Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 40: Nanomaterials III

MM 40.3: Vortrag

Donnerstag, 17. März 2011, 16:45–17:00, IFW B

Melting of faceted Pb nanoparticles — •Anna Moros, Harald Rösner, and Gerhard Wilde — Westfälische Wilhelms-Universität Münster, Institut für Materialphysik, Wilhelm-Klemm-Straße 10, 48149 Münster

Melting of confined and nanometer-sized Pb inclusions embedded in a polycrystalline aluminum matrix has been intensively investigated in order to utilize the experimental results obtained on this model system for clarifying the relevance of different models that describe the size dependence of reversible phase transformations. Yet, this phenomenon is still not completely understood. For this reason a study of the melting behaviour of nanometer-sized and faceted Pb particles embedded in an Al matrix based on calorimetry and transmission electron microscopy has been performed. The size distribution of the Pb inclusions was obtained and utilized for the deconvolution of the contributions of different size classes to the total melting signal. Detailed calorimetric analyses revealed that faceted Pb particles melt at elevated temperatures but have reduced melting enthalpy compared to the bulk material. The related thermodynamic consequences are critically discussed.