Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 58: Nanomaterials I

MM 58.1: Vortrag

Donnerstag, 23. März 2017, 10:15–10:30, IFW D

Factors Influencing Melting and Solidification of In-Nanoparticles Embedded in an Al-matrix — •Mostafa Mohamed, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics,Münster,Germany

Nano-crystalline Indium particles embedded in an Al-matrix are synthesized by rapid solidification. Calorimetry and electron microscopy was utilized to study the melting and solidification of In-nanoparticles with a diameter between 20-350 nm. The volume strains accompanying the transformation are accommodated partially by generation of dislocations and missing wedges of the nanoparticles. Thermal cycling leads to a reduction of the maximum overheating temperature, and an increase of the minimal solidification temperature. The three effects which can affect the equilibrium melting temperature of In-nanoparticles, change in volume during melting, differential thermal expansion of the nanoparticles and the matrix capillarity effect are discussed.