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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