Rapid Multicomponent Alloy Solidification with Allowance for the Local Nonequilibrium and Cross-Diffusion Effectsстатья
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Дата последнего поиска статьи во внешних источниках: 17 апреля 2024 г.
Аннотация:Motivated by the fast development of various additive manufacturing technologies, weconsider a mathematical model of re-solidification of multicomponent metal alloys, which takes placeafter ultrashort (femtosecond) pulse laser melting of a metal surface. The re-solidification occursunder highly nonequilibrium conditions when solutes diffusion in the bulk liquid cannot be describedby the classical diffusion equation of parabolic type (Fick law) but is governed by diffusion equationof hyperbolic type. In addition, the model takes into account diffusive interaction between differentsolutes (nonzero off-diagonal terms of the diffusion matrix). Numerical simulations demonstratethat there are three main re-solidification regimes, namely, purely diffusion-controlled with solutepartition at the interface, partly diffusion-controlled with weak partition, and purely diffusionlessand partitionless. The type of the regime governs the final composition of the re-solidified material,and, hence, may serve as one of the main tools to design materials with desirable properties. Thisimplies that the model is expected to be useful in evaluating the most effective re-solidification regimeto guide the optimization of additive manufacturing processing parameters and alloys design.