Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 57: Microstructure and Phase Transformations - transformation kinetics

MM 57.4: Vortrag

Donnerstag, 23. März 2017, 11:00–11:15, IFW B

Analysis of the melting and solidification behavior of Pb nanoparticles embedded in Al matrix with Ga addition — •Martin Peterlechner, Harald Rösner, and Gerhard Wilde — Institute of Materials Physics, WWU Münster, Germany

Melting and crystallization solidification of nanoparticles are of academic interest due to size effects. Nanoparticles embedded in a matrix show contributions to their melting behavior caused by the coherency of the interfaces and pressure of the matrix. In the present study, nanoparticles of the low melting point material Pb was were processed as nanoparticles embedded in an coarse grained Al matrix where with Ga contents up to 9 at% was addedin order to vary the misfit and thus the coherency of the interfaces. The embedded nanoparticles show a decreasing melting and solidification temperatures with increasing Ga contents, due to an atomistically flat decoupling wetting layer at the Al-Pb interface. In the present work, the Transmission electron microscopy (TEM) analysis is supported by multislice image simulations, showing a signal broadening of the TEM analysis at the interface. A reduced melting enthalpy is in agreement with a the observed layering effect. The results are discussed with respect to current models. reducing the effective volume of the melting species.

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