The Physical Foundations of 3D-Printing Technology. Molecular Dynamics Simulation

SY Korostelev and EE Slyadnikov and IY Turchanovsky, RUSSIAN PHYSICS JOURNAL (2023).

DOI: 10.1007/s11182-023-02764-z

Using the molecular dynamics (MD) approach, a nonequilibrium phase transition - nanosystem melting - initiated by a volumetric heat source is studied. It is shown that at a critical heat source power the melting phase transition occurs under nonequilibrium conditions of significant local overheating and may be accompanied by the formation of a locally unstable state in the microcrystal and the complex dynamics: the nucleation of phase transformation fronts both on the surface and in the bulk of the microcrystal. The nanosystem crystallization obtained by modeling the melting is also studied, with the cooling simulated by touching the cold surface. The study provides an insight into the physical processes taking place in nanosystems during their melting and crystallization, which allows formulating the requirements to the heat source parameters depending on the layer thickness built by 3-D printing.

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