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Melting and Solidification of in Nanoparticles Embedded in an Al-Matrix: Stability and Metastability Under Confinement Conditions

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Document pages: 34 pages

Abstract: Nano-crystalline Indium (In) particles embedded in an Al-matrix were synthesized by rapid solidification. Calorimetry and electron microscopy were utilized to study the melting and solidification of In nanoparticles with sizes between 20-350 nm. The volume strains accompanying the transformation are accommodated by generation of dislocations and missing wedges at the nanoparticle - matrix interface. Thermal cycling leads to a reduction of the maximum overheating temperature and an increase of the minimal solidification temperature. The results concerning the thermal cycling behavior indicate that the degree of superheating or melting point decrease is dictated by a complex interplay between coherency and misfit at the particle-matrix interfaces and the relative stability of different crystalline phases. In addition the results indicate the possibility for a coherency-induced reversal between stable (tetragonal) and metastable (cubic) In phase inside the nanoscale Al confinement.

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