Abstract
Combining the Gupta potential and bond order analysis in a molecular dynamics simulation, a martensitic transformation is observed in the 147-atom AucoreAgshell nanostructure at 328K. The response time for this transformation is about 7ps at 350K. In pure gold clusters, it was previously thought that a similar solid-to-solid transformation is a prelude to melting transitions. In the present case, atomic pathway snapshots show that the heating energy is used to overcome the energy barrier for initiating the spontaneous process. The subsequent twist-deformation propagation and termination are clearly observed.
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