe — •Mark Stringe, Martin Peterlechner, Harald Rösner, Christian Simon, and Gerhard Wilde — Institut für Materialphysik, WWU Münster

A reduction of the sample dimension to the nanoscale typically causes a reduction in thermal stability due to an increasing relevance of the surface contribution to Gibbs free energy. Free standing metallic nanoparticles show a melting point depression [1] whereas coherently embedded nanoparticles show an increase in transformation temperatures.

In the present work In nanoparticles are embedded in different matrices using the melt-spinning technique. The thermal behavior of these particles is analyzed using calorimetric measurements. Structural analysis is performed via transmission electron microscopy.

Focusing on the influence of interfaces between particle and matrix, nanoparticles are embedded in both an amorphous phase showing no coherent interfaces and a crystalline matrix showing (semi-)coherent interfaces. By systematic variation of cooling rates the amount of undercooling is deduced to obtain the activation energy for crystal nucleation. Nanoparticles embedded in the amorphous phase behave more like free standing nanoparticles showing a larger undercooling than nanoparticles embedded in a crystalline phase.

[1] Buffat P, Borel J-P. Phys Rev A 13, 2287 (1976)

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