Deformation and crystallization processes of a nano-modified alloy droplet proceeding following its impact onto substrate: a modeling study
V.N. Popov, A.N. Cherepanov
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: metal droplet, substrate, aluminum alloy, modification, refractory nanoparticles, heterogeneous nucleation, crystallization, numerical simulation
Abstract
Solidification of a binary aluminum alloy modified with refractory nanoparticles considered as active solid-phase nucleation centers is investigated. A mathematical model for the heterogeneous nucleation and crystallization of the melt is formulated taking into account the hydrodynamic processes in a droplet proceeding during the interaction of the droplet with the solid surface. This thermohydrodynamic problem is studied under conditions of sequential bulk crystallization of the metal. Thermal resistance on the contact surface of the melt with the substrate is taken into account. Regularities of the temperature change, and nucleation and growth, of the solid phase in a solidifying aluminum alloy are described. An estimate of the distribution of crystal-structure dispersity over the splat cross-section is reported.
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