Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 52: Nanomaterials III: Nanoporous Gold and Phase Transformations

MM 52.6: Vortrag

Donnerstag, 19. März 2015, 13:00–13:15, H 0106

MORPHOLOGY AND PHASE TRANSFORMATION OF INDIUM NANOPARTICLES EMBEDDED IN AN ALUMINUM MATRIX — •Mostafa Mohamed, Martin Peterlecher, and Gerhard Wilde — Institute of Materials Physics, Münster, Germany

The melting , undercooling, and superheating of In- nanoparticles embedded in an Al matrix have been studied as a function of particle size by differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Different densities of nanometer-sized In particles that were uniformly embedded in an Al-matrix have been synthesized by rapid melt quenching. After systematic thermal treatments, a portion of the In-particles showed an increase of the melting temperature compared to the bulk behavior. Analyses of DSC measurements and TEM images were carried out to analyze the impact of the interfaces between nanoparticles and matrix as well as of pressure effects on the melting/freezing phase transformation. The properties of embedded and grain boundary particles are also discussed.