Molecular dynamics simulations have been used to investigate the thermal response to a gradual temperature rise of Al core/Ni shell unsupported particles with a radius of about 4 nm and different shell thickness. The different melting points permit a clean separation of the Al and Ni solid-to-liquid transition processes, the Al core melting at temperatures at which the Ni shell still has a well defined solid character. The latent volume released by Al at melting gives rise to a considerable tensile strain in the Ni shell. The mechanical response of the latter depends on its thickness. A sudden failure and a consequent fragmentation of the core/shell system is observed at small shell thickness values.

Numerical simulation of the thermal response of Al core/Ni shell nanometer-sized particles

DELOGU, FRANCESCO
2007

Abstract

Molecular dynamics simulations have been used to investigate the thermal response to a gradual temperature rise of Al core/Ni shell unsupported particles with a radius of about 4 nm and different shell thickness. The different melting points permit a clean separation of the Al and Ni solid-to-liquid transition processes, the Al core melting at temperatures at which the Ni shell still has a well defined solid character. The latent volume released by Al at melting gives rise to a considerable tensile strain in the Ni shell. The mechanical response of the latter depends on its thickness. A sudden failure and a consequent fragmentation of the core/shell system is observed at small shell thickness values.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/16172
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