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Phase-Field Modeling of Rapid Solidi...

Najafizadeh, Nima,

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Phase-Field Modeling of Rapid Solidification Processes /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Phase-Field Modeling of Rapid Solidification Processes // Nima Najafizadeh.
作者:	Najafizadeh, Nima,
面頁冊數:	1 electronic resource (106 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-08, Section: B.
Contained By:	Dissertations Abstracts International86-08B.
標題:	Materials science. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31632930
ISBN:	9798302883919

Phase-Field Modeling of Rapid Solidification Processes /
Najafizadeh, Nima,

Phase-Field Modeling of Rapid Solidification Processes /Nima Najafizadeh. - 1 electronic resource (106 pages)

Source: Dissertations Abstracts International, Volume: 86-08, Section: B.

Many advanced manufacturing processes such as additive manufacturing utilize rapid solidification of alloys, as it enables the formation of exotic non-equilibrium microstructure and thus improved properties. However, the interrelationship between the processing parameters and the resulting microstructure in rapid solidification is yet to be fully understood. We aim to investigate the microstructure evolutions during the rapid solidifications using phase-field modeling. The phase-field method assumes a diffuse interface, which avoids tracking the moving interface and hence enables efficient numerical simulations for complex microstructure evolution. A phase-field model with coupled solute-thermal diffusion and solute trapping effect is developed to investigate the rapid solidification of alloys. First a one-dimensional version is applied to investigate additive manufacturing and melt spinning. The variation of key variables of the solid-liquid interface throughout the rapid solidification of both processes are analyzed. It is found that the onset of nucleation determines the selection of solidification pathways and consequently the evolution of temperature and interface velocity. To capture the complex solidification patterns and morphologies that cannot be fully described in one dimension, a two-dimensional (2D) phase-field model is developed using domain decomposition method to leverage the capabilities of parallel computing. This model can be employed to simulate anisotropic growth patterns like columnar, and cellular/dendritic morphologies. The impact of thermal diffusion on the rapid solidification of a dilute alloy is examined through the study of isothermal holding and continuous cooling conditions. The results demonstrate that the effect of thermal diffusion depends strongly on the growth velocity.

English

ISBN: 9798302883919Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

Additive manufacturing

Phase-Field Modeling of Rapid Solidification Processes /
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520 $a Many advanced manufacturing processes such as additive manufacturing utilize rapid solidification of alloys, as it enables the formation of exotic non-equilibrium microstructure and thus improved properties. However, the interrelationship between the processing parameters and the resulting microstructure in rapid solidification is yet to be fully understood. We aim to investigate the microstructure evolutions during the rapid solidifications using phase-field modeling. The phase-field method assumes a diffuse interface, which avoids tracking the moving interface and hence enables efficient numerical simulations for complex microstructure evolution. A phase-field model with coupled solute-thermal diffusion and solute trapping effect is developed to investigate the rapid solidification of alloys. First a one-dimensional version is applied to investigate additive manufacturing and melt spinning. The variation of key variables of the solid-liquid interface throughout the rapid solidification of both processes are analyzed. It is found that the onset of nucleation determines the selection of solidification pathways and consequently the evolution of temperature and interface velocity. To capture the complex solidification patterns and morphologies that cannot be fully described in one dimension, a two-dimensional (2D) phase-field model is developed using domain decomposition method to leverage the capabilities of parallel computing. This model can be employed to simulate anisotropic growth patterns like columnar, and cellular/dendritic morphologies. The impact of thermal diffusion on the rapid solidification of a dilute alloy is examined through the study of isothermal holding and continuous cooling conditions. The results demonstrate that the effect of thermal diffusion depends strongly on the growth velocity.
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653 $a Melt spinning
653 $a Parallel computation
653 $a Phase field
653 $a Rapid solidification
690 $a 0794
690 $a 0488
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